Conversion formula

The conversion factor from inches to decimeters is 0.254, which means that 1 inch is equal to 0.254 decimeters:

1 in = 0.254 dm

To convert 20 inches into decimeters we have to multiply 20 by the conversion factor in order to get the length amount from inches to decimeters. We can also form a simple proportion to calculate the result:

1 in → 0.254 dm

20 in → L_(dm)

Solve the above proportion to obtain the length L in decimeters:

L_(dm) = 20 in × 0.254 dm

L_(dm) = 5.08 dm

The final result is:

20 in → 5.08 dm

We conclude that 20 inches is equivalent to 5.08 decimeters:

20 inches = 5.08 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 0.19685039370079 × 20 inches.

Another way is saying that 20 inches is equal to 1 ÷ 0.19685039370079 decimeters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty inches is approximately five point zero eight decimeters:

20 in ≅ 5.08 dm

An alternative is also that one decimeter is approximately zero point one nine seven times twenty inches.

Conversion table

inches to decimeters chart

For quick reference purposes, below is the conversion table you can use to convert from inches to decimeters