About the Age Calculator
The Age Calculator performs a calendar-aware year, month and day subtraction and separately measures total elapsed days. It accounts for differing month lengths and leap years.
How to use the Age Calculator
- Enter the birth or start date.
- Choose the date on which age should be measured.
- Calculate the calendar age and next-birthday timing.
Practical tips
- Use the local civil dates shown on official documents.
- For legal age questions, follow the relevant jurisdiction's rule.