In Japanese, 「半」 can indicate 30 minutes past the hour when attached to a clock time. When attached to a unit of time or quantity, it means adding another half of that unit. 「三時半」 means 3:30, while 「三時間半」 means three and a half hours. The two expressions differ by just one character, 「間」, but their meanings are completely different.

To express half of something, Japanese commonly uses 「半分」. For example, 「ケーキの半分」 means half of a cake. Similarly, 「一年半」 means one year and six months, whereas 「半年」 means only six months. Although these expressions look similar, choosing the correct one depends on whether the sentence refers to a clock time, a duration, or a portion of food or another object.

How to Use 「半」 in Japanese: Understanding Clock Times, Durations, and Quantities

The Japanese word 「半（はん）」 means half, but its specific meaning changes depending on the unit that comes before it. When attached to a clock time, it indicates 30 minutes past the hour. For example, 「三時半」 means 3:30. When attached to a unit of time or quantity, it means adding another half of that unit. For instance, 「三時間半」 means three and a half hours, while 「一年半」 means one year and six months.

The distinction most likely to cause confusion is the difference between a point in time and a duration. 「三時半」 answers the question "What time?", while 「三時間半」 answers "How long?" The two cannot be used interchangeably. To express half of a whole, Japanese commonly uses 「半分（はんぶん）」. For example, 「ケーキの半分」 refers to half of a cake, while 「半分に切る」 means to cut something into two halves.

When you encounter 「半」, it therefore helps to determine whether the sentence is stating a clock time, calculating a duration, or describing a quantity. 「午後三時半に会う」 specifies a meeting time, 「一時間半待つ」 describes how long someone waits, and 「ご飯を半分にする」 means reducing a serving of rice to half its original amount. Although all these meanings involve "half," Japanese uses different constructions depending on what is being expressed.

• Example: 会議は午後三時半に始まります。
  Kana: かいぎはごごさんじはんにはじまります。
  Translation: The meeting starts at 3:30 p.m.
  「三時半」 means 3:30, and adding 「午後」 makes it clear that the time is in the afternoon. Because 「半」 already includes the meaning of 30 minutes, there is no need to add 「分」.
• Example: 空港まで一時間半かかります。
  Kana: くうこうまでいちじかんはんかかります。
  Translation: It takes an hour and a half to get to the airport.
  「一時間半」 means one hour plus another half hour, or 90 minutes. Because this sentence describes travel time, it uses 「時間半」. You cannot omit 「間」 and write 「一時半」.
• Example: ケーキの半分を食べました。
  Kana: ケーキのはんぶんをたべました。
  Translation: I ate half of the cake.
  「半分」 means one-half of a whole, so 「ケーキの半分」 refers to half of one cake. Changing the sentence to 「ケーキを一個半食べました」 would mean eating one and a half cakes, which is a different quantity.

Japanese 「半」 Attachment Patterns: Clock Times, Durations, and 「半分」

In Japanese, 「半（はん）」 generally follows a unit of time or quantity that includes a number. The basic pattern is "number + unit + 半." Examples include 「三時半」, 「一時間半」, 「一年半」, and 「一個半」. In each case, the number and unit come first, followed by 「半」. However, 「半」 cannot be attached directly to every noun. An appropriate measurable unit is usually required.

「半分（はんぶん）」 follows a different pattern. To identify half of something, you can use "noun + の + 半分," as in 「ケーキの半分」. Particles are then added according to the action in the sentence. For example, 「半分を食べる」 means to eat half, while 「半分に切る」 means to cut something in half. 「半分」 can also appear directly before a verb, as in 「仕事は半分終わりました」, without a particle between them.

Type	Attachment pattern	Example	Important note
Clock time	Number + 時 + 「半」	三時半	「半」 follows 「時」; there is no need to add 「分」
Duration	Number + 時間／年／か月 + 「半」	一時間半、一年半	State the full number of units first, then add another half unit
Quantity	Number + counter + 「半」	一個半、一杯半	Use a counter suitable for expressing half of the unit
Half of a specified whole	Noun + の + 「半分」	ケーキの半分	「の」 connects the whole to one of its halves
「半分」 as an object	「半分」 + を + verb	半分を食べる	「を」 marks the object of the action
「半分」 as the result of an action	「半分」 + に + verb	半分に切る	「に」 indicates the resulting state
「半分」 expressing degree or amount	「半分」 + verb	半分終わる	It can modify the verb directly; a particle is not always necessary

「半」 Attachment Pattern ① | For Clock Times, Use "Number + 時 + 半"

To express half past an hour, use the pattern "number + 時 + 半," as in 「三時半」, 「四時半」, or 「七時半」. 「半」 must appear after 「時」 and already contains the meaning of 30 minutes. Therefore, you cannot write 「三時半分」 or place 「半」 between the number and 「時」.

If the sentence also specifies a starting time, ending time, or appointment, particles such as 「に」, 「から」, and 「まで」 can follow 「三時半」. These particles attach to the complete time expression without changing the order of "number + 時 + 半."

• Example: 三時半に集合してください。
  Kana: さんじはんにしゅうごうしてください。
  Translation: Please gather at 3:30.
  「三時半」 is formed by combining 「三 + 時 + 半」. The particle 「に」 then marks the time of the gathering. 「半」 cannot be moved before 「時」.
• Example: 会議は午後四時半から始まります。
  Kana: かいぎはごごよじはんからはじまります。
  Translation: The meeting starts at 4:30 p.m.
  「午後」 comes before the entire time expression, while 「から」 follows 「四時半」. Adding an expression for morning or afternoon does not change the order of 「時 + 半」.
• Example: 七時半まで待ちます。
  Kana: しちじはんまでまちます。
  Translation: I'll wait until 7:30.
  「まで」 follows 「七時半」 directly and indicates when the waiting ends. It attaches to the complete time expression, not merely to the character 「半」.

