Home › Calculators › Calculators
Age Calculator
Birthdays are easy to lose track of — this calculator gives your exact age in years, months and days, plus total days lived and the date of your next birthday. Enter your date of birth and, if you like, a different 'as of' date for planning (a form, an application, a milestone).
Use the tool
How to use the Age Calculator
- Enter your date of birth and optionally the date to calculate from.
- Adjust any optional settings to match your page, business or campaign.
- Click the button to generate your result instantly — nothing is uploaded; the tool runs in your browser.
- Copy the result, or download it as a file where that option appears, and paste it into your site, document or campaign.
Frequently asked questions
How is the age calculated?
Full calendar years first, then remaining months and days — so 15 May 1990 to 1 November 2026 is 36 years, 5 months and 17 days, not a rounded decimal.
Can I calculate age on a past or future date?
Yes. Leave 'as of' blank for today, or set any date — useful for checking an age on an application deadline or a future milestone.
What about leap years and 29 February birthdays?
Leap days are handled by real calendar maths, so total days lived is exact. A 29 February birthday in a non-leap year is counted on 1 March.
Is my date of birth stored anywhere?
No. The calculation runs entirely in your browser and nothing is sent to a server.