What is the actual rule for a leap year?

Divisible by 4, except century years (divisible by 100) — unless that century year is also divisible by 400. So 2000 was a leap year, but 1900 was not.

Why does this matter?

A leap year has 366 days instead of 365, with February 29th added — relevant for date math, billing cycles and anything counting days per year.

Leap Year Checker

Check whether any year is a leap year, using the exact Gregorian calendar rule.

Year

2026 is not a leap year

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FAQ

What is the actual rule for a leap year?: Divisible by 4, except century years (divisible by 100) — unless that century year is also divisible by 400. So 2000 was a leap year, but 1900 was not.
Why does this matter?: A leap year has 366 days instead of 365, with February 29th added — relevant for date math, billing cycles and anything counting days per year.