## 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 8.1 centimeters into millimeters we have to multiply 8.1 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

8.1 cm → L(mm)

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

L(mm) = 8.1 cm × 10 mm

L(mm) = 81 mm

The final result is:

8.1 cm → 81 mm

We conclude that 8.1 centimeters is equivalent to 81 millimeters:

8.1 centimeters = 81 millimeters

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.012345679012346 × 8.1 centimeters.

Another way is saying that 8.1 centimeters is equal to 1 ÷ 0.012345679012346 millimeters.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that eight point one centimeters is approximately eighty-one millimeters:

8.1 cm ≅ 81 mm

An alternative is also that one millimeter is approximately zero point zero one two times eight point 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)
9.1 centimeters 91 millimeters
10.1 centimeters 101 millimeters
11.1 centimeters 111 millimeters
12.1 centimeters 121 millimeters
13.1 centimeters 131 millimeters
14.1 centimeters 141 millimeters
15.1 centimeters 151 millimeters
16.1 centimeters 161 millimeters
17.1 centimeters 171 millimeters
18.1 centimeters 181 millimeters