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The comparison date defaults to today but can be changed for a past or future reference.
Calculators · Local processing
Age Calculator
Calculate exact calendar age and totals in months, weeks, and days for any comparison date.
Calendar arithmetic
Calculate exact age
Dates use calendar-aware month and day arithmetic, including leap years.
Choose a date of birth to see the exact age.
The practical guide
Use calendar-aware age arithmetic, including leap years.
The result counts completed years and months, then the remaining calendar days.
Totals use elapsed days
Total days are measured between UTC calendar dates, avoiding daylight-saving time shifts.
Privacy by architecture
Your files and tool inputs stay in your browser.
The selected files, inputs, settings, and outputs are processed in this page and are not uploaded to any server.
Questions, answered
Frequently asked questions
Does this handle leap years?
Yes. Month lengths and leap days are handled with calendar-aware arithmetic.
What are total weeks?
The value is the number of complete seven-day periods in the total elapsed days.
Are dates stored or uploaded?
No. The dates exist only in this page while you use it.