Month To Day Conversion Chart

Month (mo) Day (d)
1 mo30.417 d
2 mo60.834 d
5 mo152.085 d
10 mo304.17 d
20 mo608.34 d
40 mo1216.68 d
80 mo2433.36 d
160 mo4866.72 d
320 mo9733.44 d
640 mo19466.88 d
1280 mo38933.76 d
2560 mo77867.52 d

Convert from month to day formula

Total day = Total month x 30.417

For example, if you want to convert 20 Month to Day then,

20 mo = 20 x 30.417 = 608.34 d

Convert from day to month formula

Total month =
Total day
608.34 d
= 20 mo


A year is divided into 12 months in the modern-day Gregorian calendar. Each month has either 28, 30, or 31 days during a common year, which has 365 days. During leap years, which occur nearly every 4 years, we add an extra day, Leap Day, on 29th February, making leap years 366 days long.


The unit of measurement "day" is defined as 86,400 SI seconds and symbolized d. A day is usually 24 hours, plus or minus a possible leap second in Coordinated Universal Time (UTC), and occasionally plus or minus an hour in those locations that change from or to daylight saving time.