4 centimeters in millimeters

Result

The conversion result is: 4 centimeters is equivalent to 40 millimeters.^[1]

Conversion formula
How to convert 4 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 / 4 cm = 10 mm / x mm

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

x mm = (4 cm / 1 cm) * 10 mm → x mm = 40 mm

Conclusion:

4 cm = 40 mm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 millimeter is equal to 0.025 times 4 centimeters.

It can also be expressed as: 4 centimeters is equal to 1 / 0.025 millimeters.

Approximation

An approximate numerical result would be: four centimeters is about zero millimeters, or alternatively, a millimeter is about zero point zero three times four centimeters.