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 420 millimeters into inches we have to multiply 420 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

420 mm → L_(in)

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

L_(in) = 420 mm × 0.039370078740157 in

L_(in) = 16.535433070866 in

The final result is:

420 mm → 16.535433070866 in

We conclude that 420 millimeters is equivalent to 16.535433070866 inches:

420 millimeters = 16.535433070866 inches

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 inch is equal to 0.06047619047619 × 420 millimeters.

Another way is saying that 420 millimeters is equal to 1 ÷ 0.06047619047619 inches.

Approximate result

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

420 mm ≅ 16.535 in

An alternative is also that one inch is approximately zero point zero six times four hundred twenty 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