How many inches are in 1 millimeter?

1 millimeter equals 0.0393701 in.

How do I convert inches back to millimeters?

Use the reverse converter: 1 inch equals 25.4 mm.

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert millimeters to inches, multiply the value by 0.0393700787.

in = mm × 0.0393700787

40 mm × 0.0393700787 = 1.57 in

Millimeter (mm): Common in engineering drawings, rainfall and small measurements in most countries. One thousandth of a metre.
Inch (in): Used for screen sizes, tools and everyday lengths in the US and UK. Since 1959 it is defined as exactly 25.4 millimetres.

How do I convert millimeters to inches?: To convert millimeters to inches, multiply the value by 0.0393700787.
How many inches are in 1 millimeter?: 1 millimeter equals 0.0393701 in.
How many inches are in 10 millimeters?: 10 mm equals 0.393701 in.
How do I convert inches back to millimeters?: Use the reverse converter: 1 inch equals 25.4 mm.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.