Age Calculator
Calculate exact age or the time between any two dates.
Enter a birth date (or any start date) and an 'as of' date, and get the exact difference in years, months, and days, plus totals in days and weeks. Useful for age verification, calculating someone's exact age for a form, or measuring the gap between two arbitrary dates. All calculation happens locally in your browser.
Runs on your device. This tool processes your file inside this browser tab. Nothing is uploaded, so it also works offline once the page has loaded, and closing the tab discards the file from memory.
Loading tool
How it works
- 01
Enter the birth date or start date.
- 02
Enter the 'as of' date (defaults to today).
- 03
Read the age breakdown and totals.
Details
- Category
- Developer & data
- Runs
- In your browser
- Files uploaded
- No
- Cost per run
- Free
- Sign-in
- Not required
- Works offline
- Yes, once loaded
Last updated 2026-08-12
Common questions
Does it account for different month lengths?
Yes - the day/month/year breakdown borrows from the calendar month correctly, so results match how people count age by hand.
Can I use it for something other than age?
Yes - set any two dates to get the duration between them, not just birth dates.
Use this from your code
This tool is also a REST endpoint, so you can run it in a pipeline instead of by hand. It is free and needs no API key. See the API reference for every parameter.
curl -X POST https://fileoven.com/api/v1/tools/age-calculator \
-H "Content-Type: application/json" \
-d '{"from":"2000-01-01"}'