Translation guide
The proportion of attempts that achieve a desired outcome. In Japanese, this is most commonly expressed with 成功率 (seikōritsu), but other terms like 合格率 (gōkakuritsu) or 達成率 (tasseiritsu) are used in specific contexts. This guide covers the main expressions and their appropriate usage.
Expressing the percentage or proportion of successful outcomes in a general sense, such as in business, projects, or experiments.
The standard term for 'success rate' in most contexts. It refers to the ratio of successful attempts to total attempts.
この治療法の成功率は約80％です。
The success rate of this treatment is about 80%.
新製品の成功率を上げるには、市場調査が欠かせません。
To increase the success rate of new products, market research is essential.
Literally 'success probability'. Often used in more technical or statistical contexts, similar to 'probability of success'.
この作戦の成功確率は低いと見られています。
The success probability of this strategy is considered low.
Referring specifically to the rate of passing an exam, test, or screening process.
The standard term for 'pass rate' in the context of exams, tests, or qualifications.
今年の司法試験の合格率は過去最低でした。
The pass rate for this year's bar exam was the lowest on record.
この学校の大学合格率は非常に高いです。
The university admission success rate of this school is very high.
Expressing the rate at which goals, targets, or plans are achieved or completed.
Used for the rate of achieving a target or goal, often in business or project management.
今月の売上目標の達成率は120％でした。
The achievement rate of this month's sales target was 120%.
Specifically refers to the completion rate of tasks or projects, often used in project management or software development.
プロジェクトの完了率は現在60％です。
The project completion rate is currently 60%.
Expressing the rate of successful attempts in sports, such as shooting percentage, save percentage, or win rate.
Also used in sports contexts for success rate of specific actions (e.g., free throw percentage, pass completion rate).
彼のフリースローの成功率は90％を超えています。
His free throw success rate exceeds 90%.
Specifically 'win rate' or 'winning percentage', used in competitive sports and games.
Expressing the rate of successful outcomes in medical treatments, clinical trials, or scientific experiments.
Often used in medical contexts to mean 'efficacy rate' or 'response rate' of a treatment.
この新薬の有効率はプラセボより有意に高かった。
The efficacy rate of this new drug was significantly higher than the placebo.
Specifically 'cure rate' or 'healing rate', used for diseases or conditions.
早期発見すれば、この癌の治癒率は高いです。
If detected early, the cure rate for this cancer is high.
成功率 is the general term for success rate. 合格率 is specifically for passing exams or screenings. 達成率 is for achieving targets or goals. Use the term that matches the context to sound natural.
手術の成功率は高いが、試験の合格率は低い。
The success rate of the surgery is high, but the exam pass rate is low.
The English loanword レート (rate) is not combined with 成功 to mean 'success rate'. Use 成功率 instead. 成功レート sounds unnatural.
このチームの今シーズンの勝率は7割です。
This team's win rate this season is 70%.