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Age Calculator
Enter your date of birth to see your exact age in years, months and days — plus total weeks, days, hours, and a countdown to your next birthday.
Work out your exact age in seconds
This age calculator tells you precisely how old you are — not just in years, but the exact years, months and days since you were born. It also breaks your age down into total months, weeks, days and hours, and counts down to your next birthday. Everything is calculated privately in your browser.
It's handy for filling in forms, checking eligibility, planning birthdays and milestones, or just satisfying curiosity. You can also set the "age at date" field to any date — past or future — to find how old you were, or will be, then.
How the calculation works
- We count the number of full years between your birth date and the target date.
- Then the remaining months, then the remaining days.
- Different month lengths and leap years are handled automatically, so the result is exact.
Frequently asked questions
Is my date of birth stored or uploaded?
No. The entire calculation runs in your browser. Nothing is sent to a server or saved.
Can I calculate age at a future or past date?
Yes. Change the "Age at date" field to any date and the result updates to your age on that day.
Does it account for leap years?
Yes. The day and month counts correctly handle leap years and months of different lengths.