Age Calculator
Calculate your exact age in years, months and days from a date of birth — plus total days lived. Free, in your browser.
🔒 Calculated in your browser — no dates are uploaded.
Work out an exact age
Enter a date of birth (and optionally a reference date, which defaults to today) to see the exact age in years, months and days, plus the total number of days. Useful for birthdays, forms, eligibility and milestones. All the date maths runs in your browser.
How it is calculated
The age is built from calendar months and days — borrowing from the previous month when needed — so it matches how people actually count age, and it accounts for different month lengths and leap years.
Frequently asked questions
Can I calculate age on a past or future date?
Yes. Change the "As of" date to any reference date and the age is computed for that day.
Does it handle leap years?
Yes. The calculation uses real calendar dates, so leap days and varying month lengths are accounted for.
Are my dates uploaded?
No. Everything is calculated locally in your browser.