138 centimeters in millimeters

Conversion formula
How to convert 138 centimeters to millimeters?

We know (by definition) that: $1\mathrm{cm}=10\mathrm{mm}$

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

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

Conclusion: 138 ⁢ cm = 1380 ⁢ mm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 millimeter is equal to 0.00072463768115942 times 138 centimeters.

It can also be expressed as: 138 centimeters is equal to $\frac{1}{\mathrm{0.00072463768115942}}$ millimeters.

Approximation

An approximate numerical result would be: one hundred and thirty-eight centimeters is about one thousand, three hundred and eighty millimeters, or alternatively, a millimeter is about zero times one hundred and thirty-eight centimeters.