Translation guide
How to express that something is useful, helpful, or of practical value in Japanese.
Describing something as useful, handy, or convenient in everyday situations.
The most common and versatile word for 'useful' or 'convenient'. Used for tools, services, locations, etc.
このアプリはとても便利です。
This app is very useful.
駅の近くに住んでいて便利だ。
It's convenient living near the station.
Literally 'to stand in a role', meaning 'to be useful' or 'to be of help'. Often used for information, skills, or people.
この辞書は本当に役に立つ。
This dictionary is really useful.
彼のアドバイスが役に立った。
His advice was useful.
A more formal or written term for 'useful' or 'beneficial'. Often used in technical or academic contexts.
この研究は非常に有用な結果をもたらした。
This research yielded very useful results.
Means 'convenient' or 'handy', often implying something is treasured for its usefulness. Slightly old-fashioned or literary.
この小さなナイフは重宝している。
This small knife is very handy.
Emphasizing the practical worth or effectiveness of something.
Means 'practicality' or 'utility'. Used when discussing whether something is practical for real-world use.
このデザインは実用性に欠ける。
This design lacks practicality.
実用性を重視した製品です。
It's a product that emphasizes usefulness.
Formal term for 'usefulness' or 'utility', often in academic or business contexts.
Describing a person or action that is helpful or provides assistance.
Means 'to be a help' or 'to be helpful'. Often used for people or actions that assist.
彼はいつも助けになる。
He is always helpful.
この情報が助けになるといいのですが。
I hope this information is helpful.
Also used for people being useful or helpful, though slightly more impersonal than 助けになる.
Evaluating whether an idea, suggestion, or feedback is useful.
Means 'to be informative' or 'to serve as a reference'. Commonly used when an idea or opinion is helpful for consideration.
あなたの意見はとても参考になりました。
Your opinion was very useful.
この本は参考になる。
This book is informative/useful.
便利 (benri) emphasizes convenience and ease of use, often for objects or locations. 役に立つ (yaku ni tatsu) emphasizes practical helpfulness or utility, often for information, skills, or people. For example, a smartphone is 便利, while a piece of advice is 役に立つ.
このスマホは便利だ。
This smartphone is convenient/useful.
このアドバイスは役に立つ。
This advice is useful.
The English noun 'usefulness' often sounds unnatural if directly translated into Japanese. Instead, use adjectives like 便利な or 役に立つ, or rephrase with 実用性 or 有用性 in formal contexts. For example, 'the usefulness of this tool' is better expressed as この道具の便利さ or この道具の有用性 rather than a forced noun form.
この道具の便利さは驚くほどだ。
The usefulness of this tool is amazing.
The usefulness of this technology is widely recognized.
彼はチームで役に立つメンバーだ。
He is a useful member of the team.