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 42.1 millimeters into inches we have to multiply 42.1 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

42.1 mm → L_(in)

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

L_(in) = 42.1 mm × 0.039370078740157 in

L_(in) = 1.6574803149606 in

The final result is:

42.1 mm → 1.6574803149606 in

We conclude that 42.1 millimeters is equivalent to 1.6574803149606 inches:

42.1 millimeters = 1.6574803149606 inches

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 inch is equal to 0.60332541567696 × 42.1 millimeters.

Another way is saying that 42.1 millimeters is equal to 1 ÷ 0.60332541567696 inches.

Approximate result

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

42.1 mm ≅ 1.657 in

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