「半」 Attachment Pattern ② | For Durations and Quantities, Use "Number + Unit + 半"

The pattern "number + unit + 半" also applies to expressions such as one and a half hours, one and a half years, and one and a half items. The unit may indicate a duration, such as 「時間」 or 「年」, or it may be a counter, such as 「個」 or 「杯」. Expressions including 「一時間半」, 「一年半」, and 「一個半」 all place 「半」 after the complete unit.

Pay particular attention to where the unit appears. You cannot omit 「間」 from 「一時間半」 and write 「一時半」, because 「一時半」 means 1:30. Also, 「一年半」 follows the pattern 「一 + 年 + 半」, whereas 「半年」, meaning six months, is a fixed expression. Not every time unit can be combined using the pattern "半 + unit." To express half an hour, Japanese speakers generally say 「三十分」 in everyday conversation.

• Example: 空港まで一時間半かかります。
  Kana: くうこうまでいちじかんはんかかります。
  Translation: It takes an hour and a half to get to the airport.
  「一時間半」 follows the structure 「一 + 時間 + 半」. 「半」 comes after the complete unit 「時間」. You cannot omit 「間」 or write 「一時間半分」.
• Example: 日本に一年半住んでいました。
  Kana: にほんにいちねんはんすんでいました。
  Translation: I lived in Japan for a year and a half.
  「一年半」 follows the pattern 「一 + 年 + 半」 and means one year plus another six months. 「半」 attaches directly to 「年」, with no particle required between them.
• Example: ケーキを一個半食べました。
  Kana: ケーキをいっこはんたべました。
  Translation: I ate one and a half cakes.
  「一個半」 is formed from 「一 + 個 + 半」. 「半」 follows the counter 「個」 rather than attaching directly to 「ケーキ」. This construction is suitable when expressing a whole number of units plus another half unit.

「半分」 Attachment Pattern ③ | "Noun + の + 半分" and the Particles 「を」 and 「に」

「半分」 is itself a noun meaning one-half, so it does not need to follow a number and unit in the way that 「半」 does. To specify what something is half of, use "noun + の + 半分," as in 「ケーキの半分」 or 「りんごの半分」. Here, 「の」 connects the whole with the portion being described.

Different particles can follow 「半分」 depending on the verb. In 「半分を食べる」, 「を」 marks the portion being eaten. In 「半分に切る」, 「に」 indicates the result of cutting. If the sentence simply states how much work has been completed or how much food has been eaten, 「半分」 may appear directly before the verb, as in 「半分終わる」 or 「半分食べる」. A particle such as 「を」 or 「に」 is not always necessary.

• Example: ケーキの半分を食べました。
  Kana: ケーキのはんぶんをたべました。
  Translation: I ate half of the cake.
  「ケーキ + の + 半分」 identifies half of the cake, while 「を」 marks the portion being eaten. You cannot attach 「半」 directly to 「ケーキ」 and write 「ケーキ半を食べました」.
• Example: りんごを半分に切ってください。
  Kana: りんごをはんぶんにきってください。
  Translation: Please cut the apple in half.
  This sentence follows the pattern "noun + を + 半分 + に + 切る." 「りんごを」 marks the item being cut, while 「半分に」 indicates the resulting state. Therefore, 「に」 is used here rather than 「を」.
• Example: 仕事は半分終わりました。
  Kana: しごとははんぶんおわりました。
  Translation: Half of the work is finished.
  「半分」 appears directly before 「終わりました」 to indicate the degree of completion, with no particle between them. This also shows that 「半分」 is not limited to constructions involving "noun + の"; it can directly describe the progress of an action.

Japanese 「半」: Uses for Clock Times, Durations, Quantities, and 「半分」

「半」 Usage ① | Expressing 30 Minutes Past the Hour

One of the most common uses of 「半」 in Japanese is to indicate 30 minutes past the hour. For example, 「三時半」 means 3:30, and 「七時半」 means 7:30. This usage answers questions involving 「何時（なんじ）」, or "what time," and often appears in everyday situations involving appointments, transportation schedules, and business hours.

「半」 itself does not distinguish between morning and afternoon. Therefore, 「三時半」 could mean 3:30 a.m. or 3:30 p.m. If the time of day needs to be made clear, add 「午前」 or 「午後」. When arranging meetings, making reservations, or confirming transportation schedules, speakers generally specify the time of day as well.

• Example: 会議は午後三時半に始まります。
  Kana: かいぎはごごさんじはんにはじまります。
  Translation: The meeting starts at 3:30 p.m.
  「午後三時半」 clearly specifies 3:30 in the afternoon. It can be used to announce the starting time of a meeting, event, or other scheduled activity.
• Example: 明日は七時半に駅で会いましょう。
  Kana: あしたはしちじはんにえきであいましょう。
  Translation: Let's meet at the station at 7:30 tomorrow.
  「七時半」 specifies the meeting time. The sentence does not indicate whether it is morning or evening, so 「午前」 or 「午後」 can be added if the time of day has not yet been confirmed.
• Example: この店は午前十時半に開きます。
  Kana: このみせはごぜんじゅうじはんにあきます。
  Translation: This shop opens at 10:30 a.m.
  「十時半」 means 10:30, while 「午前」 specifies that the time is in the morning. This expression is often used when describing the opening hours of shops, restaurants, or facilities.

