Age Calculator
Calculate your exact age in years, months and days from your date of birth. Also see your total days lived and a countdown to your next birthday.
What is an age calculator?
An age calculator works out exactly how old you are from your date of birth, down to years, months and days. Doing this by hand is surprisingly error-prone because months have different lengths and leap years add an extra day every four years. This tool handles all of that automatically and also tells you how many total days, weeks and hours you have lived — plus a countdown to your next birthday.
How to calculate your age
- Pick your date of birth from the calendar.
- Leave the second field blank to use today's date, or set it to find your age on any past or future day.
- Press Calculate age to see your exact age and lifetime totals.
Setting a future date is useful for working out how old you will be on a wedding, graduation or retirement date.
Why exact age matters
Precise age comes up more often than you would think: visa and pension eligibility, school admission cut-offs, insurance pricing, medical dosing and legal milestones all depend on an accurate figure. Parents love tracking a baby's age in weeks and months, while others simply enjoy seeing the total number of days they have been alive. Because the calculation accounts for leap years, the result is reliable even across decades.
Frequently Asked Questions
How does the age calculator handle leap years?
It compares the two real calendar dates directly, so the extra day in February during leap years is always included in the total.
Can I calculate age for a future date?
Yes. Set the second date to any day in the future to see how old you will be then.
Does it work for any date of birth?
Yes, as long as the birth date is on or before the end date. It works for any year your device's calendar supports.
Is my date of birth stored?
No. The calculation runs in your browser and nothing is recorded or shared.