MM to Inches Converter
Convert millimeters to inches (mm to in) instantly with our free online converter. Accurate conversion results for millimeters to inches.
All length units in one place — try the unified converter→How to convert millimeters to inches?
To convert millimeters to inches, divide the number of millimeters by 25.4. This is because 1 inch equals exactly 25.4 millimeters.
d(in) = d(mm) / 25.4
Example
Convert 100 millimeters to inches:
d(in) = 100mm / 25.4 = 3.93701in
How many inches in a millimeter?
There are approximately 0.0393701 inches in one millimeter.
1mm = 0.0393701in
1mm = 0.0393701in
How many millimeters in an inch?
There are exactly 25.4 millimeters in one inch.
1in = 25.4mm
1in = 25.4mm

What is a Millimeter?
A millimeter is a unit of length in the metric system. It is one thousandth of a meter. Millimeters are commonly used for measuring small objects and precise dimensions in engineering, manufacturing, and science.
What is an Inch?
An inch is a unit of length in the imperial and US customary systems of measurement. It is equal to 1/12 of a foot or 1/36 of a yard. The inch is commonly used in the United States, Canada, and the United Kingdom.
Popular millimeters to inches conversion table
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 mm | 0.0393701 in |
| 5 mm | 0.196850 in |
| 10 mm | 0.393701 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 25.4 mm | 1 in |
| 50 mm | 1.96850 in |
| 100 mm | 3.93701 in |
| 150 mm | 5.90551 in |
| 200 mm | 7.87402 in |
| 250 mm | 9.84252 in |
| 254 mm | 10 in |
| 300 mm | 11.81102 in |
| 500 mm | 19.68504 in |
| 1000 mm | 39.37008 in |
| 1500 mm | 59.05512 in |
| 2000 mm | 78.74016 in |
| 2500 mm | 98.42520 in |
| 3000 mm | 118.11024 in |
| 5000 mm | 196.85040 in |
