Conversion formula

The conversion factor from months to years is 0.083333333333333, which means that 1 month is equal to 0.083333333333333 years:

1 mo = 0.083333333333333 yr

To convert 21 months into years we have to multiply 21 by the conversion factor in order to get the time amount from months to years. We can also form a simple proportion to calculate the result:

1 mo → 0.083333333333333 yr

21 mo → T_(yr)

Solve the above proportion to obtain the time T in years:

T_(yr) = 21 mo × 0.083333333333333 yr

T_(yr) = 1.75 yr

The final result is:

21 mo → 1.75 yr

We conclude that 21 months is equivalent to 1.75 years:

21 months = 1.75 years

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 year is equal to 0.57142857142857 × 21 months.

Another way is saying that 21 months is equal to 1 ÷ 0.57142857142857 years.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one months is approximately one point seven five years:

21 mo ≅ 1.75 yr

An alternative is also that one year is approximately zero point five seven one times twenty-one months.

Conversion table

months to years chart

For quick reference purposes, below is the conversion table you can use to convert from months to years