「半」 Usage ② | Adding Half of a Time Unit to a Duration

「半」 can also express the length of a period. For example, 「一時間半」 means one and a half hours, 「一年半」 means one year and six months, and 「三か月半」 means three and a half months. In this usage, 「半」 does not necessarily represent 30 minutes. Its value depends on the time unit that comes before it.

This usage generally answers questions such as 「何時間（なんじかん）」, meaning "how many hours," or 「どのくらい」, meaning "how long." It commonly appears when discussing travel times, periods of residence, working hours, or the duration of activities. Although 「三時半」 and 「三時間半」 differ by only one character, 「間」, the former means 3:30 and the latter means three and a half hours. They cannot be used interchangeably.

• Example: 空港まで一時間半かかります。
  Kana: くうこうまでいちじかんはんかかります。
  Translation: It takes an hour and a half to get to the airport.
  「一時間半」 means one hour plus another 30 minutes, for a total of 90 minutes. Here, it is combined with 「かかります」 to describe the time required, without specifying when someone will arrive at the airport.
• Example: 日本に一年半住んでいました。
  Kana: にほんにいちねんはんすんでいました。
  Translation: I lived in Japan for a year and a half.
  「一年半」 means one year plus six months, or 18 months. If the period of residence was only six months, 「半年」 should be used instead. The two expressions indicate different lengths of time.
• Example: 工事は三か月半続きました。
  Kana: こうじはさんかげつはんつづきました。
  Translation: The construction work continued for three and a half months.
  「三か月半」 means three months plus another half month. It is commonly used to describe how long construction projects, plans, or other activities continue. The half month in this expression cannot be treated as a fixed period of 30 minutes.

「半」 Usage ③ | Adding Another Half Unit to a Whole Quantity

Besides time, 「半」 can follow units of quantity to indicate an additional half unit after a whole number of units. For example, 「一個半」 means one and a half items, 「一杯半」 means one and a half cups, and 「二メートル半」 means two and a half meters.

This usage is common when describing food portions, drink quantities, lengths, and other measurable things. One important distinction is that 「一個半」 represents 1.5 units, while 「半分」 represents only half of a particular whole. If someone says 「ケーキを一個半食べました」, the amount eaten is greater than in 「ケーキの半分を食べました」.

• Example: ケーキを一個半食べました。
  Kana: ケーキをいっこはんたべました。
  Translation: I ate one and a half cakes.
  「一個半」 represents one whole cake plus another half cake, totaling 1.5 cakes. The sentence counts the quantity eaten rather than describing someone taking only half of one cake.
• Example: コーヒーを一杯半飲みました。
  Kana: コーヒーをいっぱいはんのみました。
  Translation: I drank one and a half cups of coffee.
  「一杯半」 means one cup plus another half cup. It is suitable for describing drinks and other quantities measured in cups. Here, 「半」 refers to half a cup, not half a liter.
• Example: 布を二メートル半買いました。
  Kana: ぬのをにメートルはんかいました。
  Translation: I bought two and a half meters of fabric.
  「二メートル半」 means two meters plus another half meter, totaling 2.5 meters. In addition to food and drinks, 「半」 can also be used with measurement units such as length.

「半分」 Usage ④ | Expressing One-Half of a Whole

「半分」 refers to one-half of a whole. It can describe food, objects, money, groups of people, or a total quantity. Unlike 「一個半」 or 「一杯半」, 「半分」 requires a whole that serves as a reference point to determine how much "half" actually represents.

For example, 「ケーキの半分」 means half of a cake, while 「お金の半分」 means half of a particular amount of money. The item does not have to be physically cut into two pieces. As long as the expression describes half of a whole, 「半分」 can be used.

• Example: ケーキの半分を弟にあげました。
  Kana: ケーキのはんぶんをおとうとにあげました。
  Translation: I gave half of the cake to my younger brother.
  「ケーキの半分」 takes the whole cake as its reference and indicates one-half of it. The sentence specifies how much was given away; it does not mean that an additional half cake was added.
• Example: 参加者の半分が学生です。
  Kana: さんかしゃのはんぶんががくせいです。
  Translation: Half of the participants are students.
  「半分」 can also describe a proportion of people. For example, if there are 20 participants and 10 of them are students, this expression can be used. Its usage is not limited to food or physical objects.
• Example: お金の半分を貯金しました。
  Kana: おかねのはんぶんをちょきんしました。
  Translation: I saved half of the money.
  「お金の半分」 means one-half of a particular sum of money. The actual amount depends on how much money there was originally. Here, 「半分」 describes a proportion rather than a fixed amount.

「半分」 Usage ⑤ | Cutting Something in Half or Reducing a Quantity by Half

「半分」 is also commonly used with verbs such as 「切る」, 「分ける」, 「減らす」, and 「する」 to express dividing something into two halves or reducing a quantity to half its original amount. For example, 「半分に切る」 means to cut something in half, while 「半分に減らす」 means to reduce a quantity to one-half of its original value.

This usage differs slightly from simply identifying half of something. It generally describes the result of an action, such as food being cut, a serving of rice being reduced, or an original quantity being adjusted. When ordering at a Japanese restaurant, you can say 「半分にしてください」 if you want the staff to reduce your rice portion.

