Years to Months Converter
1 year = 12 months
A calendar year is 365 days, or 366 in a leap year. This converter uses the mean Gregorian year of 365.2425 days, which is the long-run average once leap years are included.
A month is not a fixed quantity: calendar months run from 28 to 31 days. This converter uses one twelfth of the mean Gregorian year (30.436875 days). For a specific calendar month, count the actual days.
1 year equals 12 months
How to convert years to months
A day here is a duration of 86,400 seconds. Unless explicitly labeled Julian, months and years use the mean Gregorian convention (365.2425 days per year; one twelfth per month), rather than the actual length of a particular calendar interval.
mo = yr × 12One year is 12 months, so a single multiplication converts any value.
120 mo = 10 × 12A calendar year is 365 days, or 366 in a leap year. This converter uses the mean Gregorian year of 365.2425 days, which is the long-run average once leap years are included.
A month is not a fixed quantity: calendar months run from 28 to 31 days. This converter uses one twelfth of the mean Gregorian year (30.436875 days). For a specific calendar month, count the actual days.
Years to months conversion table
Common values in years, converted to months.
| Years (yr) | Months (mo) |
|---|---|
| 1 | 12 |
| 2 | 24 |
| 5 | 60 |
| 10 | 120 |
| 15 | 180 |
| 30 | 360 |
| 60 | 720 |
| 90 | 1,080 |
| 120 | 1,440 |
About these units
yearyr
The mean Gregorian year: 365.2425 days.
monthmo
The average Gregorian month: 30.436875 days.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.