How to tell them apart
Both judge a result against an expectation, but 割に（は） links two qualities of the same subject (安い割に機能がいい: cheap yet functional), while にしては judges one trait against a category or known standard (日本の車にしては大きい: big for a Japanese car). Swapping them is unnatural because 割に（は） needs a proportional contrast within the item, whereas にしては invokes a general stereotype or background fact. Use 割に（は） for an unexpected balance between two attributes; use にしては when the benchmark is a group or prior assumption.
- 割に（は） Use 割に（は） when two qualities of the same thing are surprisingly out of proportion.
- にしては Use にしては when judging something against a general standard or category expectation.
| Grammar point | Meaning | JLPT level |
|---|---|---|
| 割に（は） ni ha | Fairly; in relative terms; when judged against what one would expect | N2 |
| にしては nishiteha | Considering something's usual standard; for | N3 |
割に（は） ni ha
Fairly; in relative terms; when judged against what one would expect
割に（は）expresses that something is relatively or comparatively different from what the preceding situation would lead you to expect, often with a nuance of contrast. It attaches to nouns and plain-form verbs and adjectives, and the emphatic form 割には highlights the gap between expectation and reality.
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彼は年の割に若く見えるので、大学生として通用します。
He looks so young for his age that he passes for a college student.
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現在の税制度のもとでは正直にやっていると割に合わない。
Honesty doesn't pay under the current tax system.
にしては nishiteha
Considering something's usual standard; for
にしては attaches to a noun (or a plain-form clause) and means that, when something is judged against the expectation that comes with that noun, the result is surprising or different from what you would expect. It carries a nuance of comparison against a normal standard, as in being unusually sensible for a child.
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言うまでもないことだがローマは１日にしては成らず。
It goes without saying that Rome was not built in a day.
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正確な時間に関して、その部屋の時計をあてにしてはいけない。
Do not rely on the room clock for the accurate time of day.
割に（は） and にしては are JLPT N3–N2 grammar points that Japanese learners often mix up. This page compares them side by side on meanings, usage and example sentences, so you can tell them apart.