変える vs 換える
JLPT N4 vocabulary · what is the difference?
Both are read かえる. 変える means to alter something so it becomes different — a plan, a colour, your mind. 換える means to swap one thing out for another of the same kind — batteries, currency, the air in a room. If nothing is being swapped, it is 変える.
When to use each
変える
かえる
Use 変える when one thing stays but takes on a new form, value or state: changing plans, changing your mind, changing a colour or the way you do something. This is the default and by far the more common.
予定を変えてもいいですか。
よていをかえてもいいですか。
May I change the plan?
彼は考えを変えませんでした。
かれはかんがえをかえませんでした。
He didn't change his mind.
換える
かえる
Use 換える when one item is taken out and another put in its place — replacing batteries, exchanging money, airing a room. It lives mostly in compounds: 入れ換える, 言い換える, 乗り換える.
電池を新しいものに換えました。
でんちをあたらしいものにかえました。
I replaced the batteries with new ones.
空港で円をドルに換えます。
くうこうでえんをドルにかえます。
I'll exchange yen for dollars at the airport.
Sentences where only one works
髪の色を変えました。
かみのいろをかえました。
I changed my hair colour.
The same hair takes on a new colour — an alteration, so 変える. Nothing is swapped out.
古いタオルを新しいのに換える。
ふるいタオルをあたらしいのにかえる。
Swap the old towel for a new one.
Two items, one replacing the other: the ～を～に換える frame is the clearest signal for 換.
やり方を変えたほうがいいです。
やりかたをかえたほうがいいです。
You'd better change your approach.
Abstract things — methods, opinions, rules — take 変える.
名古屋で新幹線に乗り換えます。
なごやでしんかんせんにのりかえます。
I'll change to the Shinkansen at Nagoya.
Changing trains is a swap of one vehicle for another, which is why the fixed compound is written 乗り換える.
Common mistakes
予定を換える
予定を変える
A plan is modified, not traded in. 換 with an abstract object reads as if you handed the plan over and got a different one back.
電車を変える
電車を乗り換える
For changing trains Japanese uses the set verb 乗り換える. 電車を変える would suggest altering the train itself.
お金を変える
お金を換える
Currency exchange is the textbook swap of equal value, so 換 is expected — one of the few places where writing 変 looks clearly wrong.
Frequently asked questions
If I'm unsure, which kanji is safer?
変える. It covers the broad 'make it different' meaning and is what most writers reach for when the swap sense is not obvious. 換える is narrow and appears mostly in fixed compounds.
Do Japanese people really keep these apart?
In careful writing, yes, but in casual typing many people write 変える across the board, and some cases genuinely allow either. The compounds 入れ換える, 言い換える and 乗り換える are where 換 is firmly expected.
What about 替える and 代える?
Two more かえる. 替える is replacing with something fresh of the same kind (着替える, 両替), very close to 換える; 代える is substituting one thing to serve in another's role. Beginners can safely stay with 変える and the fixed compounds.