# months to days

This converter makes instant conversions from months to days as time duration. To use the converter, please provide a value in the input field. The converter will begin making conversions as the values are being typed in. To add or subtract time from a date, please use our date calculator. To add, subtract, multiply, and divide time, please use our time calculator. To calculate the time between two dates, please use our days calculator.

Day, month, and year are all units of time. In everyday life, a day, a month, or a year normally refers to a calendar day, calendar month, or calendar year, which are the approximations of the time taken for the Earth to rotate about its own axis, the moon to orbit around the Earth, and the Earth to orbit around the Sun, respectively. The most widely used calendar system in the world today is the Gregorian calendar. It was first introduced in October 1852 by Pope Gregory XIII to replace the Julian calendar.

### How many days in a month?

A calendar year in the Gregorian calendar, or modern calendar, consists of 365 days in a common year or 366 days in a leap year. It has a complete leap cycle of 400 years, within which there are 97 leap years. Therefore, on average, there are = 365.2425 days in a Gregorian calendar year. In the Gregorian calendar, there are 12 calendar months in a year. Therefore, on average, there are = 30.436875 days in a calendar month.

### How to convert years to days

Based on the definition of 30.436875 days in a calendar month on average, the month to day conversion formula is:

day = 30.436875 × year

Thus, to convert from months to days, multiply a value in months by 30.436875. For example, convert 16 months to days:

16 mo = 16 × 30.436875 d = 486.99 d