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8 mm = 0.315 in
Worked example
8 ÷ 25.4 = 0.315 inches. On a ruler marked in sixteenths, that is about 5/16″; in thirty-seconds, 5/16″; in sixty-fourths, 5/16″. The nearest 1/16 mark (5/16″ = 7.94 mm) is off by 0.06 mm.
8 mm is also 0.8 cm.
| Millimeters | Inches | Nearest 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″ |
| 10 mm | 0.3937 | 3/8″ |
| 11 mm | 0.4331 | 7/16″ |
| 12 mm | 0.4724 | 1/2″ |
| 13 mm | 0.5118 | 1/2″ |
Frequently asked questions
How many inches is 8 mm?
0.315 inches, about 5/16″.
What fraction of an inch is 8 mm?
About 5/16″ to the nearest 1/32.