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Age Calculator
Free age calculator: exact age in years, months and days from date of birth, plus total weeks, days, hours and days to your next birthday.
Defaults to today
Runs in your browser. Nothing you enter is uploaded.
How to use the Age Calculator
- Pick your date of birth.
- Leave the second date as today, or choose another date.
- Read your age in years, months and days, plus total days and the next birthday.
How exact age is calculated
Age is the calendar difference between two dates. The calculator subtracts years first, then months, and borrows the length of the previous month when the day of the month is smaller. Leap years are handled automatically.
Age on a past or future date
Change the second date to find out how old someone was on a past date or will be on a future one. Useful for school cut-offs, exam eligibility, visas and insurance forms.
Fun milestones
Your 10,000th day arrives at about 27 years and 4 months. Your billionth second arrives at about 31 years and 8 months.
The date you enter stays in your browser and is never sent anywhere.
Frequently asked questions
How do I calculate my exact age?
Enter your date of birth. The calculator counts full years, then extra months and days up to today.
Can I calculate age on a future date?
Yes. Change the 'Age at the date of' field to any date.
How are leap years handled?
Automatically. The day counts use real calendar dates.
Does this store my date of birth?
No. It runs in your browser only.