Calculate Average Month Length

Convert days and month. A calculator for the average length of months in a normal year and a leap year. A month doesn't have an exact length, but can have 28, 29, 30 or 31 days. 7 months have 31 days, 4 months have 30 days and February has 28 days in a normal year and 29 days in a leap year. So, if a number of months is given without an exact period of time, an average month length has to be estimated. This can be calculated here. Please select normal, average or leap year. An average year has 365.2421875 days. Then enter a number of months or days to calculate the other value.

Example: 200 days are a bit more than six and a half months. A difference between normal and leap year shows at the decimal places.