# Conversion from Year (yr) to Month (mo) and vice versa

Updated on by Stefan Banse

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

A year (a) (Latin: annus) forms the time span of 365 days, or in the case of a leap year, 366 consecutive days. Due to its varying length, the year is not a physical unit of time and thus not a unit of time in the international SI system of units.

In the time unit converter, a year is always calculated to be 365 days.

In astronomical terms, a year is defined as the duration of the Earth’s orbit around the Sun, which lasts 365.25 days on average. Due to the quarter of a day, a normal calendar year (common year) is defined as 365 days, which is replaced every four years by a leap year with 366 days.

In everyday life, the term "year" is understood to mean the period from 1st January to 31st December.

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 defined: Since a year comprises 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 is a little more than 28 days on average.

## Basis for conversion Year (yr) to Month (mo) and vice versa

The abbreviation for the "Time unit Year" is yr. The abbreviation for the "Time unit Month" is mo.

## Formula for the conversion of Year (yr) to Month (mo) and vice versa

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

Conversion formula Year to Month

Determine the number of Month from Year

Year × 12

## Formula for the conversion of Month (mo) to Year (yr)

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

Conversion formula Month to Year

Determine the number of Year from Month

Month × 0.083333333333333

## Overview table: How many Year are how many Month?

Year yr ⇒ Month mo
0.01 yr  are  0.12000 mo
0.02 yr  are  0.24000 mo
0.03 yr  are  0.36000 mo
0.04 yr  are  0.48000 mo
0.05 yr  are  0.60000 mo
0.06 yr  are  0.72000 mo
0.07 yr  are  0.84000 mo
0.08 yr  are  0.96000 mo
0.09 yr  are  1.08000 mo
0.10 yr  are  1.20000 mo
0.20 yr  are  2.40000 mo
0.30 yr  are  3.60000 mo
0.40 yr  are  4.80000 mo
0.50 yr  are  6 mo
0.60 yr  are  7.20000 mo
0.70 yr  are  8.40000 mo
0.80 yr  are  9.60000 mo
0.90 yr  are  10.80000 mo
1 yr  corresponds to  12 mo
2 yr  are  24 mo
3 yr  are  36 mo
4 yr  are  48 mo
5 yr  are  60 mo
6 yr  are  72 mo
7 yr  are  84 mo
8 yr  are  96 mo
9 yr  are  108 mo
10 yr  are  120 mo
20 yr  are  240 mo
30 yr  are  360 mo
40 yr  are  480 mo
50 yr  are  600 mo
60 yr  are  720 mo
70 yr  are  840 mo
80 yr  are  960 mo
90 yr  are  1 080 mo
100 yr  are  1 200 mo
200 yr  are  2 400 mo
300 yr  are  3 600 mo
400 yr  are  4 800 mo
500 yr  are  6 000 mo
600 yr  are  7 200 mo
700 yr  are  8 400 mo
800 yr  are  9 600 mo
900 yr  are  10 800 mo
1 000 yr  are  12 000 mo

## Overview table: How many Month are how many Year?

Month mo ⇒ Year yr
0.01 mo  are  0.00083 yr
0.02 mo  are  0.00166 yr
0.03 mo  are  0.00250 yr
0.04 mo  are  0.00333 yr
0.05 mo  are  0.00416 yr
0.06 mo  are  0.00500 yr
0.07 mo  are  0.00583 yr
0.08 mo  are  0.00666 yr
0.09 mo  are  0.00750 yr
0.10 mo  are  0.00833 yr
0.20 mo  are  0.01666 yr
0.30 mo  are  0.02500 yr
0.40 mo  are  0.03333 yr
0.50 mo  are  0.04166 yr
0.60 mo  are  0.05000 yr
0.70 mo  are  0.05833 yr
0.80 mo  are  0.06666 yr
0.90 mo  are  0.07500 yr
1 mo  corresponds to  0.08333 yr
2 mo  are  0.16666 yr
3 mo  are  0.25000 yr
4 mo  are  0.33333 yr
5 mo  are  0.41666 yr
6 mo  are  0.50000 yr
7 mo  are  0.58333 yr
8 mo  are  0.66666 yr
9 mo  are  0.75000 yr
10 mo  are  0.83333 yr
20 mo  are  1.66666 yr
30 mo  are  2.50000 yr
40 mo  are  3.33333 yr
50 mo  are  4.16666 yr
60 mo  are  5 yr
70 mo  are  5.83333 yr
80 mo  are  6.66666 yr
90 mo  are  7.50000 yr
100 mo  are  8.33333 yr
200 mo  are  16.66666 yr
300 mo  are  25 yr
400 mo  are  33.33333 yr
500 mo  are  41.66666 yr
600 mo  are  50 yr
700 mo  are  58.33333 yr
800 mo  are  66.66666 yr
900 mo  are  75 yr
1 000 mo  are  83.33333 yr

## 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