## Conversion formula How to convert 120 days to months?

We know (by definition) that:1d≈0.032854911mo

We can set up a proportion to solve for the number of months.

Now, we cross multiply to solve for our unknown x:

Conclusion:120d≈3.94258932mo

## Conversion in the opposite direction

The inverse of the conversion factor is that **1 month is equal to 0.253640415820139 times 120 days**.

It can also be expressed as: 120 days is equal to 1 0.253640415820139 months.

## Approximation

An approximate numerical result would be: **one hundred and twenty days is about three point nine four months**, or alternatively, *a month is about zero point two five times one hundred and twenty days*.

## Units involved

This is how the units in this conversion are defined:

### Days

"A day is a unit of time. In common usage, it is either an interval equal to 24 hours or daytime, the consecutive period of time during which the Sun is above the horizon. The period of time during which the Earth completes one rotation with respect to the Sun is called a solar day. Several definitions of this universal human concept are used according to context, need and convenience. In 1960, the second was redefined in terms of the orbital motion of the Earth, and was designated the SI base unit of time. The unit of measurement day, redefined in 1960 as 86 400 SI seconds and symbolized d, is not an SI unit, but is accepted for use with SI. A civil day is usually 86 400 seconds, 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."

### Months

"A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates. The traditional concept arose with the cycle of moon phases; such months (lunations) are synodic months and last approximately 29.53 days. From excavated tally sticks, researchers have deduced that people counted days in relation to the Moons phases as early as the Paleolithic age. Synodic months, based on the Moon s orbital period with respect to the Earth-Sun line, are still the basis of many calendars today, and are used to divide the year."

## Footnotes

<1> The precision is 15 significant digits (fourteen digits to the right of the decimal point).