20 centimeters in millimeters

Result

The conversion result is: 20 centimeters is equivalent to 200 millimeters.^[1]

Conversion formula
How to convert 20 centimeters to millimeters?

We know (by definition) that: 1 cm = 10 mm.

We can set up a proportion to solve for the number of millimeters.

1 cm / 20 cm = 10 mm / x mm

Now, we cross multiply to solve for our unknown x:

x mm = (20 cm / 1 cm) * 10 mm → x mm = 200 mm

Conclusion:

20 cm = 200 mm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 millimeter is equal to 0.005 times 20 centimeters.

It can also be expressed as: 20 centimeters is equal to 1 / 0.005 millimeters.

Approximation

An approximate numerical result would be: twenty centimeters is about two hundred millimeters, or alternatively, a millimeter is about zero point zero one times twenty centimeters.