Convert Millimeters to Inches
Millimeters to Inches conversion table
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.393701 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.968504 in |
| 100 mm | 3.937008 in |
| 200 mm | 7.874016 in |
| 500 mm | 19.685039 in |
| 1000 mm | 39.370079 in |
How to convert millimeters to inches
Millimeters offer precise metric measurements for engineering, machining, and rainfall, while inches serve similar roles in imperial contexts. One inch equals exactly 25.4 millimeters, making the conversion straightforward but producing small decimal values in the inch direction.
Convert millimeters to inches by dividing by 25.4. Formula: inches = mm ÷ 25.4. A 10 mm bolt diameter equals 10 ÷ 25.4 = 0.394 inches (just under 3/8 inch). Sheet metal at 1.5 mm thick is 0.059 inches.
3D printing, PCB design, and firearms specifications often list tolerances in millimeters for metric audiences and inches for American markets. A 0.5 mm pencil lead is 0.020 inches wide.
Common equivalents: 25.4 mm = 1 inch, 10 mm ≈ 0.39 inch, 50 mm = 1.97 inches (about 2 inches), and 254 mm = 10 inches.
Related conversions
Frequently asked questions
25 mm ÷ 25.4 = 0.984 inches, essentially 1 inch.
Divide mm by 25.4 to get decimal inches, then convert to the nearest fraction (e.g., 0.125 = 1/8 inch). Machinists often use conversion charts for standard fractions.
1 mm = 1/25.4 ≈ 0.03937 inches, or roughly 1/25 of an inch.