Age Calculator
Exact age in years, months, days plus next-birthday countdown.
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About the Age Calculator
Find an exact age between any two dates. The Toolcenter Age Calculator breaks the span into years, months and days, shows totals in months, weeks, days and hours, tells you which weekday you were born on, and counts down to your next birthday.
How to use it
- 1Enter the date of birth.
- 2Optionally change the “age at” date (defaults to today).
- 3Read the exact years/months/days result.
- 4Check the totals and next-birthday countdown.
Key features
- Exact years, months and days
- Totals in months, weeks, days and hours
- Day-of-week you were born
- Days until your next birthday
- Works offline, nothing stored
Frequently asked questions
How is age in months and days calculated?+
It counts full calendar months and days, borrowing days from the previous month’s length when needed — the same way you would say your age aloud.
Can I calculate age at a past or future date?+
Yes. Change the “age at date” field to any date to see the age at that moment.
Does it account for leap years?+
Yes. Day totals use real calendar dates, so 29 February and leap years are handled correctly.
Is my birth date stored?+
No. The calculation runs in your browser and nothing is saved or sent.
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