Meaning & usage
わけだ at the end of a sentence presents the situation as a natural conclusion or restatement, often translated as no wonder or that means. It is used when a reason is already known and the speaker points out the expected result, as in 上手なわけだ or 着いたわけだ. It follows the plain form of verbs and i-adjectives, na-adjectives with な, and nouns with である or だった, never な or の alone for nouns. It sounds explanatory and conversational rather than formal.
Example sentences 6
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道理で彼らが彼女の申し出を断ったわけだ。
No wonder they turned down her offer.
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毎日練習したから、上手なわけだ。
You practiced every day, so it's only natural you're good.
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早く出たので、もう着いたわけだ。
He left early, so it's only natural he's already arrived.
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八時間寝たから、元気なわけだ。
I slept eight hours, so no wonder I feel great.
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道理で部屋が明るいわけだ。
No wonder the room is bright.
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彼女は忙しいから、来ないわけだ。
She's busy, so it's only natural she isn't coming.
In past JLPT papers
This came up in 1 past exam question.