Leap Year Calculator

A leap year has 366 days — February gets a 29th day. The Gregorian rule corrects for Earth\

The calculator uses the standard published formula for leap year. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

Enter values in the units shown in each input field. The calculator displays results in standard units and shows the calculation steps.

The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.