Exact Age Calculator
Enter a birth date and this pins down your age to the exact year, month and day — or your age on any date you choose. Alongside it you'll see total months, weeks and days lived, a countdown to your next birthday, and even the weekday you were born on. It works from local calendar dates, so there are no timezone surprises.
- 100% free
- Private & safe
- Runs in your browser
Why use Age Calculator?
Age Calculator works out the answer precisely from local calendar dates, so there are no timezone or daylight-saving surprises.
- Runs instantly in your browser — nothing to install, nothing uploaded.
- Completely free, with no account, no watermarks and no usage limits.
- Exact age = years / months / days between two local dates
- Enter your date of birth.
- Works on any device — desktop, tablet and phone — and is fully keyboard accessible.
What it can do — and its limits
- Calculates exact age in years, months and days between a birth date and any target date.
- Shows the countdown to the next birthday.
- Runs in your browser using your local calendar.
How to use Age Calculator
- Enter your date of birth.
- Optionally set a different 'calculate age on' date; it defaults to today.
- See your age broken down into years, months and days, with correct leap-year handling.
- Review totals, your next-birthday countdown and the day of the week you were born.
Examples
- Finding out you are 34 years, 2 months and 11 days old today.
- Calculating how old someone will be on a future event date.
Worked example
Input
Born 15 May 1990, measured on 6 August 2026.
Output
36 years, 2 months and 22 days old.
Supported formats & limits
- Exact age = years / months / days between two local dates
Limitations
- Birth dates cannot be in the future, and the comparison date cannot be before the birth date.
- Calendar quirks such as Feb 29 birthdays follow standard conventions.
Common problems & fixes
Off by a day around midnight.
Ages use calendar dates in your local timezone — pick the dates explicitly rather than relying on 'today'.
Leap-year birthday (29 Feb).
In non-leap years it's counted from 28 Feb/1 Mar depending on convention; verify against your own rule.
Frequently asked questions
Do you store my date of birth?
No. The calculation runs in your browser and your date of birth is never saved or uploaded.
Are leap years handled?
Yes. The difference is computed on real calendar dates, so leap years and month lengths are accurate.
Can I calculate age between two past dates?
Yes. Set the 'calculate age on' date to any date on or after the birth date.