Days in a Month Calculator

How to use it

1. 1

   Pick the month

   Choose the month you want to check.

2. 2

   Enter the year

   Type the year, which matters for February in leap years.

3. 3

   Read the answer

   See the number of days and the weekdays the month starts and ends on.

When it comes in handy

Frequently asked questions

How many days are in each month?

Seven months have 31 days: January, March, May, July, August, October and December. Four have 30 days: April, June, September and November. February has 28 days, or 29 in a leap year. The calculator returns the exact count for the year you choose.

How many days are in February?

February has 28 days in a common year and 29 days in a leap year. A leap year is one that divides by 4, except for century years, which must also divide by 400. Enter a year and the calculator applies this rule for you.

Why does the calculator ask for a year?

Because February changes length between common and leap years, and because the weekday a month starts on depends on the year. Giving a year lets the calculator return both the correct day count and the right start and end weekdays.

How accurate is the calculation?

The maths is done day by day using the real calendar, so leap years, the different lengths of months, and year boundaries are all handled correctly rather than approximated. There is no "30-day month" rounding, which is where many quick estimates go wrong, so the result matches what you would get counting on a calendar.