Twelve months make a year, so divide by 12. Loan terms and baby ages are often given in months.
How to use the Months to Years Converter
- Type the number of months into the Months field. Decimals such as 9 are fine.
- Read the answer in Years – it updates as you type, with no button to press.
- To convert the other way, type into Years and the months are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only month ⇄ year. Need a different unit? Use the general time converter, where you can choose any “from” and “to” unit.
How it works
Both units measure time, so they are always in the same ratio: one month (average) equals 0.083333333 years. The calculator multiplies the number of months you type by 0.083333333 to give years, and when you type into the years field it divides by the same factor to give months. Because the ratio never changes, doubling the months always doubles the years. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert months to years
- Write down the value in months, for example 18 month.
- Multiply by the conversion factor 0.083333333 (because 1 month (average) = 0.083333333 year).
- 18 × 0.083333333 = 1.5 year.
- To go back from years to months, divide by 0.083333333 – or multiply by 12.
month to year conversion table
| Months | Years | Years | Months |
|---|---|---|---|
| 1 month | 0.083333333 year | 1 year | 12 month |
| 3 month | 0.25 year | 2 year | 24 month |
| 6 month | 0.5 year | 5 year | 60 month |
| 12 month | 1 year | 10 year | 120 month |
| 18 month | 1.5 year | 20 year | 240 month |
| 24 month | 2 year | 50 year | 600 month |
| 36 month | 3 year | 100 year | 1,200 month |
| 48 month | 4 year | 1,000 year | 12,000 month |
| 60 month | 5 year | ||
| 84 month | 7 year | ||
| 120 month | 10 year | ||
| 360 month | 30 year |
What is a month?
Calendar months have 28 to 31 days. For conversions, the average Gregorian month of 30.436875 days is used.
What is a year?
A calendar year has 365 or 366 days. The average Gregorian year, 365.2425 days, accounts for the leap-year rules.
Quick mental conversion
For a fast estimate, multiply months by about 0.083 to get years; the error is about 0.4%. Use the calculator above when you need the exact figure.
Common mistakes to avoid
Treating every month as 30 days or every year as 365 days in long calculations, and writing decimal hours such as 1.5 h as 1 h 50 min (it is 1 h 30 min).
Formula
1 month = 0.083333333 year1 year = 12 monthyear = month × 0.083333333Worked example
Inputs — Months: 18 month.
Results — Years = 1.5 year.
Frequently asked questions
How many years is 18 months?
1.5 years.
How many years is a 60-month loan?
5 years.
How do I convert months to years?
Multiply the number of months by 0.083333333. For example, 18 month × 0.083333333 = 1.5 year.
How do I convert years back to months?
Divide by 0.083333333 (or multiply by 12), or simply type the value into the years field above.
What is 1 month in years?
1 month = 0.083333333 year.
What is 3 month in years?
3 month = 0.25 year.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between months and years. To pick any time unit, use the general time converter linked under Related calculators.
What formula does the Months to Years Converter use?
1 month = 0.083333333 year.