Millimeters to Thou (Mils) (mm → th)
Formula
1 mm = 39.37007874015748 thConversion Table
| mm | th |
|---|---|
| 0 | 0 |
| 1.0000 | 39.370 |
| 2.0000 | 78.740 |
| 3.0000 | 118.11 |
| 4.0000 | 157.48 |
| 5.0000 | 196.85 |
| 6.0000 | 236.22 |
| 7.0000 | 275.59 |
| 8.0000 | 314.96 |
| 9.0000 | 354.33 |
| 10.000 | 393.70 |
| 11.000 | 433.07 |
| 12.000 | 472.44 |
| 13.000 | 511.81 |
| 14.000 | 551.18 |
| 15.000 | 590.55 |
| 16.000 | 629.92 |
| 17.000 | 669.29 |
| 18.000 | 708.66 |
| 19.000 | 748.03 |
| mm | th |
|---|---|
| 20.000 | 787.40 |
| 21.000 | 826.77 |
| 22.000 | 866.14 |
| 23.000 | 905.51 |
| 24.000 | 944.88 |
| 25.000 | 984.25 |
| 26.000 | 1,023.6 |
| 27.000 | 1,063.0 |
| 28.000 | 1,102.4 |
| 29.000 | 1,141.7 |
| 30.000 | 1,181.1 |
| 31.000 | 1,220.5 |
| 32.000 | 1,259.8 |
| 33.000 | 1,299.2 |
| 34.000 | 1,338.6 |
| 35.000 | 1,378.0 |
| 36.000 | 1,417.3 |
| 37.000 | 1,456.7 |
| 38.000 | 1,496.1 |
| 39.000 | 1,535.4 |
| mm | th |
|---|---|
| 40.000 | 1,574.8 |
| 41.000 | 1,614.2 |
| 42.000 | 1,653.5 |
| 43.000 | 1,692.9 |
| 44.000 | 1,732.3 |
| 45.000 | 1,771.7 |
| 46.000 | 1,811.0 |
| 47.000 | 1,850.4 |
| 48.000 | 1,889.8 |
| 49.000 | 1,929.1 |
| 50.000 | 1,968.5 |
| 51.000 | 2,007.9 |
| 52.000 | 2,047.2 |
| 53.000 | 2,086.6 |
| 54.000 | 2,126.0 |
| 55.000 | 2,165.4 |
| 56.000 | 2,204.7 |
| 57.000 | 2,244.1 |
| 58.000 | 2,283.5 |
| 59.000 | 2,322.8 |
| mm | th |
|---|---|
| 60.000 | 2,362.2 |
| 61.000 | 2,401.6 |
| 62.000 | 2,440.9 |
| 63.000 | 2,480.3 |
| 64.000 | 2,519.7 |
| 65.000 | 2,559.1 |
| 66.000 | 2,598.4 |
| 67.000 | 2,637.8 |
| 68.000 | 2,677.2 |
| 69.000 | 2,716.5 |
| 70.000 | 2,755.9 |
| 71.000 | 2,795.3 |
| 72.000 | 2,834.6 |
| 73.000 | 2,874.0 |
| 74.000 | 2,913.4 |
| 75.000 | 2,952.8 |
| 76.000 | 2,992.1 |
| 77.000 | 3,031.5 |
| 78.000 | 3,070.9 |
| 79.000 | 3,110.2 |
Millimeters to Thou (Mils) Conversion
Converting Millimeters (mm) to Thou (Mils) (th) is a common length conversion. 1 mm equals 39.370079 th. For example, 100 mm is equal to 3,937.007874 th.
Quick Mental Math: Millimeters to Thou (Mils)
Reference a linear anchor between millimeters and thou; use one memorable value.
Why is converting Millimeters to Thou (Mils) tricky?
Magnitude or direction confusion between millimeters and thou is the primary error source.
Quick Reference Values
1 mm = 39.370079 th. 5 mm = 196.850394 th. 10 mm = 393.700787 th. 25 mm = 984.251969 th. 50 mm = 1,968.503937 th. 100 mm = 3,937.007874 th.
What is Millimeters?
Millimeters (mm) is a unit of length. A millimeter (mm) is a unit of length equal to one-thousandth of a meter, the SI base unit of length. It measures small distances and thicknesses with precision in engineering, manufacturing, and construction [bipm-si-brochure]. One millimeter equals exactly 0.001 meters or 10^-3 meters. The meter was defined in 1793 during the French Revolution, with the millimeter introduced as a decimal subdivision in the metric system. International standards bodies like BIPM later formalized its exact value to maintain global uniformity [bipm-si-brochure]. Millimeters are used worldwide in technical drawings, engineering specifications, and everyday measurements such as clothing and manufacturing tolerances. ISO standards mandate millimeter precision in many industrial applications [iso-80000].
What is Thou (Mils)?
Thou (Mils) (th) is a unit of length. A thou is a unit of length equal to one thousandth of an inch (0.001 in). It corresponds to exactly 25.4 micrometers (µm) in SI units. The thou is widely used in engineering and manufacturing for precise measurements of thickness and diameter [nist-si-guide]. The thou emerged in the 19th century in British engineering as a convenient subdivision of the inch. Its use was formalized to provide accuracy in machining and toolmaking, reflecting industrial measurement needs [nist-si-guide]. The thou remains common in the United States, Canada, and the UK for mechanical engineering and machining tolerances. It is frequently used in the automotive and aerospace industries for component specifications [nist-si-guide].
Common Misspellings
People often search for this conversion using these alternate spellings: milimeters, milimeter, millimter, mm, thow, thouh, thous. All of these refer to the Millimeters to Thou (Mils) conversion.