Everyday Tools
Age Calculator
Enter any birthdate to get an exact age — years, months, and days — plus total days lived, weeks, hours, the day of the week you were born, and a countdown to y
Private by design: this tool runs 100% in your browser. Nothing you enter is sent, stored, or tracked.
How to use this calculator
- Enter the date of birth.
- Optionally change the 'as of' date (defaults to today).
- See the full breakdown instantly.
How exact age is computed
The calculator accounts for leap years and varying month lengths by working with real calendar dates: full years elapsed, then full months, then remaining days — the same way official documents compute age.
Worked example
Born 15 March 1990, as of 4 October 2026: 36 years, 6 months, 19 days old — 13,352 days lived.
About this tool
Enter any birthdate to get an exact age — years, months, and days — plus total days lived, weeks, hours, the day of the week you were born, and a countdown to your next birthday.
Frequently asked questions
Why does my age differ from other calculators?
Most differences come from leap-year handling and whether the current day is counted. This calculator uses real calendar arithmetic, matching official age computation.
Can I calculate age at a past or future date?
Yes — change the 'as of' date to any date to see the age on that day, useful for eligibility cutoffs and historical questions.
Does it handle leap-day birthdays?
Yes. Feb 29 birthdays are computed correctly across leap and non-leap years.
Is my birthdate private?
Yes — the calculation runs entirely in your browser. Your birthdate is never transmitted or stored.