Length converter
Convert Millimeters to Thousandths of an Inch (mm to thou)
1 mm = 39.3701 thou. Tolerances and coating thickness, where a thou is 0.001 inch.
Millimeters to thousandths of an inch conversion table
| mm | thou |
|---|---|
| 0.001 mm | 0.03937 thou |
| 0.002 mm | 0.07874 thou |
| 0.005 mm | 0.19685 thou |
| 0.01 mm | 0.393701 thou |
| 0.02 mm | 0.787402 thou |
| 0.025 mm | 0.984252 thou |
| 0.03 mm | 1.1811 thou |
| 0.04 mm | 1.5748 thou |
| 0.05 mm | 1.9685 thou |
| 0.06 mm | 2.3622 thou |
| 0.075 mm | 2.9528 thou |
| 0.08 mm | 3.1496 thou |
| 0.1 mm | 3.937 thou |
| 0.12 mm | 4.7244 thou |
| 0.125 mm | 4.9213 thou |
| 0.15 mm | 5.9055 thou |
| 0.2 mm | 7.874 thou |
| 0.25 mm | 9.8425 thou |
| 0.3 mm | 11.811 thou |
| 0.4 mm | 15.748 thou |
| 0.5 mm | 19.685 thou |
| 0.6 mm | 23.622 thou |
| 0.75 mm | 29.5276 thou |
| 0.8 mm | 31.4961 thou |
| 1 mm | 39.3701 thou |
| 1.2 mm | 47.2441 thou |
| 1.5 mm | 59.0551 thou |
| 2 mm | 78.7402 thou |
| 2.5 mm | 98.4252 thou |
| 3 mm | 118.11 thou |
| 4 mm | 157.48 thou |
| 5 mm | 196.85 thou |
| 6 mm | 236.22 thou |
| 8 mm | 314.961 thou |
| 10 mm | 393.701 thou |
| 12 mm | 472.441 thou |
| 15 mm | 590.551 thou |
| 20 mm | 787.402 thou |
| 25 mm | 984.252 thou |
How to convert millimeters to thousandths of an inch
Multiply the value in millimeters by 39.3701 to get thousandths of an inch. 1 mm equals 39.3701 thou, and 1 thou equals 0.0254 mm.
About these units
The millimeter is one thousandth of a meter and the default dimension unit on metric engineering drawings. Machined tolerances are commonly quoted in hundredths of a millimeter.
A thou (or mil) is one thousandth of an inch, written 0.001 in. Machinists quote fits, shim sizes, and coating thicknesses in thou.
Common questions
How many thousandths of an inch are in a millimeter?
1 mm equals 39.3701 thou.
How do you convert millimeters to thousandths of an inch?
Use thou = mm ÷ 0.0254. So 1 mm = 39.3701 thou, and to go back, 1 thou = 0.0254 mm.
What is 0.1 mm in thou?
0.1 mm equals 3.937 thou.
What is 0.5 mm in thou?
0.5 mm equals 19.685 thou.
What is 1 mm in thou?
1 mm equals 39.3701 thou.