Free Age Calculator — Exact Age in Years & Days Online
Calculate your exact age in years, months, and days — plus days until your next birthday. Works entirely in your browser.
Exact Age
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Total Days
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Next Birthday
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How it works
Enter date of birth
Pick your birth date from the date picker or type it in.
Set the reference date
By default it uses today. Change it to calculate age at any past or future date.
Read your exact age
See years, months, days, total days lived, and your next birthday countdown.
Private by design
Your birth date stays in your browser tab. Nothing is ever uploaded.
Common use cases
Age verification
Quickly confirm someone's exact age for legal, medical, or administrative purposes.
Birthday planning
Find out exactly how many days until an upcoming birthday or milestone age.
Historical events
Calculate how old someone was at a specific date in the past.
Medical & legal forms
Get precise age in years and months for forms that require exact age information.
Frequently asked questions
How is the age calculated?
The calculator uses JavaScript Date arithmetic to find the exact difference between two dates in years, months, and remaining days.
Can I calculate age at a past date?
Yes — change the "As of" date to any date in the past to see how old someone was at that point.
Does it account for leap years?
Yes — the underlying Date API handles leap years automatically.
What date format should I use?
Use the browser's date picker — it handles the correct format for your locale automatically.
Is this free?
Yes, completely free with no account or signup required.
Is my birth date stored?
No — everything runs locally in your browser. Your date is never transmitted.