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 40 millimeters into inches we have to multiply 40 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

40 mm → L_(in)

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

L_(in) = 40 mm × 0.039370078740157 in

L_(in) = 1.5748031496063 in

The final result is:

40 mm → 1.5748031496063 in

We conclude that 40 millimeters is equivalent to 1.5748031496063 inches:

40 millimeters = 1.5748031496063 inches

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 inch is equal to 0.635 × 40 millimeters.

Another way is saying that 40 millimeters is equal to 1 ÷ 0.635 inches.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that forty millimeters is approximately one point five seven five inches:

40 mm ≅ 1.575 in

An alternative is also that one inch is approximately zero point six three five times forty 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