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 18 millimeters into inches we have to multiply 18 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

18 mm → L_(in)

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

L_(in) = 18 mm × 0.039370078740157 in

L_(in) = 0.70866141732283 in

The final result is:

18 mm → 0.70866141732283 in

We conclude that 18 millimeters is equivalent to 0.70866141732283 inches:

18 millimeters = 0.70866141732283 inches

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 inch is equal to 1.4111111111111 × 18 millimeters.

Another way is saying that 18 millimeters is equal to 1 ÷ 1.4111111111111 inches.

Approximate result

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

18 mm ≅ 0.709 in

An alternative is also that one inch is approximately one point four one one times eighteen 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