Date & Time
Age Calculator
Exact age in years, months, days — and days until your next birthday.
How this age calculator works
The age calculator takes the numbers you enter and applies a standard formula for this kind of calculation, showing the result instantly with no page reload. Exact age in years, months, days — and days until your next birthday.
Everything runs client-side in JavaScript, so your inputs never leave your device — there's no server, no account and no tracking involved in getting your answer.
Frequently asked questions
Months have different lengths, so the calculator borrows days from the previous calendar month when the current day-of-month is earlier than your birth day-of-month — the same way you'd count by hand.