Age Calculator — Years, Months, Days, Hours & Birthday Countdown
Calculate your exact age from any date of birth in seconds. UtilHub's free age calculator shows your precise age broken down into years, months, weeks, days, hours, and minutes — accounting for leap years and varying month lengths. Find out how many days until your next birthday, what day of the week you were born, and calculate the age difference between any two dates. Everything runs entirely in your browser with no data sent anywhere.
Age arithmetic is less obvious than it looks, and the disagreements are real rather than rounding. Someone born on 29 February has a legal birthday of 28 February in most jurisdictions and 1 March in others, which changes their age for a day each non-leap year. Month lengths vary, so 'one month old' means something different depending on the month. This calculator counts complete years first, then complete months, then remaining days — the convention used for legal age, and the reason the result can differ from a simple division by 365.
How to use Age Calculator
- Enter your date of birth using the date picker.
- Your exact age appears instantly in years, months, days, hours, and minutes.
- See the countdown to your next birthday and the day of the week you were born.
- Set "Age on this date" to see your age on any past or future day, or switch to Age difference to compare two dates of birth.
Features
- Exact age in multiple units — Years, months, weeks, days, hours, and minutes all shown simultaneously.
- Next birthday countdown — See exactly how many days until your next birthday and what day of the week it falls on.
- Day of birth — Find out which day of the week you were born.
- Date difference calculator — Calculate the time between any two dates.
- Leap year aware — Correctly handles February 29 birthdays and all leap year calculations.
- 100% private — All calculations happen in your browser. No data is sent to any server.
Frequently Asked Questions
How do I calculate my exact age in years, months, and days?
Enter your date of birth in our age calculator. It instantly calculates your exact age broken down into years, months, and days by accounting for different month lengths and leap years. The result updates in real-time as you type.
How many days until my next birthday?
Our age calculator shows a birthday countdown automatically. After entering your date of birth, you'll see the exact number of days remaining until your next birthday, along with which day of the week it falls on.
Does the calculator account for leap years?
Yes. The calculator correctly handles leap years, including February 29 birthdays. All day counts are accurate regardless of leap year cycles. For people born on February 29, the calculator adjusts automatically for non-leap years.
How does a 29 February birthday work in a non-leap year?
It depends on the jurisdiction. Most common-law countries treat the legal birthday as 28 February, while several civil-law countries use 1 March. For everything except the exact legal boundary the difference is one day, once every four years — but if the date decides eligibility for something, check the local rule rather than trusting any calculator.
Why does my age in days differ from other calculators?
Because of how each one handles the boundaries. Dividing the elapsed days by 365.25 gives a decimal age that drifts from the calendar one. This calculator counts complete years, then complete months, then remaining days, which is the legal convention and matches how you would say your age out loud. The total-days figure is exact either way.