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〜わけだ

no wonder, that's why; which means

Plain form + わけだ (な-adj + な · Noun + の / という)

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わけ means "reason" or "logic", and わけだ says something follows naturally: 暑いわけだ。三十五度もある, "no wonder it's hot. It's all of 35 degrees".

It often comes after learning the cause of something you'd noticed: "so that's why". 道理で ("no wonder") and なるほど ("I see") often come just before it.

It also states the logical result of a calculation or explanation: 毎日三十分歩けば、一週間で三時間半歩くわけだ, "walking thirty minutes a day means three and a half hours a week".

With ね, it checks your understanding of what someone said: つまり、明日は来られないわけですね, "so what you're saying is you can't come tomorrow".

Examples

  • 暑あついわけだ。三十五度さんじゅうごどもある。

    No wonder it's hot. It's all of 35 degrees.

  • 十年じゅうねんも日本にほんに住すんでいたのか。日本語にほんごが上手じょうずなわけだ。

    You lived in Japan for ten years? No wonder your Japanese is good.

  • 毎日三十分歩まいにちさんじゅっぷんあるけば、一週間いっしゅうかんで三時間半歩さんじかんはんあるくわけだ。

    If you walk thirty minutes a day, that means three and a half hours a week.

  • 窓まどが開あいている。道理どうりで寒さむいわけだ。

    The window's open. So that's why it's cold.

  • つまり、明日あしたは来こられないわけですね。

    So what you're saying is you can't come tomorrow.

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