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Japanese vocabulary · Beginner
How do you say "diameter" in Japanese?
直径
chokkei
In Japanese, "diameter" is 直径 (chokkei).
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Pronunciation
Chokkei needs a held double-k, so pause slightly between chok and kei, giving it a clipped, snappy rhythm rather than a smooth glide.
Writing and usage
直径 is written using kanji. It's a noun, and this word is also taught inside the Noun Town language learning game, where it appears in interactive lessons alongside hundreds of other everyday words.
Example sentence
彼女は車輪の直径を測った。
kanojo ha sharin no chokkei wo hakatsu ta.
She measured the diameter of the wheel.
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How to remember 直径
Chokkei has 'check' hiding in it — check the full width of the circle, straight across, and you've measured the diameter.
Related words
- circle 円 en
- triangle 三角形 sankakukei
- rectangle 長方形 chouhoukei
- diamond ダイヤモンド daiyamondo
- oval 楕円形 daenkei
- hexagon 六角形 rokkakkei
- pentagon ペンタゴン pentagon
- cube 立方体 rippoutai
- sphere 球面 kyuumen
Browse all Japanese words in the glossary.
Questions about 直径
How do you pronounce 直径?
Chokkei needs a held double-k, so pause slightly between chok and kei, giving it a clipped, snappy rhythm rather than a smooth glide.
Is 直径 formal or casual?
直径 is a neutral, everyday word that works in both casual and polite speech. The level of formality comes from the sentence structure around it, not from the word itself.
How is 直径 written in Japanese?
直径 is written using kanji. Romanised, it reads as chokkei.
Where can I practice Japanese words for free?
You can play free Japanese minigames in your browser on the Noun Town online games page, with no sign-up needed. Every word in the Japanese glossary also has native audio and an example sentence you can revisit any time.
"Diameter" in other languages
Curated by Callan Ratcliffe
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