How do you convert millimeter to inch?
To convert millimeters to inches, multiply the value by the conversion factor 0.03937007874. In this tool, 1 millimeter equals 0.03937007874 inch.
Convert mm to inches
Convert millimeters (mm) to inches (in) instantly with accurate results, reverse conversion, and a quick reference table.
Millimeter to Inch formula
Main formula: 1 millimeter = 0.03937007874 inch
Reverse formula: 1 inch = 25.4 millimeter
Use the swap button to move between both directions without retyping the number.
Millimeter
Definition: A millimeter (symbol: mm) is a metric unit of length equal to one-thousandth of a meter.
History/origin: The millimeter comes from the metric system, where the prefix "milli" means one-thousandth.
Current use: Millimeters are commonly used for small engineering tolerances, paper thickness, wiring sizes, and precise product dimensions.
Inch
Definition: An inch (symbol: in) is a unit of length in the imperial and US customary systems equal to 1/12 of a foot.
History/origin: The inch has long been used in English measurement systems and was standardized internationally at 25.4 millimeters.
Current use: Inches are often used for screens, pipe sizes, product dimensions, and small construction measurements.
Millimeter to Inch conversion table
| Millimeter [mm] | Inch [in] |
|---|---|
| 0.01 mm | 0.0003937008 in |
| 0.1 mm | 0.0039370079 in |
| 1 mm | 0.0393700787 in |
| 2 mm | 0.0787401575 in |
| 5 mm | 0.1968503937 in |
| 10 mm | 0.3937007874 in |
| 25 mm | 0.9842519685 in |
| 50 mm | 1.968503937 in |
| 100 mm | 3.937007874 in |
| 1,000 mm | 39.3700787402 in |
Convert mm to inches FAQs
What is 1 millimeter in inches?
1 millimeter is equal to 0.03937007874 inches. This page updates the result instantly when you type a number into the converter box.
What is the reverse conversion from inch to millimeter?
The reverse conversion is also available. 1 inch equals 25.4 millimeters, and you can use the swap arrows to flip the calculator instantly.
Can this mm to inches converter handle decimals and negative values?
Yes. The calculator accepts whole numbers, decimals, and negative values. It also checks for invalid text input and shows a validation message if the entry is not a valid number.
Is this mm to inches converter free to use?
Yes. This online converter is free to use and works in the browser. You can convert, clear the fields, and use the swap button without installing anything.