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年齢計算

正確な年齢を計算

ブラウザで動作 · アップロード不要

このツールとページ内の説明は、現在は英語のみです。動作は同じで、すべてブラウザ内で実行されます。

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  • 登録不要・透かしなし
  • 無料

How to calculate an age

  1. Enter the date of birth.
  2. Keep today's date, or choose another date.
  3. Read the age in years, months and days, and the totals.

Leap-day birthdays

People born on 29 February are counted as having their birthday on 28 February in years without one, so they turn a year older on that day.

よくある質問

Why can months and days differ between calculators?

Months have different lengths. This calculator counts whole calendar months first (31 January plus one month is the end of February), then the days left over.

Is anything sent anywhere?

No. The calculation happens in your browser, and the dates you enter never leave your device.