| 未満 (miman) | 以下 (ika) | |
|---|---|---|
| Meaning | Less than X / under X | X or less / up to and including X |
| Includes the number? | No — strictly below | Yes — X is included |
| English equivalent | “Under X” / “Less than X” | “X or less” / “X and under” |
| Example | 20歳未満 = under 20 (19 and below) | 20歳以下 = 20 and under (20 included) |
YukaWhat’s the difference between 未満 and 以下? They both seem to mean “under.”
ReiThe key is whether the number itself is included! 未満 means strictly LESS THAN — the stated number is NOT included. 以下 means UP TO AND INCLUDING — the stated number IS included.
What Does 未満 (miman) Mean?
未満 means less than or under — strictly below a number, not including it. 未 means “not yet” and 満 means “full/complete.” So 未満 literally means “not yet reaching.” This is the word used in laws and regulations where precise exclusion of the boundary matters.
- 20歳未満の飲酒は禁止です。 — Drinking alcohol is prohibited for those under 20 (under 20 = up to 19).
- 定員20名未満の場合は開催しません。 — We will not hold the event if attendance is under 20.
- 100万円未満の収入。 — Income of less than 1 million yen.
- 18歳未満お断り。 — No entry for those under 18 (18-year-olds must not enter).
What Does 以下 (ika) Mean?
以下 means or less or up to and including. It is inclusive — the stated number is part of the range. 以 means “from,” and 下 means “below.” It is the counterpart to 以上 (or more).
- 15歳以下は無料です。 — Children aged 15 and under (including 15) are free.
- 5,000円以下の商品。 — Products priced at 5,000 yen or less (5,000 included).
- 気温が10度以下になった。 — The temperature fell to 10 degrees or below.
- 以下の条件を満たす方。 — Those who meet the following conditions.
The Critical Distinction
| Age / Number | 未満 (miman) | 以下 (ika) |
|---|---|---|
| 20歳___ | 19 and below (20 NOT included) | 20 and below (20 included) |
| 18歳___ | 17 and below | 18 and below |
| 100点___ | 99 and below | 100 and below |
| 0度___ | Negative temperatures only | 0 degrees and below |
YukaWhich one is used for Japan’s legal drinking age?
Rei20歳未満の飲酒は禁止 — 未満 is used because the law means “strictly under 20.” 20-year-olds CAN drink. If it said 以下, then 20-year-olds couldn’t drink — that’s why the distinction matters in legal language!
Common Mistakes
- The most common mistake: treating 未満 and 以下 as the same. In legal/official contexts, they have very different implications.
- Memory tip: 未 = “not yet” — so 未満 = “has not yet reached that number” = strictly less than.
- In everyday casual speech, people sometimes use 以下 loosely to mean “under,” but in formal writing always check whether the boundary number is included or not.
Quick Quiz
Fill in: 未満 or 以下?
- 1. 18歳___の方は入場できません。 (Those under 18 cannot enter — 18-year-olds cannot enter.)
- 2. 料金は1,000円___です。 (The fee is 1,000 yen or less — 1,000 yen is acceptable.)
- 3. 体重30kg___のお子様専用。 (For children weighing strictly under 30kg.)
- 4. 気温5度___になると凍結注意。 (Caution for ice when temperature is 5 degrees or below.)
Answers: 1. 未満 2. 以下 3. 未満 4. 以下
📖 Want to take your Japanese further? Practice speaking with a professional Japanese tutor on italki — affordable 1-on-1 online lessons at your own pace.
Summary
| 未満 | 以下 | |
|---|---|---|
| Boundary number included? | No — strictly less than | Yes — up to and including |
| Think of it as | “Has not yet reached X” | “From X downward, X included” |
| Common context | Legal age limits, regulations | Price ranges, temperature, scores |
| Opposite | 超える (exceeds) | 以上 (or more) |
