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Age Calculator
Age Calculator works out the exact gap between a date of birth and today in years, months and days, the figure you need for forms, milestone planning and eligibility checks.
How to use Age Calculator
- Pick the date of birth from the date field.
- Calculate to see the age broken into years, months and days.
- Read the individual components separately if a form asks for just one.
Where Age Calculator is useful
- Filling in an age field that asks for years and months.
- Checking whether someone reaches an age milestone before a deadline.
- Confirming the exact number of days until a birthday.
Formats, algorithms and limits
The difference is computed from your device's current date and clock, with calendar months of varying length handled correctly: borrowing from the previous month when the day of the month has not yet been reached. Because it uses the local date, a device with the wrong time zone or date can shift the result by a day.
Troubleshooting and honest limits
- Check the date field's order (year-month-day) before trusting the result on a locale that formats dates differently.
- For official documents, state the age in whole years as the form expects rather than in months and days.
- If the birthday is today, the result already counts the new year — the exact-day part will read zero.
Frequently asked questions
Does it handle leap years?
Yes. Month lengths come from the browser's own calendar arithmetic, so February 29 is accounted for.
Can it calculate a future date or a date range?
It calculates from today backwards. For two arbitrary dates use the Date Difference calculator instead.
Why is my result one day off from another calculator?
That usually comes from time zones: the other tool may be working from midnight UTC. Set the date and time zone correctly on your device for the exact local answer.
Is my date of birth sent anywhere?
No, the calculation runs entirely in the browser.
Related tools
Page written and reviewed by the FreeConvertio engineering team on 2026-10-14. Age Calculator runs entirely in your browser — no uploads, no account and no daily limits.