How to say "capacity" in Japanese

Choosing the right word
  • 容量ようりょうCommon
    nounThe common word for capacity as the amount a container or device can hold — think of a tank's capacity or how much data a drive can store. It concerns holding space rather than flow.
    タンクの容量ようりょうは50ガロンだ。↗
    The tank has a capacity of fifty-gallons.
  • 体積たいせきJLPT N2approx.Common
    nounReally the three-dimensional volume of a solid object, measured in cubic units; for 'capacity' it is marginal, and you will seldom want it unless geometric volume is meant.
    体積たいせきが大おおきいからといって常つねに重量じゅうりょうも重おもいとは限かぎらない。↗
    Great bulk does not always mean great weight.
  • 技能ぎのうJLPT N1approx.Common
    nounMaps to 'capacity' only in the sense of ability; the word is really about practical, technical skill, so think of a person's trained skill, not amounts, containers, or throughput.
    This course teaches basic skills in first aid.
  • 流量りゅうりょうCommon
    nounFits 'capacity' when the amount is a rate of flow or throughput per unit time — water flow, electrical current, or data traffic. For static holding capacity this is not the word.
  • 量りょうJLPT N3approx.Common
    noun, noun (suffix)The broad, general word for quantity or amount; it matches 'capacity' only loosely, for how much there is of something, not the specific holding or throughput senses.
    彼女かのじょはかなりの量りょうの酒さけを飲のんだ。↗
    She has had quite a lot to drink.

Choose 容量 for how much a container or device can hold, 流量 for flow or throughput per unit time, 技能 for ability, 体積 for physical three-dimensional volume, and 量 for amount in general.

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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