• Example: りんごを半分に切ってください。
  Kana: りんごをはんぶんにきってください。
  Translation: Please cut the apple in half.
  「半分に切る」 means to cut one item into two equally sized parts. Here, 「半分」 describes the result of cutting and is suitable for items that can be divided, such as fruit or cake.
• Example: ご飯を半分にしてください。
  Kana: ごはんをはんぶんにしてください。
  Translation: Please reduce the rice portion to half its usual size.
  「半分にする」 means adjusting an original quantity to half its amount. This expression can be used when asking for less rice at a restaurant, although whether the portion can be adjusted depends on how the establishment serves its food.
• Example: 砂糖の量を半分に減らしました。
  Kana: さとうのりょうをはんぶんにへらしました。
  Translation: I reduced the amount of sugar by half.
  「半分に減らす」 means reducing a quantity to one-half of its original amount. For example, if the original recipe called for 100 grams of sugar and the amount was reduced to 50 grams, this expression would apply.

「半分」 Usage ⑥ | Describing Work, Reading, or Preparation That Is Half Complete

「半分」 can also describe how far an activity has progressed. For example, 「仕事は半分終わりました」 means half the work is finished, while 「本を半分読みました」 means half the book has been read. In these cases, no physical object is being cut. Instead, the entire task or the contents of a book are treated as a whole, and 「半分」 indicates the proportion completed so far.

To express that only half the task is complete and the rest remains unfinished, you can combine 「半分」 with expressions such as 「まだ」 or 「しか〜ない」. If you are simply reporting current progress, 「半分終わりました」 or 「半分読みました」 is sufficient. This usage is particularly useful when discussing work progress, assignment completion, or reading progress.

• Example: 仕事は半分終わりました。
  Kana: しごとははんぶんおわりました。
  Translation: Half of the work is finished.
  「半分」 indicates the proportion of work that has been completed, with roughly the other half still remaining. No physical item is divided into two parts here; the expression describes progress toward completing the entire task.
• Example: この本は半分まで読みました。
  Kana: このほんははんぶんまでよみました。
  Translation: I've read halfway through this book.
  「半分まで」 indicates that reading progress has reached the middle of the book. For example, if a book has 200 pages and someone has read approximately 100 pages, this expression can be used.
• Example: 準備はまだ半分しかできていません。
  Kana: じゅんびはまだはんぶんしかできていません。
  Translation: Only half of the preparations are finished so far.
  「半分しか〜ない」 emphasizes that only half the preparations have been completed and the remaining portion is not yet ready. Compared with simply saying 「半分終わりました」, this sentence more strongly conveys that the work is still incomplete.

「三時半」 vs. 「三時間半」 vs. 「半分」: A Clock Time, a Duration, and Half of a Whole

The Japanese expressions 「三時半」, 「三時間半」, and 「半分」 all contain 「半」, but they express different meanings. 「三時半」 is a point on the clock, meaning 3:30. 「三時間半」 describes a duration of three and a half hours. 「半分」 refers to one-half of a whole and can describe food portions, quantities, or the degree of completion.

Similarly, 「一年半」 and 「半年」 cannot be used interchangeably. The former means one year plus another six months, while the latter means only six months. The distinction between 「半分」 and 「一個半」 is whether the expression refers to half of an existing whole or to an additional half unit beyond a whole number. These expressions do not differ in formality or conversational tone. Their main differences lie in the units being counted and what the sentence is intended to convey.

Comparison	「三時半」	「三時間半」	「半分」
Basic meaning	3:30	Three and a half hours	One-half of a whole
Kana	さんじはん	さんじかんはん	はんぶん
Main function	Indicates a clock time	Indicates a duration	Indicates an amount, quantity, or proportion
Question answered	What time?	How long?	How much? What proportion of the whole?
Basis for interpretation	A point on the clock	The period for which an action or state continues	A specific whole used as a reference
Common pattern	Number + 時 + 半	Number + 時間 + 半	Noun + の + 半分
Common combinations	三時半に、三時半から	三時間半かかる、三時間半待つ	半分を食べる、半分に切る
Whether it includes a complete unit	Indicates another half hour after the stated hour	Three hours plus another half hour	Indicates half of the whole
Can it directly indicate a clock time?	Yes	No	No
Can it directly indicate a duration?	No	Yes	Cannot specify a particular duration on its own
Common mistake	Interpreting 「三時半」 as three and a half hours	Omitting 「間」 and turning the expression into a clock time	Interpreting 「半分」 as an additional half unit
Common Traditional Chinese translation	三點半	三個半小時	一半、二分之一
Example	三時半に着きます。	三時間半かかります。	ケーキの半分を食べました。
Example meaning	Arrive at 3:30	Takes three and a half hours	Ate half of the cake

▌「三時半」 vs. 「三時間半」 | Clock Time vs. Duration

「三時半」 and 「三時間半」 differ by just one character, 「間」, but they answer different questions. 「三時半」 means 3:30 and is generally used to indicate when people gather, depart, or arrive. In contrast, 「三時間半」 means three hours plus another 30 minutes and is commonly used to describe travel times, waiting periods, or the length of an activity.

For example, 「三時半に着きます」 means arriving at 3:30, without saying how long the journey takes. 「三時間半かかります」 means that something takes three and a half hours, without indicating the actual arrival time. Therefore, a question using 「何時（なんじ）」, or "what time," can be answered with 「三時半」, while questions using 「何時間（なんじかん）」 or 「どのくらい」 call for a duration expression such as 「三時間半」.

