31 centimeters in inches

Conversion formula
How to convert 31 centimeters to inches?

We know (by definition) that: $1\mathrm{cm}\approx 0.39370079\mathrm{in}$

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

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

Conclusion: 31 ⁢ cm ≈ 12.20472449 ⁢ in

Conversion in the opposite direction

The inverse of the conversion factor is that 1 inch is equal to 0.0819354838709677 times 31 centimeters.

It can also be expressed as: 31 centimeters is equal to $\frac{1}{\mathrm{0.0819354838709677}}$ inches.

Approximation

An approximate numerical result would be: thirty-one centimeters is about twelve point one nine inches, or alternatively, a inch is about zero point zero eight times thirty-one centimeters.