Length converter
Convert Thousandths of an inch to Millimeters (thou to mm)
1 thou = 0.0254 mm. Tolerances and coating thickness, where a thou is 0.001 inch.
Thousandths of an inch to millimeters conversion table
| thou | mm |
|---|---|
| 1 thou | 0.0254 mm |
| 2 thou | 0.0508 mm |
| 5 thou | 0.127 mm |
| 10 thou | 0.254 mm |
| 20 thou | 0.508 mm |
| 50 thou | 1.27 mm |
| 100 thou | 2.54 mm |
How to convert thousandths of an inch to millimeters
Multiply the value in thousandths of an inch by 0.0254 to get millimeters. 1 thou equals 0.0254 mm, and 1 mm equals 39.3701 thou.
About these units
A thou (or mil) is one thousandth of an inch, written 0.001 in. Machinists quote fits, shim sizes, and coating thicknesses in thou.
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.
Common questions
How many millimeters are in a thousandths of an inch?
1 thou equals 0.0254 mm.
How do you convert thousandths of an inch to millimeters?
Multiply the value in thousandths of an inch by 0.0254 to get millimeters. 1 thou equals 0.0254 mm, and 1 mm equals 39.3701 thou.