• Example: 電車は午後三時半に着きます。
  Kana: でんしゃはごごさんじはんにつきます。
  Translation: The train arrives at 3:30 p.m.
  「三時半」 identifies the train's arrival time. This expression can be used even if you do not know where the train departed from or how long the journey took.
• Example: 東京まで電車で三時間半かかります。
  Kana: とうきょうまででんしゃでさんじかんはんかかります。
  Translation: It takes three and a half hours to get to Tokyo by train.
  「三時間半」 describes the duration of the train journey. To determine the arrival time, you would also need to know the actual departure time. 「三時間半」 cannot be interpreted directly as an arrival time.

▌「一年半」 vs. 「半年」 | Eighteen Months vs. Six Months

「一年半」 means one complete year plus another six months, totaling 18 months. 「半年」 means only six months. Although both expressions involve the concept of half a year, 「一年半」 already includes 「一年」, meaning one year, and therefore adds another six months to that year.

Both expressions can describe how long someone lives somewhere, works, studies abroad, or participates in another activity. There are no major differences in their appropriate contexts; the distinction is simply their actual duration. 「一年半」 is pronounced 「いちねんはん」. 「半年」 is commonly pronounced 「はんとし」 but may also be pronounced 「はんねん」. To express six months, use 「半年」 without adding 「一年」.

• Example: 日本に一年半住んでいました。
  Kana: にほんにいちねんはんすんでいました。
  Translation: I lived in Japan for a year and a half.
  「一年半」 represents 18 months. The sentence describes a period of residence in Japan lasting more than a year, so it cannot be interpreted as only six months.
• Example: 日本に半年住んでいました。
  Kana: にほんにはんとしすんでいました。
  Translation: I lived in Japan for six months.
  「半年」 represents six months. Compared with the previous example, the place of residence and the action are identical. Only the duration changes from 18 months to six months, so the two expressions cannot be substituted freely.

▌「半分」 vs. 「一個半」 | Half of a Whole vs. One and a Half Units

Both 「半分」 and 「一個半」 can describe quantities of food or objects, but they use different methods of calculation. 「半分」 takes a particular whole as its reference and identifies one-half of it. 「一個半」 represents one whole unit plus another half unit, totaling 1.5 units.

For example, 「ケーキの半分を食べました」 means eating half of one cake. 「ケーキを一個半食べました」 means eating one whole cake plus another half cake. Assuming cakes of the same size, the amount eaten in the second sentence is three times the amount in the first. Neither expression carries a particular emotional tone or level of formality; they simply describe different quantities.

• Example: ケーキの半分を食べました。
  Kana: ケーキのはんぶんをたべました。
  Translation: I ate half of the cake.
  「ケーキの半分」 uses one cake as the whole and indicates one-half of it. The sentence describes eating only a portion of the original cake, without adding any additional cakes.
• Example: ケーキを一個半食べました。
  Kana: ケーキをいっこはんたべました。
  Translation: I ate one and a half cakes.
  「一個半」 means one whole cake plus another half cake, totaling 1.5 cakes. The sentence counts the number of cakes eaten rather than describing what proportion of one particular cake was consumed.

▌Differences in Meaning When Using These Expressions in the Same Situation

Imagine arranging to meet a friend at a café in Japan one afternoon and sharing some cake. In this situation, you could use 「三時半」 to specify the meeting time, 「三時間半」 to describe how long you stayed, and 「半分」 or 「一個半」 to indicate how much cake was eaten.

All four expressions are natural. Their differences are not about how strongly or politely something is said, but about which question the sentence answers. In particular, 「半分」 and 「一個半」 can produce substantially different meanings even with the same verb, because the quantities are calculated differently.

• Example: 午後三時半にカフェで友達と会いました。
  Kana: ごごさんじはんにカフェでともだちとあいました。
  Translation: I met a friend at a café at 3:30 p.m.
  「三時半」 indicates the time of the meeting, specifying that it took place at 3:30 in the afternoon. The sentence does not explain how long they stayed at the café.
• Example: カフェで三時間半過ごしました。
  Kana: カフェでさんじかんはんすごしました。
  Translation: I spent three and a half hours at the café.
  「三時間半」 describes the length of the stay. The sentence does not specify when the person entered the café, only how long they stayed in total.
• Example: ケーキの半分を食べました。
  Kana: ケーキのはんぶんをたべました。
  Translation: I ate half of the cake.
  「半分」 refers to one-half of the original cake. This expression is particularly suitable when sharing a single cake with a friend.
• Example: ケーキを一個半食べました。
  Kana: ケーキをいっこはんたべました。
  Translation: I ate one and a half cakes.
  「一個半」 means that the total quantity eaten was 1.5 cakes. If two equally sized cakes were ordered and someone ate one entire cake plus half of the other, this sentence would apply.

Even within the same café outing, 「三時半」 specifies when something happened, whereas 「三時間半」 describes how long it lasted. 「半分」 indicates half of a particular whole, while 「一個半」 represents a total of 1.5 units. Once you identify whether the sentence concerns a clock time, a duration, or a quantity, you can choose the appropriate expression without confusing them simply because they all contain 「半」.

Practical Japanese 「半」 for Travelers: Confirming Meeting Times and Food Portions

When traveling in Japan, 「半」 frequently appears in conversations about meeting times, transportation durations, and food portions. To confirm when a guided tour begins, you can use 「三時半」 to indicate 3:30. When asking how long a train journey takes, 「一時間半」 expresses one and a half hours. If you want a restaurant to reduce your rice portion, you can use 「半分」, as in 「ご飯を半分にしてください」.

