## 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 42.1 centimeters into millimeters we have to multiply 42.1 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

42.1 cm → L(mm)

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

L(mm) = 42.1 cm × 10 mm

L(mm) = 421 mm

The final result is:

42.1 cm → 421 mm

We conclude that 42.1 centimeters is equivalent to 421 millimeters:

42.1 centimeters = 421 millimeters

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.002375296912114 × 42.1 centimeters.

Another way is saying that 42.1 centimeters is equal to 1 ÷ 0.002375296912114 millimeters.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that forty-two point one centimeters is approximately four hundred twenty-one millimeters:

42.1 cm ≅ 421 mm

An alternative is also that one millimeter is approximately zero point zero zero two times forty-two 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)
43.1 centimeters 431 millimeters
44.1 centimeters 441 millimeters
45.1 centimeters 451 millimeters
46.1 centimeters 461 millimeters
47.1 centimeters 471 millimeters
48.1 centimeters 481 millimeters
49.1 centimeters 491 millimeters
50.1 centimeters 501 millimeters
51.1 centimeters 511 millimeters
52.1 centimeters 521 millimeters