Age Calculator

What the Age Calculator does

The Age Calculator works out your exact age from a date of birth — down to years, months, days, hours, and minutes — as of today or any other date you choose. It handles the leap-year and varying-month-length math automatically, which is easy to get wrong doing it by hand.

How to use it

1. Enter your date of birth.
2. Optionally change "Calculate age as of" if you want your age on a date other than today.
3. Click Calculate Age to see the full breakdown.

Common uses

• Checking exact age eligibility for a school admission, visa, or age-restricted service.
• Working out age at a specific past or future date, like a wedding or graduation.
• Confirming eligibility for age-based pricing, discounts, or pension rules.
• Calculating a precise age in days for a baby or pet milestone.
• Verifying date-of-birth entries during data entry or form validation.

Good to know

The calculator accounts for leap years automatically, so age-in-days figures stay accurate even across February 29th birthdays. If you need age as of an official cutoff date (many eligibility rules use a fixed date like January 1st or the start of an academic year), set that date explicitly in the "as of" field rather than relying on today's date.

Age calculations that need to be precise to the day come up more often than people expect — insurance underwriting, certain visa and immigration rules, age-based sports league eligibility, and some legal contexts all rely on exact age rather than a rounded figure. Because the calculator accounts for the actual number of days in each month and leap years automatically, it avoids the small errors that creep into manual age calculations, especially for people born in February of a leap year.