How to convert inches to mm
- Type the value in in in the “Value” field.
- See the result in mm, highlighted at the top.
- You also see the same value in the other units of the category.
- Tap Copy result to take the equivalents with you.
The formula and examples
1 in equals 25.4 mm, and 1 mm equals 0.03937 in. To convert, multiply the in value by 25.4: 1 in = 25.4 mm; 2 in = 50.8 mm; 12 in = 304.8 mm.
Multiply the inches by 25.4: one inch is exactly 25.4 mm.
in × 25.4 = mm
mm × 0.039370079 = in
Inches (in) to Millimeters (mm) conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.5 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 6 | 152.4 |
| 7 | 177.8 |
| 8 | 203.2 |
| 9 | 228.6 |
| 10 | 254 |
| 11 | 279.4 |
| 12 | 304.8 |
| 14 | 355.6 |
| 15 | 381 |
| 16 | 406.4 |
| 18 | 457.2 |
| 20 | 508 |
| 21.1 | 535.94 |
| 25 | 635 |
| 30 | 762 |
| 35 | 889 |
| 40 | 1,016 |
| 42.195 | 1,071.75 |
| 45 | 1,143 |
| 50 | 1,270 |
| 55 | 1,397 |
| 60 | 1,524 |
| 65 | 1,651 |
| 70 | 1,778 |
| 75 | 1,905 |
| 80 | 2,032 |
| 90 | 2,286 |
| 100 | 2,540 |
| 110 | 2,794 |
| 120 | 3,048 |
| 125 | 3,175 |
| 130 | 3,302 |
| 140 | 3,556 |
| 150 | 3,810 |
| 160 | 4,064 |
| 170 | 4,318 |
| 175 | 4,445 |
| 180 | 4,572 |
| 190 | 4,826 |
| 200 | 5,080 |
| 250 | 6,350 |
| 300 | 7,620 |
| 400 | 10,160 |
| 500 | 12,700 |
| 750 | 19,050 |
| 1,000 | 25,400 |
Millimeters (mm) to Inches (in) conversion table
| Millimeters (mm) | Inches (in) |
|---|---|
| 0.5 | 0.019685 |
| 1 | 0.0393701 |
| 2 | 0.0787402 |
| 3 | 0.11811 |
| 4 | 0.15748 |
| 5 | 0.19685 |
| 6 | 0.23622 |
| 7 | 0.275591 |
| 8 | 0.314961 |
| 9 | 0.354331 |
| 10 | 0.393701 |
| 11 | 0.433071 |
| 12 | 0.472441 |
| 14 | 0.551181 |
| 15 | 0.590551 |
| 16 | 0.629921 |
| 18 | 0.708661 |
| 20 | 0.787402 |
| 21.1 | 0.830709 |
| 25 | 0.984252 |
| 30 | 1.1811 |
| 35 | 1.37795 |
| 40 | 1.5748 |
| 42.195 | 1.66122 |
| 45 | 1.77165 |
| 50 | 1.9685 |
| 55 | 2.16535 |
| 60 | 2.3622 |
| 65 | 2.55906 |
| 70 | 2.75591 |
| 75 | 2.95276 |
| 80 | 3.14961 |
| 90 | 3.54331 |
| 100 | 3.93701 |
| 110 | 4.33071 |
| 120 | 4.72441 |
| 125 | 4.92126 |
| 130 | 5.11811 |
| 140 | 5.51181 |
| 150 | 5.90551 |
| 160 | 6.29921 |
| 170 | 6.69291 |
| 175 | 6.88976 |
| 180 | 7.08661 |
| 190 | 7.48031 |
| 200 | 7.87402 |
| 250 | 9.84252 |
| 300 | 11.811 |
| 400 | 15.748 |
| 500 | 19.685 |
| 750 | 29.5276 |
| 1,000 | 39.3701 |
Good to know
- The factor is 25.4 mm for every in.
- The result is rounded to 8 significant digits.
- Below you will find a conversion chart in both directions.
Frequently asked questions
How much is 1 in in mm?
25.4 mm.
How much is 2 in in mm?
50.8 mm.
How many in are in 1 mm?
0.03937 in.
How do I convert inches to mm in my head?
Multiply the inches by 25.4: one inch is exactly 25.4 mm.