How to say "usefulness" in Japanese

• 便利さべんりさCommon
  nounThe everyday sense of 'usefulness': how handy or convenient something is in daily life. Choose this when you mean practical convenience — a tool, place, or app that makes things easier.
  駅えきの傍かたわらに住すむ便利べんりさに対たいしてあなたはお金かねを払はらっているのです。↗

  You pay for the convenience of living near a station.
• 有用性ゆうようせい
  nounUsefulness as an abstract quality: the degree to which something is of use. This is the most direct equivalent of the English noun, typical in discussion of the value of methods, data, or skills.
• 益体やくたい
  nounSeldom the word you want for 'usefulness': it really conveys being orderly and proper, and is chiefly familiar from a set negative phrase meaning 'pointless, idle'.
• 実用性じつようせい
  nounUsefulness in the practical sense: how well something performs in actual use. The usual choice when judging the practicality of tools, products, systems, or designs.

Use 「便利さ」 for everyday handiness and convenience, 有用性 for usefulness as an abstract quality under discussion, 実用性 for practical, real-world utility, and skip 益体, which is seldom the word you want.

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

• 便利さべんりさconvenience
• 有用性ゆうようせいusefulness
• 益体やくたいusefulness
• 実用性じつようせいpracticality