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Inches to Millimeters Converter

Convert inches to millimeters, with the same length in centimeters, meters and feet.

What this tool does

Convert inches to millimeters, with the same length in centimeters, meters and feet. Type an amount in inches, choose the units, and the tool converts it to millimeters. It offers 5 length units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Inch, Millimeter, Centimeter, Meter, Foot. Starts as Inch.
  • To: Choose one of the same 5 units as "From". Starts as Millimeter.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from inches to millimeters:

  • 1 in = 25.4 mm
  • 5 in = 127 mm
  • 10 in = 254 mm
  • 50 in = 1,270 mm
  • 100 in = 2,540 mm

Multiply the number of inches by 25.4 to get millimeters. Both units are exact definitions, so 25.4 is the exact factor: 1 in = 25.4 mm.

Sources: Inch: International yard and pound agreement, 1959. Millimeter: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes).

Limitations

  • Converts the unit of a length only. It does not work out a length from other measurements.
  • Uses international inches and feet, which are defined exactly in metric units.
  • Enter inches as a decimal number such as 0.5, not as a fraction such as 1/2.

FAQs

Q: How many millimeters are in one inch?
A: One inch is 25.4 mm. Enter any value and the converter scales it for you.
Q: How do I convert millimeters to inches?
A: Choose millimeter in the From box and inch in the To box. One millimeter is about 0.0393701 in.

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