Practice JLPTHow to tell them apart
わけだ expresses a conclusion the speaker draws from information just heard or observed, confirming what something means or why it happened. はず expresses an expectation based on prior knowledge or logic, predicting what should be true. Use わけだ when you're reacting to new information and saying 'so that's why' or 'that means.' Use はず when you're stating what you expect from what you already know. Swapping them sounds unnatural because わけだ confirms a reason, while はず predicts an outcome.
- わけだ Use わけだ when you've just heard or observed something and are drawing a logical conclusion from it.
- はず Use はず when you're expressing an expectation based on what you already know or assume.
| Grammar point | Meaning | JLPT level |
|---|---|---|
| わけだ wakeda | It means that/No wonder | N3 |
| はず hazu | Expectation / should be | N4 |
わけだ wakeda
It means that/No wonder
No wonder; so it means that ~; that's why; should ~; I take it that ~; naturally | The speaker's conclusion obtained through deductive, logical judgment or calculation on the basis of what he has heard or read.
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A:山田さんは英語のことは何でも知っています。 B: 生き字引というわけですか。
A: Mr. Yamada knows everything about English. B: Does that mean he's a living dictionary?
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A:来月から 四ヶ月フランスに行きます。 B:すると、六月に帰ってくるわけですね。
A: I'll go to France next month and stay there for four months. B: Then, I take it that you're returning here in June?
はず hazu
Expectation / should be
I expect that ~; it is expected that ~; ~ is expected to; I am fairly certain that ~; should; ought to; it is natural that ~; no wonder ~ | A dependant noun which expresses the speaker’s expectation that something will take place or took place or that someone/something is or was in some state.
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あの本は高かったはずだ。
I expect that book was expensive.
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そのアパートは奇麗なはずです。
I expect that apartment is clean.
わけだ and はず are JLPT N4–N3 grammar points that Japanese learners often mix up. This page compares them side by side — meanings, usage and example sentences — so you can tell them apart.