Age Calculator
Work out your age or someone else's age in years, months, days, and totals.
Inputs
Result
Enter values on the left and select Equals to see the result here.
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What the Age Calculator does
- Computes your age breakdown (years, months, days) for a target date.
- Also provides total days, weeks, and months elapsed.
How to use the Age Calculator
- Enter a date of birth.
- Optionally choose a target date (defaults to today).
- Click Calculate to see the age breakdown.
Formula / methodology used
- Uses calendar-aware year/month/day differences (not a simple days ÷ 365 approximation).
- Validates that the target date is not before the birth date.
Example calculation
Born 2000-01-15, target 2026-03-17.
- Set birth date
- Set target date
- Compute Y/M/D difference
Result: Outputs include years, remaining months/days, and total days/weeks.
Age Calculator FAQs
Why do months and days vary?
Months have different lengths, so a calendar-based calculation is more accurate than using averages.