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 21 inches into decimeters we have to multiply 21 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

21 in → L_(dm)

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

L_(dm) = 21 in × 0.254 dm

L_(dm) = 5.334 dm

The final result is:

21 in → 5.334 dm

We conclude that 21 inches is equivalent to 5.334 decimeters:

21 inches = 5.334 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 0.18747656542932 × 21 inches.

Another way is saying that 21 inches is equal to 1 ÷ 0.18747656542932 decimeters.

Approximate result

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

21 in ≅ 5.334 dm

An alternative is also that one decimeter is approximately zero point one eight seven times twenty-one 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