4 millimeters in centimeters

Result

The conversion result is: 4 millimeters is equivalent to 0.4 centimeters.[1]

Conversion formula
How to convert 4 millimeters to centimeters?

We know (by definition) that: 1 mm = 0.1 cm.

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

1 mm / 4 mm = 0.1 cm / x cm

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

x cm = (4 mm / 1 mm) * 0.1 cm → x cm = 0.4 cm

Conclusion:

4 mm = 0.4 cm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 centimeter is equal to 2.5 times 4 millimeters.

It can also be expressed as: 4 millimeters is equal to 1 / 2.5 centimeters.

Approximation

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

Footnotes

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

Results may contain small errors due to the use of floating point arithmetic.