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Unit Converter

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 20 centimeters into millimeters we have to multiply 20 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

20 cm → L(mm)

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

L(mm) = 20 cm × 10 mm

L(mm) = 200 mm

The final result is:

20 cm → 200 mm

We conclude that 20 centimeters is equivalent to 200 millimeters:

20 centimeters = 200 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.005 × 20 centimeters.

Another way is saying that 20 centimeters is equal to 1 ÷ 0.005 millimeters.

Approximate result

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

20 cm ≅ 200 mm

An alternative is also that one millimeter is approximately zero point zero zero five times twenty 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)
21 centimeters 210 millimeters
22 centimeters 220 millimeters
23 centimeters 230 millimeters
24 centimeters 240 millimeters
25 centimeters 250 millimeters
26 centimeters 260 millimeters
27 centimeters 270 millimeters
28 centimeters 280 millimeters
29 centimeters 290 millimeters
30 centimeters 300 millimeters