Age Calculator
Enter a date of birth to find the exact age in years, months, and days. Also shows the next birthday countdown.
Key Takeaways & Quick Facts
Calculate exact age in years, months, and days from a date of birth.
100% Client-Side In-Browser (Zero Cloud Uploads)
Calculations tested against standard benchmarks
How to Use Age Calculator
- Enter your date of birth using the date picker.
- Optionally change the "Calculate as of" date (defaults to today).
- Click "Calculate Age" to see your exact age.
- View your age in years, months, and days, plus totals and next birthday information.
How it Works
The Age Calculator uses calendar arithmetic rather than fixed 30-day months. It correctly accounts for varying month lengths and leap years to produce an exact age in years, months, and days. It also calculates totals in months, weeks, and days, and determines how many days remain until your next birthday.
Examples
Input: Born January 1, 2000 (as of January 1, 2025)
Result: 25 years, 0 months, 0 days
Input: Born February 29, 2000 (as of March 1, 2025)
Result: 25 years, 0 months, 1 day
Input: Born July 15, 1990 (as of December 31, 2024)
Result: 34 years, 5 months, 16 days
Frequently Asked Questions
How is age calculated for someone born on February 29?
In non-leap years, the birthday is treated as February 28 for the purposes of the "next birthday" calculation. The age in years, months, and days is always computed using correct calendar arithmetic.
Does this calculator account for leap years?
Yes. The calculator uses actual calendar dates and correctly handles leap years when computing age and the number of days between dates.
Can I calculate age as of a past date?
Yes. Change the "Calculate as of" field to any date after the date of birth to see the age at that point in time.
Calculations are verified against standard mathematical and banking benchmarks. Data stays on your device in local memory.
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