Age Calculator
Enter a date of birth to see the exact age in years, months, and days — plus a few extra facts.
FAQ
How is exact age calculated?
Age is calculated by counting full years, months, and remaining days between the date of birth and the target date, accounting for varying month lengths and leap years — not just subtracting birth year from the current year.
Why might my age differ from a simple year subtraction?
Subtracting birth year from the current year gives the wrong answer before your birthday has happened yet in the current year, since a full year hasn't actually passed. This calculator accounts for whether the birthday has occurred yet.
Does this account for leap years?
Yes — the calculation is based on actual calendar dates, so leap years (and the extra day in February) are automatically factored into the day and week counts.
What is this useful for?
Common uses include checking eligibility ages for school, work, or legal requirements, working out exact age for medical or legal forms, or just satisfying curiosity about milestones like your 10,000th day alive.
About this tool
This calculator works out exact age in years, months, and days between any two dates, along with total days and weeks lived and a countdown to the next birthday. Everything runs instantly in your browser — no sign-up, no data stored.