Age Calculator
Enter a date of birth to see the exact age in years, months and days.
100% private — every calculation runs in your browser and nothing is stored.
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The Age Calculator works out an exact age from a date of birth — in years, months and days — as of today or any date you choose. It also shows the total number of days lived. Useful for forms, eligibility checks and birthdays. It runs entirely in your browser.
Why use this calculator
Years, months and days
A precise breakdown, not just the number of years.
Any 'as of' date
Calculate age as of today or a specific future or past date.
Total days
Also shows the total number of days lived.
How to use it
Enter the date of birth
Pick the birth date from the date field.
Choose the 'as of' date
Defaults to today; change it to calculate age on any date.
See the exact age
Years, months, days and total days appear instantly.
Frequently asked questions
How is exact age calculated?+
The calculator counts complete years, then remaining complete months, then remaining days between the birth date and the target date, accounting for different month lengths and leap years.
Does it handle leap years?+
Yes. The day counts correctly account for leap years, so the total days and the day component are accurate.
Can I calculate age on a future date?+
Yes. Change the 'as of' date to any future or past date to find the age on that day — useful for eligibility cut-offs.
Is my date of birth saved?+
No. The calculation runs in your browser and nothing you enter is stored or sent anywhere.