Age Calculator
Calculate exact age in years, months, and days from a date of birth.
A simple subtraction of birth year from the current year gives an approximate age, but it's wrong for roughly a third of the year — anyone whose birthday hasn't yet occurred this calendar year is actually a year younger than that shortcut suggests. Getting an exact age, including months and days since the last birthday, requires proper calendar-aware date arithmetic.
This calculator takes a date of birth and computes exact age as of today, broken down into years, months, and days, plus the total number of days lived — accounting correctly for leap years and varying month lengths along the way. It's useful for age verification, legal or medical forms requiring precise age, or simply satisfying curiosity about exactly how many days you've been alive.
How to use Age Calculator
- 1
Enter your date of birth
Select the birth date using the date picker.
- 2
Read your exact age
See your age in years, months, and days, plus total days lived, calculated as of today.
Features
- Exact years, months, and days breakdown
- Total days lived counter
- Correctly accounts for leap years
- Instant live calculation as you change the date
Frequently asked questions
Common mistakes to avoid
- Using year-only subtraction for age-sensitive contexts like eligibility checks, which can be off by one year for part of the calendar year.
- Forgetting that 'total days lived' includes leap days, so it won't be a perfectly round multiple of 365 per year.
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