“〜igai・〜ika・〜ijou・〜inai”: Expressing Ranges [JLPT N1]
Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026
Master range expressions to boost your precision in Japanese!
Does 「18歳以上」 include 18? — the range words 以上・以下・以内・以外
「入場は18歳以上」 — does that include 18-year-olds? Yes, it does! This set of range/boundary words trips learners up most on “does it include the boundary”: 以上 (いじょう) = “≥, includes the number,” 以下 (いか) = “≤, includes the number,” 未満 (みまん) = “<, excludes,” 以内 (いない) = “within the range (inclusive),” 以外 (いがい) = “other than.” This guide sorts out the boundaries and uses of this range set at once.
Core: a range bounded by a number/standard
Bounded by a number or standard:
- 以上 = “that number and up, ≥”: 80点以上 (80 points and up).
- 以下 = “that number and down, ≤”: 18歳以下 (18 and under).
- 未満 = “under, < (exclusive)”: 18歳未満 (under 18, not incl. 18).
- 以内 = “within a range of time/distance/quantity (inclusive)”: 1週間以内 (within a week).
- 以外 = “other than”: それ以外 (other than that).
Key: 以上/以下/以内 all include the boundary; 未満 excludes it.
How to Connect
| Form | Meaning | Boundary |
|---|---|---|
| noun ＋ 以上 | ≥ (incl.) | includes it |
| noun ＋ 以下 | ≤ (incl.) | includes it |
| noun ＋ 未満 | < (excl.) | excludes it |
| noun ＋ 以内 | within (incl.) | includes it |
| noun ＋ 以外 | other than | — |
Examples in use
- 入場は18歳以上の方に限ります。(Entry is limited to those 18 and over.) — ≥
- 12歳以下の子供は無料です。(Children 12 and under are free.) — ≤
- 18歳未満は入場できません。(Those under 18 may not enter.) — <
- レポートは1週間以内に提出。(Submit the report within a week.) — within a range
- 日曜日以外は毎日開いています。(Open every day except Sunday.) — other than
⚠️ Where learners slip up
① 以上/以下 “include” the boundary; 未満 “excludes” it. 18歳以上 = includes 18 (18, 19, 20…); 18歳以下 = includes 18 (…16, 17, 18); so someone who just turned 18 fits both “以上” and “以下”! For “not included,” use 未満 (18歳未満 = 17 and under, not incl. 18). This is a favorite test trap.
② 「以内」 vs 「以下」. 以内 = “within” a range of time, distance, quantity (1時間以内 = within an hour, 10km以内); 以下 = a numeric “≤,” or “as follows” (3人以下, 以下の通り). For “within a range/deadline” use 以内; for “a value ≤” use 以下.
③ 「以外」 = other than (≠ 以内). 以外 = other than… (excluding some item) (君以外みんな知ってる = everyone but you knows); don't confuse it with 「以内 (within a range)」 — one “excludes,” the other is “within.” 以外 often pairs with 「〜以外に(も)」 for “besides ~ (also).”
🔄 Compare with similar forms: 以上／以下／未満／以内
| Form | Meaning | Incl. boundary? | Example |
|---|---|---|---|
| 〜以上 | ≥ (that number or more) | ✓ yes | 80点以上 |
| 〜以下 | ≤ (that number or less) | ✓ yes | 18歳以下 |
| 〜未満 | < (under, exclusive) | ✗ no | 18歳未満 |
| 〜以内 | within a range/deadline | ✓ yes | 1週間以内 |
💡 Learning tip
For this range set, the one thing that matters most is “does it include the boundary”: 以上 (≥, incl.), 以下 (≤, incl.), 以内 (within, incl.) — all inclusive; only 「未満 (<, excl.)」 excludes it. So 「18歳以上」 includes someone who just turned 18, while 「18歳未満」 is 17 and under (not incl. 18). Three practical points: ① “≥/≤” → 以上/以下 (inclusive); ② “under, less than” → 未満 (exclusive); ③ “within a range of time/distance/quantity” → 以内, “other than” → 以外. Laws, eligibility rules, and ticket terms use these daily — nail “inclusive/exclusive” and you won't botch an eligibility age or deadline.
❓ Questions you might have
Q: Does 「18歳以上」 include 18? What about 「未満」?
Both 「以上」 and 「以下」 ‘include' the number: 18歳以上 = includes 18 (18, 19, 20… all count); 18歳以下 = includes 18 (18, 17, 16… all count). So someone exactly 18 fits both “18歳以上” and “18歳以下” (both include 18). 「未満」, by contrast, ‘excludes' it: 18歳未満 = under 18 (= 17 and under; 18 itself doesn't count). Example: 「20歳未満飲酒禁止」 = those under 20 (not incl. 20, i.e., 19 and under) may not drink; the moment you turn 20 you can. Mnemonic: 以上/以下 = include the number; 未満 = excludes it (a one-year difference — a test favorite).
Q: How do I tell 「以内」 from 「以下」?
By whether it's for a “range/deadline” or a “numeric size.” 「以内」 = “within, not exceeding” a range of time, distance, quantity (inclusive): 1時間以内に戻る (be back within an hour — a time range), 駅から10分以内 (within 10 min of the station — distance/time), 1000字以内 (within 1000 characters — a quantity cap). 「以下」 = a numeric “≤ (inclusive),” or “as follows”: 3人以下のグループ (a group of 3 or fewer), 詳細は以下の通り (details as follows). So: “within a deadline/range” → 以内; “a value ≤” → 以下. 「30分以内」 = within a 30-minute range (stressing not exceeding that range); 「30点以下」 = 30 points or fewer (stressing the numeric size).
🖊️ Practice Quiz
Q1. 「入場は18歳___の方に限ります。」(admission limited to 18 and over)
(A) 以下 (B) 以内 (C) 以上 (D) 以外
Q2. 「レポートは1000字___で提出してください。」(submit within 1000 characters)
(A) 以外 (B) 以内 (C) 以上 (D) 以下
Q3. 「日曜日___は毎日アルバイトをしています。」(work part-time every day except Sunday)
(A) 以上 (B) 以下 (C) 以内 (D) 以外
Q4. What does 「以上」 mean?
(A) less than that number (exclusive)
(B) that number or more (inclusive, ≥)
(C) greater than that number (exclusive)
(D) outside that number
Q5. 「合格するには80点___が必要です。」(passing requires 80 points or more)
(A) 以内 (B) 以上 (C) 以下 (D) 以外
Answer Key
1. (C) 以上 ── 18歳以上 = 18 or older (≥18).
2. (B) 以内 ── 1000字以内 = within 1000 characters (not exceeding).
3. (D) 以外 ── 日曜日以外 = except Sunday.
4. (B) ── 以上 = that number or more (inclusive, ≥).
5. (B) 以上 ── 80点以上 = 80 points or more (inclusive).