年齢計算機

共有リンク

はじめに

Age Calculator — Exact age in years, months, days, hours and seconds. Enter Date of birth, As of to get an instant, accurate result.

計算式

Calendar-aware year/month/day difference between two dates, plus totals in days/hours/minutes/seconds.

ステップごとの説明

Enter the Date of birth.
Enter the As of.
Click Calculate to see your result instantly.

実例

Example: With Date of birth = 2000-01-15, As of = 2026-10-09, the Age Calculator gives Years: 26, Months: 8, Days: 24.

よくある質問

Does it account for leap years?

Yes, since it's calculated from real calendar dates rather than a fixed 365-day year.

Can I calculate age as of a future or past date?

Yes, change the "as of" date to any date you like, not just today.

What inputs does the Age Calculator need?

You'll need to provide: Date of birth, As of. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Age Calculator?

The Age Calculator applies the formula exactly as calculated — Calendar-aware year/month/day difference between two dates, plus totals in days/hours/minutes/seconds. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Age Calculator free to use?

Yes, the Age Calculator is completely free, requires no signup, and runs instantly in your browser.