How to say "ounce" in Japanese

• オンスCommon
  nounThe unit of weight (about 28 grams), written in katakana; use it when 'ounce' refers to actual measurement, as in a recipe or a baby's weight, not to figurative amounts.
  金衡かねひら１ポンドは１２オンスである。↗

  One pound troy weighs 12 oz.
• かけらCommon
  nounThe figurative 'ounce': a mere trace, shred, or scrap of something such as truth or conscience, as in 'not an ounce of truth'; usually written in kana alone.
  彼かれは勇気ゆうきのかけらもなかった。↗

  He didn't have a grain of courage.

Use 「オンス」 for the unit of weight in actual measurement; use 「かけら」 for the figurative 'ounce' — an ounce of truth or conscience — where it means a mere trace or shred.

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

• オンスounce
• ゆきひょうsnow leopard (Panthera uncia)
• かけらounce (of truth, conscience, etc.)