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Tyres > Help > Tyres Help > Convert Millimetres to Inches
Millimetres (mm) are a unit of length in the metric system, equal to one-thousandth of a metre. Millimetres are widely used for measuring small dimensions, such as the thickness of a material, the diameter of small objects, etc.
Inches (in) are a unit of length in the imperial and US customary systems of measurement. One inch is defined as 1/12 of a foot or exactly 2.54 centimetres.
To convert millimetres to inches, divide the length value in millimetres by 25.4, since one inch equals 25.4 millimetres.
There are approximately 0.0393701 inches in 1 millimetre.
The formula to convert millimetres to inches is: Inches = Millimetres / 25.4
For example, if you have a length of 10 millimetres, the equivalent in inches would be: Inches = 10 / 25.4 = 0.393701 in
Here is a table of conversions from millimetres to inches for common lengths:
| Millimetres | Inches |
| 1 | 0.0393701 |
| 5 | 0.1968504 |
| 10 | 0.3937008 |
| 15 | 0.5905512 |
| 20 | 0.7874016 |
| 25 | 0.984252 |
| 30 | 1.1811024 |
| 35 | 1.3779528 |
| 40 | 1.5748032 |
| 45 | 1.7716535 |
| 50 | 1.9685039 |
| 100 | 3.9370079 |
| 150 | 5.9055118 |
| 200 | 7.8740157 |
| 250 | 9.8425197 |
| 300 | 11.8110236 |
| 350 | 13.7795276 |
| 400 | 15.7480315 |
| 450 | 17.7165354 |
| 500 | 19.6850394 |