Age Calculator

Calculating an exact age sounds simple, but most tools get it slightly wrong. The correct method counts complete calendar years, then the remaining complete months, then the remaining days — accounting for the fact that months have different lengths (28–31 days) and that leap years add an extra day in February.

The "Calculate As Of" field lets you calculate your age on any date — not just today. This is useful for legal purposes (how old were you on a specific date?), historical curiosity, or planning ahead (how old will I be when I retire?). Simply change the date and the calculation updates instantly.

All calculations run entirely in your browser. Your date of birth is never sent to a server, stored, or shared. The tool works offline once the page is loaded.

Whether you need your exact age for an official form, want to know how many days you've been alive, or just got curious about how old you'll be on your next birthday — our Age Calculator gives you the answer in seconds. Enter any date of birth, and it calculates your age down to the day, including the sometimes-tricky leap year math. No signup, no app to download, works on any device.

Enter your date of birth and the calculator instantly returns your exact age in years, months, and days — plus the total number of days you've been alive. It handles leap years automatically and can also calculate the exact age difference between any two people. Advanced mode lets you set a future or past date to see exactly how old someone will be (or was) on that specific date.

Common uses include filling out official government or medical forms that require exact age, calculating eligibility criteria for driving, voting, retirement or insurance, finding out how many days old a baby is for milestone photos, and running age difference calculations between partners, friends, or family members.

Most age calculators online either round to the nearest year or give you a vague answer like "29 years old." Ours gives you the precision version: 29 years, 7 months, and 14 days — plus the total day count. It runs entirely in your browser, no data is sent anywhere, and there's no limit on how many calculations you can run.