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18 mm = 0.7087 in
Worked example
18 ÷ 25.4 = 0.7087 inches. On a ruler marked in sixteenths, that is about 11/16″; in thirty-seconds, 23/32″; in sixty-fourths, 45/64″. The nearest 1/16 mark (11/16″ = 17.46 mm) is off by 0.54 mm.
18 mm is also 1.8 cm.
| Millimeters | Inches | Nearest 1/16 |
|---|---|---|
| 13 mm | 0.5118 | 1/2″ |
| 14 mm | 0.5512 | 9/16″ |
| 15 mm | 0.5906 | 9/16″ |
| 16 mm | 0.6299 | 5/8″ |
| 17 mm | 0.6693 | 11/16″ |
| 18 mm | 0.7087 | 11/16″ |
| 19 mm | 0.748 | 3/4″ |
| 20 mm | 0.7874 | 13/16″ |
| 21 mm | 0.8268 | 13/16″ |
| 22 mm | 0.8661 | 7/8″ |
| 23 mm | 0.9055 | 7/8″ |
Frequently asked questions
How many inches is 18 mm?
0.7087 inches, about 11/16″.
What fraction of an inch is 18 mm?
About 23/32″ to the nearest 1/32.