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Days & Age Calculator

Calendar-accurate age math that handles leap years and month lengths correctly. Also counts days between two dates using UTC dates.

Calculators Everyday Runs locally No sign-up

Age calculator

Exact years, months, and days
Leave blank to use today.
Years —
Months —
Days —
Total days —
Total months —

Enter a birth date to calculate an exact age.

Days between dates

UTC-safe calendar math
Total days —
Full weeks —
Extra days —

Choose two dates to count the days between them.

Dates are parsed as calendar days in UTC, so daylight-saving changes never add or remove a day. Leap years are handled using the real calendar. A 29 February birthday is treated as 28 February in non-leap years, and the next-birthday countdown uses the next real 29 February.

About Days & Age Calculator

Work out an exact age in years, months, and days, or count the days between two dates.

This tool runs locally in your browser. It does not upload your input, require an account, or store your data on a server. If a feature needs a network request, the interface asks before sending anything.

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