Conversion formula

The conversion factor from millimeters to meters is 0.001, which means that 1 millimeter is equal to 0.001 meters:

1 mm = 0.001 m

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

1 mm → 0.001 m

400 mm → L_(m)

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

L_(m) = 400 mm × 0.001 m

L_(m) = 0.4 m

The final result is:

400 mm → 0.4 m

We conclude that 400 millimeters is equivalent to 0.4 meters:

400 millimeters = 0.4 meters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 meter is equal to 2.5 × 400 millimeters.

Another way is saying that 400 millimeters is equal to 1 ÷ 2.5 meters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that four hundred millimeters is approximately zero point four meters:

400 mm ≅ 0.4 m

An alternative is also that one meter is approximately two point five times four hundred millimeters.

Conversion table

millimeters to meters chart

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