About Age Calculator
Our free Age Calculator computes your exact age from any birth date to today — or to any custom target date you specify. It shows years, months, days, total days, total weeks, total months, next birthday countdown, and the day of the week you were born. Useful for filling in forms, calculating ages for legal purposes, or simply satisfying curiosity.
Age calculations seem simple but are surprisingly complex due to varying month lengths, leap years (February 29), and time zones. Our calculator uses the Gregorian calendar and handles all these edge cases correctly — whether you were born on a leap day, in a month with 28, 29, 30, or 31 days, or on New Year's Eve.
Use cases: calculating a child's age for school enrollment cutoff dates, determining eligibility for age-restricted services (18+ or 21+ requirements), figuring out how many days until a birthday, calculating the age of a historical figure, or simply knowing how many total days or weeks you've been alive.
How to Use the Age Calculator
Enter your date of birth
Use the date picker to select your birthdate.
Set the 'as of' date
Leave it as today for your current age, or change it to any past or future date.
Read the results
Your exact age in years/months/days, total days lived, and next birthday countdown appear instantly.
Key Features & Highlights
Common Use Cases
- Calculate exact age for official forms and applications
- Check eligibility for age-restricted services
- Calculate days until next birthday
- Determine total days alive for a milestone
- Calculate age difference between two people
- Find what day of the week you were born on
Frequently Asked Questions
We calculate complete calendar months. For example, from January 31 to March 1 is one complete month (February) plus extra days, not two months.
The tool handles leap day birthdays correctly. In non-leap years, your 'birthday' is considered to be February 28 or March 1 depending on the convention, and the tool handles this edge case accurately.
Yes, 100% free with no hidden fees, subscriptions, or account requirements.
Everything runs client-side directly inside your web browser. No files, texts, or parameters are sent to our servers.
Yes, our tools are fully responsive and work seamlessly on iPhones, iPads, Android smartphones, and tablets.