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 680 millimeters into centimeters we have to multiply 680 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

680 mm → L_(cm)

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

L_(cm) = 680 mm × 0.1 cm

L_(cm) = 68 cm

The final result is:

680 mm → 68 cm

We conclude that 680 millimeters is equivalent to 68 centimeters:

680 millimeters = 68 centimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 centimeter is equal to 0.014705882352941 × 680 millimeters.

Another way is saying that 680 millimeters is equal to 1 ÷ 0.014705882352941 centimeters.

Approximate result

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

680 mm ≅ 68 cm

An alternative is also that one centimeter is approximately zero point zero one five times six hundred eighty 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