How to Say "Acre" in Japanese

エーカー

ēkā[e̞ːka̠ː]

The English word "acre" is translated into Japanese as エーカー (ēkā).

エーカー is used as a unit of surface area. It is a loanword borrowed from English.

Meaning: unit of surface area (noun)

Which one should you use?

While the unit of measurement is エーカー (ēkā), the Brazilian state of Acre is spelled and pronounced differently as アクレ (Akure).

As a loanword, エーカー does not change its form for pluralization in Japanese.

ēkā

In Japanese land law and official real estate documents, the metric system is mandatory, making エーカー a word almost exclusively found in translated literature or foreign news.
While エーカー is used for international contexts, most Japanese people will instinctively use the traditional unit 坪 (tsubo) or 畳 (jō) when discussing land area.
The Japanese word for 'area' or 'acreage', 面積, literally combines the characters for 'surface' and 'measure'.

私は退職後のために８エーカーの農場を買った。
I bought an eight-acre farm for my retirement.
This sentence is useful for seeing how to use エーカー when discussing the size of a farm.
Tatoeba #155230 by bunbuku, translation #259309 by CK
その公園は約１０エーカーあります。
Sono kōen wa yaku jū ēkā arimasu.
That park is about 10 acres.
１エーカーの土地の値段を教えてください。
Ichi ēkā no tochi no nedan o oshiete kudasai.
Please tell me the price of one acre of land.

A man and a woman are looking at a real estate brochure.

大翔 Hiroto

この庭は、何エーカーくらいかな？
Kono niwa wa, nan ēkā kurai kana?
About how many acres is this garden?
結衣 Yui

たぶん、０.５エーカーくらいだと思うよ。
Tabun, rei ten go ēkā kurai da to omou yo.
I think it is probably about 0.5 acres.
大翔 Hiroto

結衣、それは広すぎるんじゃない？
Yui, sore wa hirosugiru n janai?
Yui, isn't that too large?
結衣 Yui

管理が大変そうだけど、素敵だよ。
Kanri ga taihen sō dakedo, suteki da yo.
It looks like a lot of work to maintain, but it is lovely.

Sources

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