Exact Age Calculator by Birthdate: Years, Months & Days
Calculate your exact age in years, months and days, how many days you have lived and how long until your next birthday. Also get the days between two dates.
Calculate your exact age in years, months and days from your birthdate, or the difference between any two dates. Fast, free, no sign-up.
By VOV · Last updated: October 21, 2026
How it works
The calculator uses exact date arithmetic: it subtracts year, month and day accounting for leap years and the real length of each month. It also computes total days lived and the weekday of your birth. Everything runs in your browser — your birth date never leaves your device.
Use cases
- Get your exact age in years, months, and days to fill out a US visa application form
- Find out how many days until your 30th birthday and plan the celebration in advance
- Determine your child's age in months to know which vaccines they need per the schedule
Frequently asked questions
How is exact age calculated?
We subtract your birth date from the current date adjusting calendar years, months and days, accounting for leap years.
What if I was born on February 29?
In non-leap years most systems count February 28 or March 1 as the birthday; this calculator uses February 28 for the count.
What is the between-dates mode for?
For legal deadlines, work seniority, event countdowns, or knowing how many days remain until an important date.