138 millimeters in centimeters

Result

The conversion result is: 138 millimeters is equivalent to 13.8 centimeters.^[1]

Conversion formula
How to convert 138 millimeters to centimeters?

We know (by definition) that: 1 mm = 0.1 cm.

We can set up a proportion to solve for the number of centimeters.

1 mm / 138 mm = 0.1 cm / x cm

Now, we cross multiply to solve for our unknown x:

x cm = (138 mm / 1 mm) * 0.1 cm → x cm = 13.8 cm

Conclusion:

138 mm = 13.8 cm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 centimeter is equal to 0.072463768115942 times 138 millimeters.

It can also be expressed as: 138 millimeters is equal to 1 / 0.072463768115942 centimeters.

Approximation

An approximate numerical result would be: one hundred and thirty-eight millimeters is about zero centimeters, or alternatively, a centimeter is about zero point zero seven times one hundred and thirty-eight millimeters.