Conversion formula

The conversion factor from millimeters to inches is 0.039370078740157, which means that 1 millimeter is equal to 0.039370078740157 inches:

1 mm = 0.039370078740157 in

To convert 331 millimeters into inches we have to multiply 331 by the conversion factor in order to get the length amount from millimeters to inches. We can also form a simple proportion to calculate the result:

1 mm → 0.039370078740157 in

331 mm → L_(in)

Solve the above proportion to obtain the length L in inches:

L_(in) = 331 mm × 0.039370078740157 in

L_(in) = 13.031496062992 in

The final result is:

331 mm → 13.031496062992 in

We conclude that 331 millimeters is equivalent to 13.031496062992 inches:

331 millimeters = 13.031496062992 inches

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 inch is equal to 0.076737160120846 × 331 millimeters.

Another way is saying that 331 millimeters is equal to 1 ÷ 0.076737160120846 inches.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that three hundred thirty-one millimeters is approximately thirteen point zero three one inches:

331 mm ≅ 13.031 in

An alternative is also that one inch is approximately zero point zero seven seven times three hundred thirty-one millimeters.

Conversion table

millimeters to inches chart

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