The distinction is that 「半」 after 「時」 indicates 30 minutes past the hour, while 「半」 after 「時間」 adds another half hour to a duration. 「半分」 refers to one-half of a whole. When traveling, it is particularly important to distinguish 「三時半」 from 「三時間半」 so that a departure time is not mistaken for the length of a journey. When requesting an adjustment to a food portion, 「〜していただけますか」 is a more polite way to ask than making a direct demand.

▌Situation ① | Confirming a Tour's Meeting Time at a Tourist Information Counter

A：ツアーは何時に出発しますか。 
　　ツアーはなんじにしゅっぱつしますか。 
　　What time does the tour depart?

B：午後三時半に出発します。 
　　ごごさんじはんにしゅっぱつします。 
　　It departs at 3:30 p.m.

📌 Grammar Point: 「午後三時半」 means 3:30 p.m. 「半」 follows 「時」, so there is no need to add 「分」. The particle 「に」 marks the departure time. Saying only 「三時半」 does not indicate morning or afternoon. Adding 「午前」 or 「午後」 when confirming meeting, departure, or reservation times helps prevent misunderstandings about the time of day.

▌Situation ② | Asking How Long It Takes to Get from a Hotel to the Airport

A：ホテルから空港まで、どのくらいかかりますか。 
　　ホテルからくうこうまで、どのくらいかかりますか。 
　　About how long does it take to get from the hotel to the airport?

B：電車なら、一時間半くらいかかります。 
　　でんしゃなら、いちじかんはんくらいかかります。 
　　If you take the train, it takes about an hour and a half.

📌 Grammar Point: 「一時間半」 means one hour plus another 30 minutes, totaling 90 minutes. 「くらい」 means "approximately" and combines with 「かかります」 to describe the time required for transportation. You cannot omit 「間」 and say 「一時半」, because 「一時半」 means 1:30 and answers "What time?" rather than "How long?" Also, 「電車なら」 establishes taking the train as the condition; it does not mean that other transportation methods take the same amount of time.

▌Situation ③ | Asking Restaurant Staff to Reduce a Rice Portion by Half

A：すみません、ご飯を半分にしていただけますか。 
　　すみません、ごはんをはんぶんにしていただけますか。 
　　Excuse me, could you reduce the rice portion to half its usual amount?

B：はい、かしこまりました。 
　　はい、かしこまりました。 
　　Certainly. Understood.

📌 Grammar Point: 「ご飯を半分にする」 means reducing a serving of rice to half its original amount. 「半分」 is required here and cannot simply be replaced with 「半」. 「〜していただけますか」 is a relatively polite request form, suitable for asking restaurant staff whether they can adjust a portion. If you only want a smaller serving rather than exactly half, you can say 「ご飯を少なめにしていただけますか」. Whether adjustments are possible depends on how the restaurant serves its food.

Additional Usage Notes:

1. Distinguish 「何時」 from 「何時間」 when confirming time. 「何時（なんじ）」 asks what time something happens, as in 「何時に出発しますか」. 「何時間（なんじかん）」 asks how many hours something takes, as in 「何時間かかりますか」. When answering, 「三時半」 means 3:30, while 「三時間半」 means three and a half hours. If someone says only 「三時半」 and it is unclear whether they mean morning or afternoon, you can ask 「午前ですか、午後ですか」 to confirm.
2. 「半分」 for food portions and 「一個半」 for quantities are not interchangeable. 「ケーキの半分」 means half of one cake, while 「ケーキ一個半」 means one whole cake plus another half cake. 「半分」 is commonly used when sharing food at restaurants or asking staff to reduce a portion. When describing how many items were eaten or how many cups were consumed in total, expressions such as 「一個半」 and 「一杯半」 may be used instead. The distinction concerns actual quantities, not politeness.
3. 「半額」 on a menu does not mean the same thing as 「半分」. 「半額（はんがく）」 means half the price. For example, an item originally costing 1,000 yen would cost 500 yen at half price. 「半分（はんぶん）」, on the other hand, means half the portion or quantity. A restaurant offering a half-sized meal does not necessarily charge half the original price. When you see 「半額」, 「半分」, or 「ハーフサイズ」 on a menu, check the price and portion size separately rather than assuming they mean the same thing because they contain 「半」.

Comparing Japanese 「半／半分」 with Korean 「반」

The Japanese 「半（はん）」 and Korean 「반」 can both express the concept of half. Their usage is also quite similar when indicating clock times, calculating durations, or expressing quantities. For example, Japanese 「三時半」 corresponds to Korean 「세 시 반」, and both mean 3:30. Japanese 「一時間半」 corresponds to Korean 「한 시간 반」, and both mean one and a half hours.

However, Japanese distinguishes 「半」 from 「半分」 according to the meaning of the sentence, while Korean 「반」 can directly represent half of a whole. For example, 「사과를 반만 먹었어요」 means that someone ate only half an apple, a meaning Japanese would generally express with 「半分」. Therefore, when comparing Japanese and Korean, first determine whether 「半」 indicates a clock time, a duration, a quantity, or half of an original amount. The same attachment pattern cannot be applied in every situation.

◆ Similar Expression ①: Japanese 「時＋半」 vs. Korean 「시 반」

Japanese 「三時半」 and Korean 「세 시 반」 both mean 3:30. In both languages, the hour comes first, followed by a word expressing half. Japanese attaches 「半」 directly after 「時」, whereas Korean writes 「시 반」 with a space between the two elements.

