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Convert Inches to Millimeters

Instant, accurate inches to millimeters conversion

1 in = 25.4 mm  ·  Multiply inches by 25.4 to get millimeters

Quick Reference

InchesMillimeters
1 in25.4 mm
5 in127 mm
10 in254 mm
50 in1270 mm
100 in2540 mm

Real-World Examples

  • 1 in (1 inches) = 25.4 mm

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Frequently Asked Questions

How many millimeters are in a inche?

1 Inche = 25.4 Millimeters.

How do I convert inches to millimeters?

Multiply the value in inches by 25.4 to get millimeters. For example, 5 in × 25.4 = 127 mm.

How many inches are in a millimeter?

1 Millimeter = 0.039370079 Inches.

About Inches and Millimeters

The inch is a unit in the imperial and US customary systems, defined as exactly 25.4 millimetres.

The millimetre (1/1000 of a metre) is used in engineering, manufacturing, and precision measurements.