Toolman

18 millimeters to inches

18 millimeters = 0.708661 inches

Rounded to a practical precision: 0.71 in.

How the calculation works

One millimeter is 0.0393701 inches, so:

18 mm × 0.0393701 = 0.708661 in

Reversing it, 0.708661 inches ÷ 0.0393701 returns 18 millimeters.

Nearby values

MillimetersInches
14 mm0.551181 in
15 mm0.590551 in
16 mm0.629921 in
17 mm0.669291 in
18 mm0.708661 in
19 mm0.748031 in
20 mm0.787402 in
21 mm0.826772 in
22 mm0.866142 in

About these units

Millimeter (mm) — A millimetre is one thousandth of a metre and is the default unit on engineering drawings and rulers.

Inch (in) — An inch is exactly 25.4 millimetres and is used for screen sizes, pipe diameters and paper dimensions.

Frequently asked questions

How many inches is 18 millimeters?

18 millimeters is 0.708661 inches.

How do I convert millimeters to inches myself?

Multiply by 0.0393701. To go back, divide by 0.0393701 — or multiply by 25.4.

Is this figure exact?

The conversion factor between the millimeter and the inch is fixed by definition. The figure above is rounded for readability; the converter carries full precision.

Convert other values

Full millimeters to inches converter · All length converters