These expressions are commonly used for meeting times, departures, business hours, and reservations. Both languages can also specify morning or afternoon. For example, Japanese 「午後三時半」 corresponds to Korean 「오후 세 시 반」. In these expressions, 「半／반」 consistently indicates 30 minutes past the hour, rather than a period lasting 30 minutes.

• Example: 세 시 반에 만나요.
  Romanization: se si ban-e man-na-yo.
  Translation: Let's meet at 3:30.
  Japanese: 三時半に会います。
  Kana: さんじはんにあいます。
  Korean 「세 시 반」 and Japanese 「三時半」 both specify the time of a meeting. The particles 「에」 and 「に」 mark the time in their respective languages, but neither sentence says how long the people will stay together afterward.
• Example: 오후 네 시 반에 출발해요.
  Romanization: o-hu ne si ban-e chul-bal-hae-yo.
  Translation: We depart at 4:30 p.m.
  Japanese: 午後四時半に出発します。
  Kana: ごごよじはんにしゅっぱつします。
  Korean 「오후」 corresponds to Japanese 「午後」, and both explicitly indicate the afternoon. Here, 「반」 and 「半」 both represent 30 minutes and are suitable when confirming departure times for transportation or travel itineraries.
• Example: 가게는 일곱 시 반에 열어요.
  Romanization: ga-ge-neun il-gop si ban-e yeo-reo-yo.
  Translation: The shop opens at 7:30.
  Japanese: 店は七時半に開きます。
  Kana: みせはしちじはんにあきます。
  「일곱 시 반」 and 「七時半」 both indicate the time a shop opens. Korean 「열어요」 and Japanese 「開きます」 describe the start of business operations here, without specifying the total length of the shop's opening hours.

◆ Similar Expression ②: Japanese 「時間半／年半」 vs. Korean 「시간 반／년 반」

Japanese 「一時間半」 and Korean 「한 시간 반」 both mean one and a half hours. Likewise, Japanese 「一年半」 and Korean 「일 년 반」 both mean one year and six months. Here, 「半／반」 no longer represents a fixed 30-minute period. Instead, it adds half of the unit that comes before it.

Both languages also distinguish clock times from durations. Japanese 「三時半」 means 3:30, while 「三時間半」 means three and a half hours. Similarly, Korean 「세 시 반」 means 3:30, whereas 「세 시간 반」 means three and a half hours. Japanese 「半年」 can also correspond to Korean 「반년」, although 「6개월」 (six months) is commonly used in everyday Korean. However, one and a half years must be expressed as 「일 년 반」; 「반년」 cannot be substituted.

• Example: 공항까지 한 시간 반 걸려요.
  Romanization: gong-hang-kka-ji han si-gan ban geol-lyeo-yo.
  Translation: It takes an hour and a half to get to the airport.
  Japanese: 空港まで一時間半かかります。
  Kana: くうこうまでいちじかんはんかかります。
  Korean 「한 시간 반」 and Japanese 「一時間半」 both mean 90 minutes. They combine with 「걸리다」 and 「かかる」, respectively, to describe the time required. These constructions are commonly used to ask about travel times, waiting periods, or how long other activities take.
• Example: 여기서 두 시간 반 기다렸어요.
  Romanization: yeo-gi-seo du si-gan ban gi-da-ryeo-sseo-yo.
  Translation: I waited here for two and a half hours.
  Japanese: ここで二時間半待ちました。
  Kana: ここでにじかんはんまちました。
  「두 시간 반」 and 「二時間半」 both mean two hours and 30 minutes. Here, 「반／半」 contributes to the total duration of the wait. The units 「시간／時間」, which indicate a length of time in hours, cannot be omitted because doing so could turn the expression into a reference to a clock time.
• Example: 일본에서 일 년 반 살았어요.
  Romanization: il-bon-e-seo il nyeon ban sa-ra-sseo-yo.
  Translation: I lived in Japan for a year and a half.
  Japanese: 日本に一年半住んでいました。
  Kana: にほんにいちねんはんすんでいました。
  Korean 「일 년 반」 and Japanese 「一年半」 both represent 18 months. If someone lived there for only six months, Korean can use 「반년」 and Japanese can use 「半年」. The difference between these pairs concerns only the duration, not the speaker's emotions or degree of formality.

◆ Similar Expression ③: Japanese 「一個半／一杯半」 vs. Korean 「한 개 반／한 잔 반」

Besides time, Japanese 「半」 and Korean 「반」 can both follow units of quantity to indicate a whole number of units plus another half unit. For example, Japanese 「一個半」 corresponds to Korean 「한 개 반」, while Japanese 「一杯半」 corresponds to Korean 「한 잔 반」. Both languages use these constructions to describe food, drinks, and other measurable quantities.

One point to note is that the counters used in the two languages do not necessarily correspond exactly. When counting cups of coffee, Japanese generally uses 「一杯半」, while Korean uses 「한 잔 반」. Similarly, Japanese expresses two and a half meters as 「二メートル半」, while Korean uses 「두 미터 반」. Although the counters and units differ, the calculation of a whole number of units plus another half unit is very similar.

