Conversion formula

The conversion factor from millimeters to centimeters is 0.1, which means that 1 millimeter is equal to 0.1 centimeters:

1 mm = 0.1 cm

To convert 684 millimeters into centimeters we have to multiply 684 by the conversion factor in order to get the length amount from millimeters to centimeters. We can also form a simple proportion to calculate the result:

1 mm → 0.1 cm

684 mm → L_(cm)

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

L_(cm) = 684 mm × 0.1 cm

L_(cm) = 68.4 cm

The final result is:

684 mm → 68.4 cm

We conclude that 684 millimeters is equivalent to 68.4 centimeters:

684 millimeters = 68.4 centimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 centimeter is equal to 0.014619883040936 × 684 millimeters.

Another way is saying that 684 millimeters is equal to 1 ÷ 0.014619883040936 centimeters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred eighty-four millimeters is approximately sixty-eight point four centimeters:

684 mm ≅ 68.4 cm

An alternative is also that one centimeter is approximately zero point zero one five times six hundred eighty-four millimeters.

Conversion table

millimeters to centimeters chart

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