Convert months to years

One month equals 0.083333 years. To convert any number of months to years, multiply by 0.08333333.

The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.

Time conversions are exact down to the day and approximate above it. Seconds, minutes, hours and days have fixed ratios, but a month has no fixed length and a year has two — 365 days in the calendar and 365.25 in the astronomical convention used here. For anything with legal or contractual weight, count the actual calendar dates rather than converting a duration, because the difference accumulates precisely where it is least welcome.

months to years formula

To go the other way, use month = year ÷ 0.08333333.

About these units

A month has no fixed length, so conversions use the average Gregorian month of 30.44 days. For anything contractual, count calendar dates rather than converting.

This uses the Julian year of 365.25 days, the astronomical convention. A calendar year is 365 or 366 days depending on leap years.

Month is also written months and mos. Year is also written years and yrs.

Sources

1. International Astronomical Union, Resolution B2 (2012), XXVIII General Assembly — the astronomical unit as exactly 149,597,870,700 m, and the Julian year of 365.25 days from which the light year and parsec follow.