Conversion formula

The conversion factor from millimeters to inches is 0.039370078740157, which means that 1 millimeter is equal to 0.039370078740157 inches:

1 mm = 0.039370078740157 in

To convert 138 millimeters into inches we have to multiply 138 by the conversion factor in order to get the length amount from millimeters to inches. We can also form a simple proportion to calculate the result:

1 mm → 0.039370078740157 in

138 mm → L_(in)

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

L_(in) = 138 mm × 0.039370078740157 in

L_(in) = 5.4330708661417 in

The final result is:

138 mm → 5.4330708661417 in

We conclude that 138 millimeters is equivalent to 5.4330708661417 inches:

138 millimeters = 5.4330708661417 inches

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 inch is equal to 0.18405797101449 × 138 millimeters.

Another way is saying that 138 millimeters is equal to 1 ÷ 0.18405797101449 inches.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that one hundred thirty-eight millimeters is approximately five point four three three inches:

138 mm ≅ 5.433 in

An alternative is also that one inch is approximately zero point one eight four times one hundred thirty-eight millimeters.

Conversion table

millimeters to inches chart

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