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 421 millimeters into inches we have to multiply 421 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

421 mm → L_(in)

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

L_(in) = 421 mm × 0.039370078740157 in

L_(in) = 16.574803149606 in

The final result is:

421 mm → 16.574803149606 in

We conclude that 421 millimeters is equivalent to 16.574803149606 inches:

421 millimeters = 16.574803149606 inches

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 inch is equal to 0.060332541567696 × 421 millimeters.

Another way is saying that 421 millimeters is equal to 1 ÷ 0.060332541567696 inches.

Approximate result

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

421 mm ≅ 16.575 in

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