Age Calculator
Calculate exact age in years, months, and days from a birth date.
About this tool
Forms ask for age; you have a birth date. This free age calculator computes years, months, and days from a date of birth. Enter the DOB, get an exact age locally, and avoid off-by-one mistakes around birthdays—no spreadsheet formulas required.
How to use
- Enter the date of birth.
- Optionally set an as-of date if not calculating for today.
- Calculate to see years, months, and days.
- Use the result in your form, record, or planning note.
Frequently asked questions
Yes—date math uses calendar rules so February 29 edge cases are handled more carefully than naive day counts.