18 inches in decimeters

Conversion formula
How to convert 18 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: 18 ⁢ in = 4.572 ⁢ dm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 decimeter is equal to 0.218722659667542 times 18 inches.

It can also be expressed as: 18 inches is equal to $\frac{1}{\mathrm{0.218722659667542}}$ decimeters.

Approximation

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