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Date & Time
Leap Year Checker
A year is a leap year if it is divisible by four, unless it is also divisible by a hundred, in which case it is only a leap year if it is divisible by four hundred. That is why 1900 was not a leap year but 2000 was.
How it works
Year
Day of the year to convert
Is it a leap year
Days in the year
Rule applied
Next leap year
Previous leap year
What that day of the year is
Days in February
Frequently asked questions
How do I use the Leap Year Checker?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.