Age Calculator
About Age Calculator
Our free Age Calculator works out your exact age in years, months, and days from any birth date, plus fun extras like total days lived and a countdown to your next birthday.
Just enter your date of birth and an optional "as of" date to see your age at any point in time - useful for legal forms, eligibility checks, or simply satisfying your curiosity. Everything runs instantly in your browser with no sign-up required.
How to Use the Age Calculator
- Enter your date of birth.
- Leave the "as of" date set to today, or change it to calculate your age at a specific past or future date.
- Read your exact age in years, months, and days.
- Scroll down to see extra stats like total days lived and the countdown to your next birthday.
Who uses this tool: Parents use it to track a child's exact age in months for pediatric milestones, HR staff and applicants use it to confirm age eligibility for legal forms or job requirements, and people planning an event use the "as of" date option to check exactly how old someone will be on a future date. Genealogists use it while building a family tree to work out how old a relative would have been at a historical event, and curious users just enjoy checking the total-days-lived stat as a fun way to mark a milestone birthday.
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Frequently asked questions
Does this account for leap years?
Yes - the calculator works from actual calendar dates, so leap years are automatically handled correctly.
Can I calculate age as of a specific future or past date?
Yes - instead of using today's date, enter any target date to see the age as of that day (useful for eligibility checks, legal deadlines, or planning ahead).
Why do two age calculators sometimes give slightly different results?
Small differences usually come from how each tool rounds months/days - this calculator counts full elapsed years, months, and days exactly, matching how you'd count by hand on a calendar.
