Conversion from Month (mo) to Day (d) and vice versa

Updated on by Stefan Banse

Here you can convert the Unit of time Month into the unit Day and vice versa you can convert Day into Month. By clicking the "Swap units" icon, you will always obtain the desired conversion in the calculation result, i.e., mo to d or d to mo. With the following calculator you can also calculate any other Unit of time.

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Info about "Month"

A month forms the time span of 28, 29, 30 or 31 consecutive days. Due to its varying length, the month is not a physical unit of time and thus not a unit of time in the international SI system of units.

To enable a general conversion, e.g. into seconds, minutes or years, the average length of the month in days is is defined: Since a year consists of 12 months, a normal calendar year with 365 days results in a month length of 365 / 12 = 30,416667 days

In astronomical terms, a month is defined as the period of one complete revolution of the moon. Depending on the definition, the lunar month averages a little more than 28 days.

Info about "Day"

Although the day (d) (Latin: dies) is not part of the International SI System of Units, it is indirectly approved for use with the SI through its definition that a day has 24 hours of 60 minutes a 60 seconds, is indirectly permitted for use with the SI. This is because the second forms the official SI base value.

Thereby 1 day equals 24 × 60 = 86,400 seconds 1 second therefore equals 0.0000115741 days.

For thousands of years, the astronomical day, i.e. the time from sunrise to sunrise again, was the historical basic unit for time. The first reliable time measurements were made by the Egyptians in daylight using sundials, which they divided into 12 units according to their usual system of twelve numbers. according to their usual twelve-number system. At night, they used the position of 12 stars to measure the time at night. It was not yet so important that days were longer in summer than in winter. Basically, the day and the night were divided into twelve time periods. It was only later, a good 2,000 years ago, that Greek astronomers divided the day into hours of equal length.

The day as the basis for time was not replaced by the second until the middle of the 20th century. It was proven, among other things, by means of modern quartz clocks that the astronomical day, i.e. one revolution of the Earth, is constantly becoming somewhat slower. This confirmed the assumption that, for example, magma shifts beneath the earth's mantle and also the tides slow down the Earth's rotation. Therefore, since 1956, the second has been defined in such a way that it is measured by an atomic clock and a leap second must be added to the calendar year every 2 to 5 years. This is why a day that is actually 86,400.003 atomic seconds long, is always 86,400 seconds long, and from time to time it has a one-off 86,401 seconds.

Basis for conversion Month (mo) to Day (d)

The abbreviation for the "Unit of time Month" is mo. The abbreviation for the "Unit of time Day" is d.

Formula for the conversion of Month (mo) to Day (d)

The calculation from Month to Day shall be made using the following conversion formula:

 Conversion formula Month to Day 

Determine the number of Day from Month

Month × 30.416666650899


Formula for the conversion of Day (d) to Month (mo)

The calculation from Day to Month shall be made using the following conversion formula:

 Conversion formula Day to Month 

Determine the number of Month from Day

Day × 0.03287671234581


Overview table: How many Month are how many Day?

Month moDay d
0.01 mo => 0.30416 d
0.02 mo => 0.60833 d
0.03 mo => 0.91250 d
0.04 mo => 1.21666 d
0.05 mo => 1.52083 d
0.06 mo => 1.82500 d
0.07 mo => 2.12916 d
0.08 mo => 2.43333 d
0.09 mo => 2.73750 d
0.10 mo => 3.04166 d
0.20 mo => 6.08333 d
0.30 mo => 9.12500 d
0.40 mo => 12.16666 d
0.50 mo => 15.20833 d
0.60 mo => 18.25000 d
0.70 mo => 21.29166 d
0.80 mo => 24.33333 d
0.90 mo => 27.37500 d
1 mo => 30.41666 d
2 mo => 60.83333 d
3 mo => 91.25000 d
4 mo => 121.66666 d
5 mo => 152.08333 d
6 mo => 182.50000 d
7 mo => 212.91666 d
8 mo => 243.33333 d
9 mo => 273.75000 d
10 mo => 304.16666 d
20 mo => 608.33333 d
30 mo => 912.50000 d
40 mo => 1 216.66666 d
50 mo => 1 520.83333 d
60 mo => 1 824.99999 d
70 mo => 2 129.16666 d
80 mo => 2 433.33333 d
90 mo => 2 737.49999 d
100 mo => 3 041.66666 d
200 mo => 6 083.33333 d
300 mo => 9 124.99999 d
400 mo => 12 166.66666 d
500 mo => 15 208.33332 d
600 mo => 18 249.99999 d
700 mo => 21 291.66665 d
800 mo => 24 333.33332 d
900 mo => 27 374.99998 d
1 000 mo => 30 416.66665 d

Overview table: How many Day are how many Month?

Day dMonth mo
0.01 d => 0.00032 mo
0.02 d => 0.00065 mo
0.03 d => 0.00098 mo
0.04 d => 0.00131 mo
0.05 d => 0.00164 mo
0.06 d => 0.00197 mo
0.07 d => 0.00230 mo
0.08 d => 0.00263 mo
0.09 d => 0.00295 mo
0.10 d => 0.00328 mo
0.20 d => 0.00657 mo
0.30 d => 0.00986 mo
0.40 d => 0.01315 mo
0.50 d => 0.01643 mo
0.60 d => 0.01972 mo
0.70 d => 0.02301 mo
0.80 d => 0.02630 mo
0.90 d => 0.02958 mo
1 d => 0.03287 mo
2 d => 0.06575 mo
3 d => 0.09863 mo
4 d => 0.13150 mo
5 d => 0.16438 mo
6 d => 0.19726 mo
7 d => 0.23013 mo
8 d => 0.26301 mo
9 d => 0.29589 mo
10 d => 0.32876 mo
20 d => 0.65753 mo
30 d => 0.98630 mo
40 d => 1.31506 mo
50 d => 1.64383 mo
60 d => 1.97260 mo
70 d => 2.30137 mo
80 d => 2.63013 mo
90 d => 2.95890 mo
100 d => 3.28767 mo
200 d => 6.57534 mo
300 d => 9.86301 mo
400 d => 13.15068 mo
500 d => 16.43835 mo
600 d => 19.72602 mo
700 d => 23.01369 mo
800 d => 26.30137 mo
900 d => 29.58904 mo
1 000 d => 32.87671 mo

Source information

As source for the information in the "Time units" category, we have used in particular:

Last update on April 24, 2021

The last changes in the "Time units" category were implemented by Stefan Banse on April 24, 2021. The main changes were:

  • April 24, 2021: Publication of the time units converter.
  • Editorial revision of all texts in this category