Age Calculator

Exact age in years, months and days — plus total days, weeks and next birthday.

Stays on your device. This tool runs in your browser — nothing you paste or open ever leaves it. Nothing uploaded, nothing to leak.

Date of birth

Age at (defaults to today)

Enter a date of birth on or before the “age at” date.

Age

months

weeks

days

hours

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How to use it

Enter your date of birth. The result is worked out to today automatically; to find an age on a different day — a past date or a future one — set the “age at” date as well.

Age Calculator — TechWhack Score

9.5/10

Privacy 10/10

Your date of birth stays on your device — the age is worked out in the browser and never uploaded.
Speed 10/10

Enter a date and the full breakdown appears at once.
Features 8/10

Exact years, months and days, plus totals in months, weeks, days and hours, your next birthday, and the age on any past or future date.
Free 10/10

No sign-up, no limits.

Verdict: Handles leap years and month lengths correctly, so 29 February and end-of-month birthdays come out right instead of off by a day.

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An age calculator works out exactly how old you are from your date of birth — in years, months and days — up to today or any date you choose. It counts leap years and different month lengths correctly, and also shows your age in total months, weeks, days and hours, plus how long until your next birthday.

How age is counted

Age is the time from your birth date to the target date, expressed as whole years, then the leftover months, then the leftover days. February and leap years are handled exactly, so 29 February birthdays and month boundaries come out right.

What people use it for

Filling in forms that need an exact age, checking eligibility against a cut-off date, counting down to a birthday or milestone, and working out an age as of some date in the past or future.

FAQ

How old am I exactly?Enter your date of birth and the calculator shows your age in years, months and days as of today, plus your age in total weeks, days and hours.

How is age worked out in years, months and days?It counts complete years from your birth date to the target date, then the remaining whole months, then the remaining days — accounting for how many days each month actually has.

Does it handle leap years?Yes — leap years and variable month lengths are counted exactly, so 29 February and end-of-month dates are correct.

Can I calculate my age on a past or future date?Yes — set the “age at” date to any day and it works out the age you were, or will be, then.

Is my birth date stored anywhere?No — the calculation runs entirely in your browser; nothing is uploaded or saved.