20 inches in decimeters

Conversion formula
How to convert 20 inches to decimeters?

We know (by definition) that: $1\mathrm{in}=0.254\mathrm{dm}$

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

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

Conclusion: 20 ⁢ in = 5.08 ⁢ dm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 decimeter is equal to 0.196850393700787 times 20 inches.

It can also be expressed as: 20 inches is equal to $\frac{1}{\mathrm{0.196850393700787}}$ decimeters.

Approximation

An approximate numerical result would be: twenty inches is about zero decimeters, or alternatively, a decimeter is about zero point two zero times twenty inches.