• Example: 사과를 한 개 반 먹었어요.
  Romanization: sa-gwa-reul han gae ban meo-geo-sseo-yo.
  Translation: I ate one and a half apples.
  Japanese: りんごを一個半食べました。
  Kana: りんごをいっこはんたべました。
  Korean 「한 개 반」 and Japanese 「一個半」 both mean one whole apple plus another half apple. If someone ate only half of one apple, these expressions would not apply. Instead, Korean would use an expression involving 「반」, while Japanese would use 「半分」.
• Example: 커피를 한 잔 반 마셨어요.
  Romanization: keo-pi-reul han jan ban ma-syeo-sseo-yo.
  Translation: I drank one and a half cups of coffee.
  Japanese: コーヒーを一杯半飲みました。
  Kana: コーヒーをいっぱいはんのみました。
  Korean 「한 잔 반」 and Japanese 「一杯半」 both mean one cup plus another half cup. Although Korean uses 「잔」 and Japanese uses 「杯」, 「반／半」 follows the unit of measurement in both languages to indicate an additional half unit.
• Example: 천을 두 미터 반 샀어요.
  Romanization: cheon-eul du mi-teo ban sa-sseo-yo.
  Translation: I bought two and a half meters of fabric.
  Japanese: 布を二メートル半買いました。
  Kana: ぬのをにメートルはんかいました。
  「두 미터 반」 and 「二メートル半」 both mean 2.5 meters. Here, 「반／半」 adds another half meter. This shows that both languages can use the construction for lengths, not just food or time.

◆ Similar Expression ④: Japanese 「半分」 vs. Korean 「반」

Japanese 「半分（はんぶん）」 means one-half of a whole, and Korean 「반」 can directly express the same meaning. For example, the Korean sentence 「사과를 반만 먹었어요」 means that someone ate only half of an apple. In Japanese, this can be expressed as 「りんごを半分だけ食べました」.

This is one of the more noticeable differences between Japanese and Korean. Japanese generally uses 「半分」 when describing half of a food portion, an object, or the progress of a task. Korean, however, can use 「반」 directly, combining it with words such as 「만」, 「으로」, or 「쯤」 to express taking only half, dividing something in two, or referring to approximately half. Japanese has comparable expressions, but words such as 「だけ」, 「に」, and 「くらい」 must be combined according to the intended meaning. Therefore, Korean 「반」 cannot always be replaced directly with Japanese 「半」.

• Example: 케이크를 반만 먹었어요.
  Romanization: ke-i-keu-reul ban-man meo-geo-sseo-yo.
  Translation: I ate only half of the cake.
  Japanese: ケーキを半分だけ食べました。
  Kana: ケーキをはんぶんだけたべました。
  Korean 「반만」 and Japanese 「半分だけ」 both indicate eating only half of the original portion. 「만」 and 「だけ」 add a restrictive sense of "only that much," emphasizing more strongly than a simple statement about eating half that the entire cake was not consumed.
• Example: 사과를 반으로 잘라 주세요.
  Romanization: sa-gwa-reul ban-eu-ro jal-la ju-se-yo.
  Translation: Please cut the apple in half.
  Japanese: りんごを半分に切ってください。
  Kana: りんごをはんぶんにきってください。
  Korean 「반으로 자르다」 and Japanese 「半分に切る」 both mean cutting an object into two halves. Korean uses 「으로」 to indicate the resulting state after cutting, while Japanese uses 「に」. Although the particles differ, both sentences describe the result of the completed action.
• Example: 일은 반쯤 끝났어요.
  Romanization: i-reun ban-jjeum kkeun-na-sseo-yo.
  Translation: About half of the work is finished.
  Japanese: 仕事は半分くらい終わりました。
  Kana: しごとははんぶんくらいおわりました。
  Korean 「반쯤」 and Japanese 「半分くらい」 both mean approximately half and are commonly used to describe progress on work or preparations. 「쯤」 and 「くらい」 make the quantity approximate, so it does not necessarily mean exactly 50%. It may simply indicate that something has reached roughly the halfway point.

◆ Differences from Korean 「반」:

Japanese 「半」 and Korean 「반」 correspond closely when indicating clock times, durations, and quantities. 「三時半」 can correspond to 「세 시 반」, 「一時間半」 to 「한 시간 반」, and 「一個半」 to 「한 개 반」. In these cases, both languages place the number and unit first, followed by a word meaning half. This makes it relatively easy to recognize the Korean equivalents of Japanese expressions.

However, the languages differ when expressing half of a particular whole. Japanese generally uses 「半分」, as in 「半分だけ食べる」 or 「半分に切る」. Korean can use 「반」 directly, as in 「반만 먹다」 or 「반으로 자르다」. In addition, Korean 「반쯤」 expresses approximately half, while Japanese 「半分くらい」 conveys a similar meaning.

When comparing Japanese and Korean, it therefore helps to understand 「半」 and 「반」 as related concepts first, then determine whether Japanese requires 「半分」 in the specific context. This distinction is especially important when describing food portions. 「一個半」 and 「半分」 represent different quantities, as do Korean 「한 개 반」 and 「반」. They cannot be used interchangeably simply because both meanings involve the Chinese concept of "half."

The usage of Japanese 「半」 changes according to the unit that comes before it. 「三時半」 indicates what time something happens, while 「三時間半」 indicates how long it lasts. 「一年半」 means one year and six months and cannot be confused with 「半年」, which means only six months. When referring to half of a food portion, a quantity, or the progress of a task, Japanese generally uses 「半分」. This differs from 「一個半」, which adds another half unit to a whole number.

When confirming meeting times, travel durations, or reservations in Japan, it is particularly important to distinguish 「時」 from 「時間」. If you want your rice portion reduced by half at a restaurant, you can say 「ご飯を半分にしてください」. With other expressions containing 「半」, examining the preceding unit and the meaning of the whole sentence will help you avoid confusing clock times, durations, and quantities.

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