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Age Calculator
Enter a date of birth to see an exact age in years, months and days, the total number of weeks and days lived, and how long until the next birthday.
How it works
The calculator counts whole years first, then whole months, then the days left over, the same way people normally state their age. If the day of the month has not been reached yet, it borrows the days from the previous month, so a birthday on the 31st is handled correctly in shorter months.
The second date defaults to today, but you can change it to find someone's age on any past or future date, such as the day of an exam, a wedding or a retirement.
Worked example
A person born on 15 May 1990 is, on 10 October 2026, 36 years, 4 months and 25 days old. That is 13,297 days or 1,899 full weeks, and their next birthday is 217 days away.
Handy uses
- Check eligibility ages for school entry, driving, voting or retirement plans.
- Find the exact age of a pet, a building or a company from its start date.
- Count the number of days between any two dates by putting the earlier date first.
- Plan milestone parties, such as 10,000 days old (about 27 years and 4 months).
Leap years
People born on 29 February have a real birthday only once every four years. In other years the calculator counts the next birthday from 1 March, which is the rule used in many countries for legal age.
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth and leave the second date as today. The result shows your age in years, months and days.
Can I find my age on a future date?
Yes. Change the second date to any date after your birth and the calculator shows how old you will be then.
How are leap years counted?
Every real calendar day is counted, so leap days are included in the total days and weeks.
Can I use it to count days between two dates?
Yes. Put the earlier date in the first box and the later date in the second, then read the total days.
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