How to say "convert" in Japanese

Choosing the right word
  • 変えるかえるJLPT N4approx.Common
    ichidan verb, transitive verbThe general-purpose choice: convert as changing something into a different form, state, or use. Typical context: turning a spare room into a study, or one kind of energy into another.
    なんで彼かれは考かんがえを変かえたのか。↗
    What made him change his mind?
  • 引き換えるひきかえるCommon
    ichidan verb, transitive verbIts convert sense is specifically money: converting one currency into another, dollars into yen and the like. It also means exchanging one thing for another, so it is not for converting forms or states.
  • 替えるかえるJLPT N3approx.Common
    ichidan verb, transitive verbReally the replace word: swapping one thing for another, old for new. Its convert sense is that substitution side, so it is seldom the word you want for convert.
    お花はなの水みずを替かえましょう。↗
    Shall I change the water for the flowers?
  • 変じるへんじるCommon
    ichidan verb, intransitive verbCovers convert as change-into: something turning into something else, being transformed or transfigured. It views the change from the side of the thing that changes, rather than the agent bringing it about.
  • 直すなおすJLPT N4approx.Common
    godan verb, transitive verbIts convert sense is reworking something into another form, close to its translate sense of putting words into another language. At heart it means fixing or correcting, so it is seldom the convert word.
    次つぎの文章ぶんしょうを日本語にほんごに直なおしなさい。↗
    Put the following sentences into Japanese.

Pick 「変える」 for changing something into a different form or state, 「引き換える」 for converting currency or exchanging things, 「替える」 for replacement-type swaps, 「変じる」 for one thing turning into another, and 「直す」 for reworking something into a new form.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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