Conversion formula

The conversion factor from centimeters to decimeters is 0.1, which means that 1 centimeter is equal to 0.1 decimeters:

1 cm = 0.1 dm

To convert 400 centimeters into decimeters we have to multiply 400 by the conversion factor in order to get the length amount from centimeters to decimeters. We can also form a simple proportion to calculate the result:

1 cm → 0.1 dm

400 cm → L_(dm)

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

L_(dm) = 400 cm × 0.1 dm

L_(dm) = 40 dm

The final result is:

400 cm → 40 dm

We conclude that 400 centimeters is equivalent to 40 decimeters:

400 centimeters = 40 decimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 decimeter is equal to 0.025 × 400 centimeters.

Another way is saying that 400 centimeters is equal to 1 ÷ 0.025 decimeters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that four hundred centimeters is approximately forty decimeters:

400 cm ≅ 40 dm

An alternative is also that one decimeter is approximately zero point zero two five times four hundred centimeters.

Conversion table

centimeters to decimeters chart

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