Age Calculator
Calculate your exact age in years, months, and days from your date of birth, plus total weeks, days, hours, and next birthday.
About the Age Calculator
Our free age calculator works out your exact age from your date of birth. Enter your birth date and an optional "age at" date, and instantly see your age in years, months, and days, along with the totals in months, weeks, days, and hours. It also counts down the days to your next birthday. The date math runs entirely in your browser, accounting for leap years and varying month lengths. Perfect for birthdays, forms, eligibility checks, and curiosity.
Features
- Exact age in years, months, and days
- Totals in months, weeks, days, and hours
- Countdown to your next birthday
- Age at any chosen date, not just today
- Accounts for leap years and month lengths
- 100% private — browser-only date math
How to use this tool
The Age Calculator works right in your browser — no signup, no installation. Follow these steps:
- Enter your date of birth.
- Leave "age at date" as today, or change it to any date.
- Read your exact age and the totals instantly.
- Check the days remaining until your next birthday.
Frequently asked questions
How is exact age calculated?
The calculator counts full years from your birth date, then the remaining months, then the leftover days — accounting for leap years and that months have different lengths. This matches how age is normally counted.
Can I find my age on a future or past date?
Yes. Change the "age at date" field to any date to see how old you were, or will be, then.
Is my date of birth stored anywhere?
No. All calculations happen in your browser. Your date of birth is never uploaded, logged, or stored.
How are month ends handled?
Complete months use calendar anniversaries clamped to the last day of a shorter month. For example, January 31 to March 1 is one month and one day in a non-leap year. Days and hours are calendar totals, with hours calculated as days × 24.
Using the results
Use the Age Calculator to calculate from the values you enter. Check the displayed units, rounding and supported inputs when interpreting the result.