Days in Month Calculator
Find how many days are in any month, leap years included.
How long is this month?
Most months are fixed, but February changes with the leap-year cycle, and the rule behind it catches people out. This tool gives the exact day count for any month and year.
February 2024 has 29 days because 2024 is a leap year; February 2100 has only 28, since century years must be divisible by 400 to qualify. Pick a month and year and the answer is immediate.
Exact and private
It computes the length from the calendar rules in your browser, so nothing you enter is uploaded.
Frequently Asked Questions
How does it handle February?
It checks the year, so February shows 29 days in a leap year and 28 otherwise.
What defines a leap year?
A year divisible by four, except century years, which must also be divisible by 400. So 2000 was a leap year but 1900 was not.
Why not just memorize it?
The rhyme works for most months, but February and the leap-year rule trip people up — this removes the doubt.
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