18 millimeters in inches

Result

The conversion result is: 18 millimeters is equivalent to 0.708661417322835 inches.[1]

Conversion formula
How to convert 18 millimeters to inches?

We know (by definition) that: 1 mm ≈ 0.039370079 in.

We can set up a proportion to solve for the number of inches.

1 mm / 18 mm ≈ 0.039370079 in / x in

Now, we cross multiply to solve for our unknown x:

x in ≈ (18 mm / 1 mm) * 0.039370079 in → x in ≈ 0.708661422 in

Conclusion:

18 mm ≈ 0.708661422 in

Conversion in the opposite direction

The inverse of the conversion factor is that 1 inch is equal to 1.41111111111111 times 18 millimeters.

It can also be expressed as: 18 millimeters is equal to 1 / 1.41111111111111 inches.

Approximation

An approximate numerical result would be: eighteen millimeters is about zero point seven one inches, or alternatively, a inch is about one point four zero times eighteen millimeters.

Footnotes

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

Results may contain small errors due to the use of floating point arithmetic.