How to convert years to months
To convert a measurement in years to months, multiply the value by 12. The conversion factor comes from the relationship between both units and the second.
For example, to convert 5 yr to months: 5 × 12 = 60 mo.
What is a year?
A year here is the average Gregorian year, equal to 365.2425 days (31,556,952 seconds), the value that keeps the calendar aligned with the seasons. The Gregorian calendar, introduced in 1582, uses an average year of 365.2425 days achieved through its leap-year rules, refining the older Julian year of 365.25 days.
Common uses of years include: Interest and investment calculations; Age and anniversary tracking; Warranty and contract periods; Astronomical and historical timelines.
What is a month?
A month here is the average Gregorian calendar month, equal to about 30.44 days (2,629,746 seconds) — one twelfth of an average year. The month originates from the lunar cycle (about 29.5 days), but calendar months were adjusted to fit the solar year. Because real months range from 28 to 31 days, an average length is used for conversions.
Common uses of months include: Loan and subscription billing; Rent and salary periods; Long-term project planning; Age and milestone tracking.
Years to months worked examples
Here are some common values converted:
1 yr = 12 mo 5 yr = 60 mo 10 yr = 120 mo 50 yr = 600 mo 100 yr = 1,200 mo
Frequently asked questions
How many months are in one year?
One year (yr) equals 12 months (mo). Multiply any value in years by 12 to convert to months.
How do I convert years to months?
Multiply the value in years by 12. For example, 5 yr × 12 = 60 mo.
How do I convert months to years?
Multiply the value in months by 0.083333333333, or divide by 12. Use the swap button on the converter above to reverse the direction.
Is the year to month conversion exact?
Fixed units (second through week) are exact. Month and year use the average Gregorian calendar length (30.44 and 365.2425 days) since these vary in practice.
What is the formula for years to months?
The formula is: mo = yr × 12. This comes from the definition of both units relative to the second.