Convert Millimeters to Inches

This converter turns Millimeters into Inches as you type. One millimeter equals 0.03937 in, so the result is exact, not rounded guesswork. It is handy for heights, screen sizes, furniture, clothing, DIY projects and maps.

How to convert Millimeters to Inches

Multiply the value in Millimeters by 0.03937. To convert Millimeters to Inches, use the formula below.

in = mm × 0.03937

Worked example

12 mm × 0.03937 = 0.4724 in

Quick mental estimate

For a rough figure in your head, multiply by about 0.039: 12 mm ≈ 0.468 in. Use the converter when you need the exact value.

Millimeters to Inches table

Quick reference

• 2 mm = 0.0787 in
• 10 mm = 0.3937 in
• 15 mm = 0.5906 in
• 25 mm = 0.9843 in
• 50 mm = 1.9685 in
• 100 mm = 3.937 in

Where Millimeters and Inches are used

The metric system (millimeters, centimeters, meters, kilometers) is used almost everywhere, while the United States, and partly the UK, still use inches, feet, yards and miles for everyday lengths. Product listings, construction plans and sports often mix both, which is why conversions are needed so often.

Tips

• Use the swap button to convert Inches back to Millimeters.
• Choose 0 to 6 decimals; the full-precision value is used internally.
• The side panel also shows the value in every other unit of the same type.

Why use this converter

It is free, needs no sign-up and runs entirely in your browser, so it keeps working even offline once the page is loaded. Need the opposite? Use the Inches to Millimeters converter or the full unit converter.