Age Calculator
Work out an exact age from a date of birth — years, months and days, not just the rounded year. You also get total days and weeks lived, which weekday you were born on, and how long until the next birthday. Set an 'age at date' to work out how old someone was, or will be, on any other day.
Leave empty to use today.
Age
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Pick a date of birth to begin.
Nothing is uploaded — this tool runs inside your browser, so your files never leave your device.
Why use this tool
- Exact age in years, months and days, carried correctly across uneven months
- Total days, weeks and months lived
- The weekday you were born on, and your next birthday
- Works for any date, past or future, not just today
How it works
- 1Pick your date of birth.
- 2Leave 'age at date' empty for today, or set it to any other date.
- 3Read the exact age and the breakdown underneath.
Age Calculator — frequently asked questions
By counting whole years first, then whole months, then the remaining days — the same way people say it out loud. Month lengths differ, so the day count borrows from the correct previous month rather than assuming 30.
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