Free Age Calculator — Exact Age from Date of Birth
Forms, visas, insurance quotes and job applications all want an exact age — not just years. Enter a date of birth and get calendar-accurate age (years, months, days), total days and weeks lived, the weekday you were born and a live countdown to the next birthday. Leap-year safe, including February 29 birthdays.
🔒 100% Private — runs in your browser, nothing is uploadedHow to Use This Age Calculator (Step-by-Step)
- Pick the date of birth — Use the date picker or type DD-MM-YYYY.
- Click Calculate Age — Exact breakdown appears instantly.
- Copy for your form — Years, months and days match official form requirements.
Why Age Math Is Tricky — Under the Hood
Months have 28–31 days and years 365 or 366, so "years + months + days" cannot be computed by dividing seconds. The tool walks the calendar: it subtracts years, then months (rolling back a month when the day-of-month has not arrived), then counts remaining days against the previous month's actual length — the same algorithm legal and medical date systems use.
Frequently Asked Questions
How is "exact age" calculated?
Full years, then full months, then remaining days — the same method official forms expect.
Does it handle leap years?
Yes — February 29 birthdays resolve correctly every year.
Is my birth date stored anywhere?
No. Everything runs in your browser; nothing is saved or sent.