Can I calculate age on a date other than today?

Yes. Choose any valid reference date in the Calculate age on field.

Does the calculator save my date of birth?

No. The calculation runs in your browser. Dates are only placed in a shareable link when you choose Copy link.

How are leap-day birthdays handled?

For a February 29 birthday, the next birthday is shown on the last day of February in years without February 29.

FREE ONLINE AGE CALCULATOR

Calculate age from a date of birth.

Find age in years, months, and days on today's date or any date you choose.

DATE INPUTS

Choose the dates

Date of birthCalculate age on (leave blank for today)

PRIVATE BY DEFAULT

This calculation runs in your browser. Leaving the reference-date field blank calculates age as of today.

ABOUT THIS TOOL

Age Calculator

Enter a date of birth and calculate calendar age on today’s date or a selected reference date, with years, months, days, totals, and next-birthday timing.

Age from date of birth
Age on a selected date
Years, months, days, weeks, and total days

KEY FUNCTIONS

Date-of-birth age calculationToday or a custom reference dateYears, months, and daysTotal months, weeks, and daysNext birthday timingOptional shareable pre-filled link

LEARN THE METHOD

Short guides for this workflow

GUIDECalculate age from a date of birthFind calendar age in years, months, and days on a chosen date.Read →

KEEP SOLVING

Browse all tools →

●

BMI Calculator

Use adult height and weight measurements to calculate BMI as a screening measure. An optional age field confirms this adult-only tool is appropriate; it is not a diagnosis.

→⇄

Unit Converter

Convert engineering, science, and everyday units through 17 flexible categories, with pre-filled shareable URLs for exact conversions.

→%

Percentage Calculator

Choose from ten percentage workflows including change, reverse calculations, selling-price markup, profit margin, and compound growth.

→