421 millimeters in centimeters

Conversion formula
How to convert 421 millimeters to centimeters?

We know (by definition) that: $1\mathrm{mm}=0.1\mathrm{cm}$

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

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

Conclusion: 421 ⁢ mm = 42.1 ⁢ cm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 centimeter is equal to 0.0237529691211401 times 421 millimeters.

It can also be expressed as: 421 millimeters is equal to $\frac{1}{\mathrm{0.0237529691211401}}$ centimeters.

Approximation

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