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4 mm = 0.1575 in
Worked example
4 ÷ 25.4 = 0.1575 inches. On a ruler marked in sixteenths, that is about 3/16″; in thirty-seconds, 5/32″; in sixty-fourths, 5/32″. The nearest 1/16 mark (3/16″ = 4.76 mm) is off by 0.76 mm.
4 mm is also 0.4 cm.
| Millimeters | Inches | Nearest 1/16 |
|---|---|---|
| 1 mm | 0.0394 | 1/16″ |
| 2 mm | 0.0787 | 1/16″ |
| 3 mm | 0.1181 | 1/8″ |
| 4 mm | 0.1575 | 3/16″ |
| 5 mm | 0.1969 | 3/16″ |
| 6 mm | 0.2362 | 1/4″ |
| 7 mm | 0.2756 | 1/4″ |
| 8 mm | 0.315 | 5/16″ |
| 9 mm | 0.3543 | 3/8″ |
Frequently asked questions
How many inches is 4 mm?
0.1575 inches, about 3/16″.
What fraction of an inch is 4 mm?
About 5/32″ to the nearest 1/32.