Three simple steps
How to use the Age Calculator
- 01
Enter the date of birth you want to calculate from.
- 02
Keep today's date or choose another date to calculate age on.
- 03
See the exact calendar age and total elapsed days.
Date calculator
Age Calculator
Calculate an exact age in calendar years, months and days, plus the total number of days between a birth date and any target date.
Instant calculation Runs in your browser
Calculated using complete calendar years and months.
Exact age
36 years4 months and 24 days
Total days13,295
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Worked example
Born 12 March 1990, measured 20 June 2026
CalculationComplete calendar periods between the dates
Result36 years, 3 months, 8 days
The method
How it works
Calendar-aware calculation
The calculator counts complete calendar years first, then complete months, and finally the remaining days.
Different month lengths
Months are not treated as a fixed number of days. The calculation respects real calendar months and leap years.
Total elapsed time
The total-days figure measures the precise difference between the two selected dates in UTC calendar days.
Helpful answers
Frequently asked questions
Does the age calculator include today's date?
It measures the elapsed time from the start of the birth date to the start of the selected target date. This is the standard way to express a calendar age.
Does it account for leap years?
Yes. It uses real calendar dates, so February 29 and leap-year day counts are handled automatically.
Can I calculate age on a past or future date?
Yes. Change the target date to any date on or after the date of birth to calculate the age at that point.