Age calculator
Your exact age on any date, from your DOB.
Open toolLeap year checker
Check a year and its number of days.
Your input stays in this browser. No account needed.
THE QUICK GUIDE
How to use leap year checker
Enter the labelled values, then process it. Copy or download the result.
How it works
Leap years are divisible by 4, except centuries unless divisible by 400.
A useful example
Year (1–9999): 2028 → 2028 is a leap year (366 days).
Good to know
Use consistent units and currency. These are general calculations; verify important results.