Date & Time Calculators
Date Difference Calculator
Count the exact number of elapsed days between two calendar dates.
Open calculatorDate & Time Calculators
Age Calculator
Find your age in completed years and total elapsed days between two dates.
LOCAL CALCULATION
Enter your values
Result
Your result and calculation steps will appear here.
Your calculations are processed locally and are not stored.
How to Calculate
- Enter the date of birth.
- Optionally choose a reference date; leave it empty to use today.
- Calculate to see completed years and the total number of elapsed days.
Formula
Age = completed calendar years between the birth date and reference dateExample
Someone born on January 1, 2000 is 25 completed years old on January 1, 2025.
Frequently Asked Questions
Why can age differ from simply subtracting years?
A birthday must have occurred in the reference year before another completed year is counted.
Does the calculator account for leap years?
Yes. It compares actual calendar dates and uses UTC day boundaries for total elapsed days.
Is my birth date stored?
No. The calculation runs in your browser and the entered dates are not sent to our server.