Age Calculator
Exact age, or the time between any two dates
Free Age Calculator — Find Your Exact Age Online
Our age calculator lets you calculate your exact age, or the interval between two dates, in years, months, weeks, days, hours, minutes and seconds. It also shows your next birthday countdown and the weekday you were born. It is fast, accurate and works on all devices, including mobile phones and tablets.
Quick answer: enter your date of birth and the calculator gives your age as of today. Someone born on March 15, 1990 is 36 years, 6 months and 18 days old on October 3, 2026, which is 13,351 days.
How Age Is Calculated
The calculator counts whole years from the date of birth, then whole months, then the days that are left. Total weeks, hours, minutes and seconds are worked out from the number of days between the two dates, so every figure on the page agrees with the others.
| Result | How it is worked out |
|---|---|
| Years, months, days | Whole years from the birth date, then whole months, then the days left over |
| Total days | The number of days between the two dates |
| Total weeks | Total days ÷ 7, rounded down |
| Hours, minutes, seconds | Total days × 24, × 1,440 and × 86,400 |
A year is about 365.25 days, or roughly 8,766 hours, so a 30-year-old has lived close to 10,957 days. Because the calculator uses calendar dates rather than clock times, hours, minutes and seconds are counted from midnight to midnight.
Calculate the Interval Between Two Dates
The second date field works for any date, not only today. Pick a past date to see how old someone was on a given day, or a future date to find out how old you will be on a birthday, retirement date or the start of school. You can also use two ordinary dates, such as a start and an end, to see the exact time between them. To add or subtract time, or to count working days, use the date calculator.
Next Birthday and Birth Weekday
The calculator shows how many days remain until your next birthday and which weekday you were born on. If you were born on February 29, your birthday is counted on February 28 in years that are not leap years, which follows the same month-end rule as our other date tools.
What Is an Age Calculator Used For?
People use an age calculator to check eligibility for school admission, retirement or insurance, to plan milestone birthdays and celebrations, to fill in forms, to help with homework and projects, or just for curiosity. This calculator uses the international standard of counting completed years. Some traditions, such as East Asian age reckoning, count a person as one year old at birth, so the numbers can differ from those systems. Official age rules vary by country, so check the exact requirement for legal matters. For a birthday countdown with more detail, try the birthday calculator.
How to Use This Age Calculator
Select your date of birth
Use the date picker on your device, or type the date.
Choose a target date (optional)
Leave it as today, or pick any past or future date to see the age on that day.
Click "Calculate Age"
Your exact age and next birthday countdown appear instantly.