Age
Decimal Age Calculator
Express your age as decimal years using the actual length of your birthday year.
Open tool →Age
Age on a Specific Date
Find your age on a past or future date.
1
Your dates
On this deviceYour dates are remembered here for 30 days. No account needed.
2
Your story in numbers
Every date has a story.
Enter your dates to discover your result and the next dates worth keeping.
Understanding your result
Complete calendar months are counted first, followed by remaining days. Twelve months make a year. Missing month-end dates are clamped to the last day: February 29 becomes February 28 for this calendar-age convention.
See a worked example
Illustrative example, as of September 13, 2026.
- Date of birth
- 1991-05-16
35 years, 3 months, 28 days
Are my dates sent to a server?
Calculations run in your browser. Your dates stay on this device unless you choose to include them in a sharing link or image. “Clear my dates” removes them from local storage.