How age is worked out
The calculator compares your date of birth with today's date, borrowing days and months the way a calendar does so the result is exact. It accounts for leap years and for months of different lengths, then also shows the total days you've been alive.
Handy uses
Use it to fill in forms precisely, check eligibility for schemes, work out someone's age for a gift or event, or count down to a birthday. Because everything runs in your browser, the date you enter never leaves your device.
Frequently asked questions
Does it count leap years?
Yes. Leap days are included automatically, so the day and total-days figures are accurate.
Can I calculate age on a future date?
This version compares against today. Entering a future birth date shows a reminder instead of a negative age.
Is my date of birth saved?
No — it's used only for the calculation in your browser and is never uploaded.
Related tools
This tool runs entirely in your browser — nothing you enter is uploaded or stored.