Formula
This calculator uses the standard age calculator formula:
Frequently Asked Questions
Subtract your date of birth from today's date, accounting for months and days. For example, someone born 15 March 1990 and today being 21 March 2026 is 36 years old.
Multiply your age in years by 365.25 (accounting for leap years) and add the remaining days. Our calculator shows the exact total day count automatically.
Yes. The calculation uses actual calendar dates, so leap years are automatically accounted for in both total day count and year calculations.
This tool calculates age from a date of birth to today. For age between two specific dates, enter the earlier date as the birth date.
Age = Current date − Date of birth, calculated in full years, then remaining months, then remaining days. Partial months and years are handled by checking if the day/month thresholds have been passed.
You can estimate this by adding the number of years to your current age. Our tool calculates age as of today; for future dates, add the years manually.