## Conversion formula

The conversion factor from centimeters to millimeters is 10, which means that 1 centimeter is equal to 10 millimeters:

1 cm = 10 mm

To convert 31 centimeters into millimeters we have to multiply 31 by the conversion factor in order to get the length amount from centimeters to millimeters. We can also form a simple proportion to calculate the result:

1 cm → 10 mm

31 cm → L(mm)

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

L(mm) = 31 cm × 10 mm

L(mm) = 310 mm

The final result is:

31 cm → 310 mm

We conclude that 31 centimeters is equivalent to 310 millimeters:

31 centimeters = 310 millimeters

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.0032258064516129 × 31 centimeters.

Another way is saying that 31 centimeters is equal to 1 ÷ 0.0032258064516129 millimeters.

## Approximate result

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

31 cm ≅ 310 mm

An alternative is also that one millimeter is approximately zero point zero zero three times thirty-one centimeters.

## Conversion table

### centimeters to millimeters chart

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

centimeters (cm) millimeters (mm)
32 centimeters 320 millimeters
33 centimeters 330 millimeters
34 centimeters 340 millimeters
35 centimeters 350 millimeters
36 centimeters 360 millimeters
37 centimeters 370 millimeters
38 centimeters 380 millimeters
39 centimeters 390 millimeters
40 centimeters 400 millimeters
41 centimeters 410 millimeters