Unit Converter Express Version🧮
Millimeters to Inches
1 millimeter = 0.03937 inches
To convert millimeters to inches, use the formula inches = millimeters ÷ 25.4. Type any value in the converter above for an instant result — everything runs in your browser.
About these units
The millimeter is the smallest commonly used metric unit of length, standard in engineering, manufacturing and medicine worldwide. The inch remains common in the US and in industries like plumbing and screens, so millimeter-to-inch conversion is routine for anyone working with international parts or specifications.
When you might need this conversion
- Converting a 6 mm drill bit to inches to match an imperial drill set
- Checking whether a 900 mm appliance fits a 36-inch kitchen gap
- Reading jewelry or watch dimensions listed in millimeters
Millimeters to Inches conversion table
| millimeters (mm) | inches (in) |
|---|---|
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.393701 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.9685 in |
| 75 mm | 2.9528 in |
| 100 mm | 3.937 in |
| 150 mm | 5.9055 in |
| 200 mm | 7.874 in |
| 300 mm | 11.811 in |
How to convert millimeters to inches
- Enter your value in the “From” box above.
- The result in inches appears instantly, using inches = millimeters ÷ 25.4.
- Swap the units any time to convert back.
Frequently asked questions
How many inches is 1 mm?
1 millimeter is about 0.03937 inches. Divide millimeters by 25.4 to convert.
How many mm are in an inch?
Exactly 25.4 millimeters make one inch.
What is 100 mm in inches?
100 millimeters is about 3.937 inches — just under 4 inches.
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