Months to Years Converter

How to convert months to years

1 month = 0.0833333333 years. To convert months to years, divide by 12 (or multiply by 0.0833333333). An average calendar month is one twelfth of a 365-day year, about 30.4 days (4.35 weeks); real months run 28 to 31 days. A common calendar year is 365 days (a leap year has 366; the average Julian year is 365.25).

Worked examples

• 18 months = 1.5 yr (18 ÷ 12)
• 60 months = 5 yr (60 ÷ 12)
• 360 months = 30 yr (360 ÷ 12)

Where this conversion comes up

Months are used for rent, subscriptions, pregnancy, contracts and project plans; years for ages, contracts and interest periods. Loan terms, contract lengths and ages of toddlers are given in months. Twelve months make one year, so 360 months (a 30-year mortgage) is exactly 30 years and 18 months is 1.5 years, or 1 year 6 months.

Quick estimate

Divide by 12: 84 months = 7 years. For the remainder, 7 months is 0.58 years.

Common mistakes

• Multiplying instead of dividing. A year is larger than a month, so the number of years must come out smaller: 18 months = 1.5 yr.
• Ignoring leap years. This page uses 365-day years. For an exact calendar span between two dates, count the leap days (one every four years) or use 365.25 days per year.
• Rounding too early. Keep the full factor until the last step; rounding 0.0833 to 0.083 first puts large values noticeably off.

Related time converters: minutes to hours, hours to minutes, seconds to minutes, minutes to seconds, seconds to hours, hours to seconds.