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Metric and U.S. Equivalents
Length
Appears in
By Bo Friberg
Published 2003
In the tables that follow, metric amounts have been rounded to the nearest tenth. These conversions should be close enough for most purposes.
| U.S. | Metric |
| 1/16 inch | 2 mm |
| ⅛ inch | 3 mm |
| 3/16 inch | 5 mm |
| ¼ inch | 6 mm |
| ⅓ inch | 8 mm |
| ⅜ inch | 9 mm |
| ½ inch | 1.2 cm |
| ⅝ inch | 1.5 cm |
| ⅔ inch | 1.6 cm |
| ¾ inch | 2 cm |
| ⅞ inch | 2.1 cm |
| 1 inch | 2.5 cm |
| 1¼ inches | 3.1 cm |
| 1½ inches | 3.7 cm |
| 1¾ inches | 4.5 cm |
| 2 inches | 5 cm |
| 2¼ inches | 5.6 cm |
| 2½ inches | 6.2 cm |
| 2¾ inches | 7 cm |
| 3 inches | 7.5 cm |
| 3¼ inches | 8.1 cm |
| 3½ inches | 8.7 cm |
| 3¾ inches | 9.5 cm |
| 4 inches | 10 cm |
| 4¼ inches | 10.6 cm |
| 4½ inches | 11.2 cm |
| 4¾ inches | 12 cm |
| 5 inches | 12.5 cm |
| 5¼ inches | 13.1 cm |
| 5½ inches | 13.7 cm |
| 5¾ inches | 14.5 cm |
| 6 inches | 15 cm |
| 6¼ inches | 15.6 cm |
| 6½ inches | 16.2 cm |
| 6¾ inches | 17 cm |
| 7 inches | 17.5 cm |
| 7¼ inches | 18.1 cm |
| 7½ inches | 18.7 cm |
| 7¾ inches | 19.5 cm |
| 8 inches | 20 cm |
| 8¼ inches | 20.6 cm |
| 8½ inches | 21.2 cm |
| 8¾ inches | 22 cm |
| 9 inches | 22.5 cm |
| 9¼ inches | 23.1 cm |
| 9½ inches | 23.7 cm |
| 9¾ inches | 24.5 cm |
| 10 inches | 25 cm |
| 10¼ inches | 25.6 cm |
| 10½ inches | 26.2 cm |
| 10¾ inches | 27 cm |
| 11 inches | 27.5 cm |
| 11¼ inches | 28.1 cm |
| 11½ inches | 28.7 cm |
| 11¾ inches | 29.5 cm |
| 12 inches (1 foot) | 30 cm |
| 12½ inches | 31.2 cm |
| 12¾ inches | 32 cm |
| 13 inches | 32.5 cm |
| 13½ inches | 33.7 cm |
| 13¾ inches | 34.5 cm |
| 14 inches | 35 cm |
| 14½ inches | 36.2 cm |
| 14¾ inches | 37 cm |
| 15 inches | 37.5 cm |
| 15½ inches | 38.7 cm |
| 15¾ inches | 39.5 cm |
| 16 inches | 40 cm |
| 16½ inches | 41.2 cm |
| 16¾ inches | 42 cm |
| 17 inches | 42.5 cm |
| 17½ inches | 43.7 cm |
| 17¾ inches | 44.5 cm |
| 18 inches (1½ feet) | 45 cm |
| 18½ inches | 46.2 cm |
| 18¾ inches | 47 cm |
| 19 inches | 47.5 cm |
| 19½ inches | 48.7 cm |
| 19¾ inches | 49.5 cm |
| 20 inches | 50 cm |
| 20½ inches | 51.2 cm |
| 20¾ inches | 52 cm |
| 21 inches | 52.5 cm |
| 21½ inches | 53.7 cm |
| 21¾ inches | 54.5 cm |
| 22 inches | 55 cm |
| 22½ inches | 56.2 cm |
| 22¾ inches | 57 cm |
| 23 inches | 57.5 cm |
| 23½ inches | 58.7 cm |
| 23¾ inches | 59.5 cm |
| 24 inches (2 feet) | 60 cm |
| 24½ inches | 61.2 cm |
| 25 inches | 62.5 cm |
| 25½ inches | 63.7 cm |
| 26 inches | 65 cm |
| 26½ inches | 66.2 cm |
| 27 inches | 67.5 cm |
| 27½ inches | 68.7 cm |
| 28 inches | 70 cm |
| 28½ inches | 71.2 cm |
| 29 inches | 72.5 cm |
| 29½ inches | 73.7 cm |
| 30 inches (2½ feet) | 75 cm |
| 30½ inches | 76.2 cm |
| 31 inches | 77.5 cm |
| 31½ inches | 78.7 cm |
| 32 inches | 80 cm |
| 32½ inches | 81.2 cm |
| 33 inches | 82.5 cm |
| 33½ inches | 83.7 cm |
| 34 inches | 85 cm |
| 34½ inches | 86.2 cm |
| 35 inches | 87.5 cm |
| 35½ inches | 88.7 cm |
| 36 inches (3 feet/1 yard) | 90 cm |
| 36½ inches | 91.2 cm |
| 37 inches | 92.5 cm |
| 37½ inches | 93.7 cm |
| 38 inches | 95 cm |
| 38½ inches | 96.2 cm |
| 39 inches | 97.5 cm |
| 39½ inches | 98.7 cm |
| 40 inches | 100 cm (1 meter) |
| 40½ inches | 1 m 1.2 cm |
| 41 inches | 1 m 2.5 cm |
| 41½ inches | 1 m 3.7 cm |
| 42 inches | 1 m 5 cm |
| 42½ inches | 1 m 6.2 cm |
| 43 inches | 1 m 7.5 cm |
| 43½ inches | 1 m 8.7 cm |
| 44 inches | 1 m 10 cm |
| 44½ inches | 1 m 11.2 cm |
| 45 inches | 1 m 12.5 cm |
| 45½ inches | 1 m 13.7 cm |
| 46 inches | 1 m 15 cm |
| 46½ inches | 1 m 16.2 cm |
| 47 inches | 1 m 17.5 cm |
| 47½ inches | 1 m 18.7 cm |
| 48 inches (4 feet) | 1 m 20 cm |