Age Calculator
Find an exact age between two dates. Enter a date of birth and the date to measure to — we'll show years, months, and days, plus total days and the countdown to the next birthday.
Years lived
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Check it outExact age, not just years
Calendars make age math tricky because months have different lengths and leap years add a day. This calculator borrows days and months correctly to give a precise years-months-days breakdown, the total days lived, and how long until the next birthday. Set the second date to any day to find age at that point in time.
How it’s calculated
This calculator returns its result directly from the values you enter using standard arithmetic for this calculation; all figures are estimates for general information.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Worked example
From Jan 1, 2000 to today gives an exact age in years, months, and days, plus the countdown to the next birthday.
Common mistakes
- Subtracting years only and ignoring months and leap years.
- Forgetting whether the end date is inclusive.
Where it is used
- Finding an exact age for a form or milestone.
- Counting down to a birthday or anniversary.
Frequently asked questions
Can I find my age on a past or future date?
Yes — set the second date to any day to see the age at that moment.
Does it handle leap years?
Yes. It counts real calendar days, so February 29 and varying month lengths are handled correctly.
Why might months and days look unusual?
Age is computed by borrowing from months when needed, which is the standard, accurate way to express it.
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