Millimetres to Inches Converter
Convert millimetres to inches instantly. Enter any mm value and see the inch equivalent live. Ideal for engineering, woodworking, and cross-system technical specifications.
Formula:[value] mm ÷ 25.4 = [result] in
How to convert Millimetres to Inches
mm ÷ 25.4 = in
For example: 20 mm ÷ 25.4 = 0.7874 in
↑ Use the converter aboveCommon Millimetres to Inches conversions
| Millimetres (mm) | Inches (in) |
|---|---|
| 1 mm | 0.03937 in |
| 5 mm | 0.1969 in |
| 10 mm | 0.3937 in |
| 12.7 mm | 0.5 in |
| 20 mm | 0.7874 in |
| 25 mm | 0.9843 in |
| 25.4 mm | 1 in |
| 50 mm | 1.969 in |
| 100 mm | 3.937 in |
| 150 mm | 5.906 in |
| 200 mm | 7.874 in |
| 300 mm | 11.81 in |
| 500 mm | 19.69 in |
About this conversion
Millimetres to inches is commonly needed when reading metric specifications and converting to imperial tool sizes or standard measurements. Because 1 inch = 25.4 mm exactly, dividing by 25.4 always gives a precise result. Common conversions: 6 mm ≈ 1/4", 10 mm ≈ 3/8", 13 mm ≈ 1/2", 19 mm ≈ 3/4", 25.4 mm = 1". Tyre dimensions, camera sensor sizes, and rainfall totals are commonly stated in millimetres but often need converting for American specifications or consumer products. Furniture assembly instructions from European manufacturers typically use millimetres, while US hardware stores stock fixings in imperial sizes.