METRIC EQUIVALENTS OF STANDARD ROPE SIZES
NOTE: U.S. sizes designated by diameters. Circumferences shown here for comparison only.
| DIAMETER | CIRCUMFERENCE | ||
| Inches | Millimeters | Inches | Millimeters |
| 1/8 | 3.2 | 3/8 | 10.0 |
| 5/32 | 4.0 | 15/32 | 12.0 |
| 3/16 | 4.8 | 9/16 | 15.0 |
| 7/32 | 5.6 | 11/16 | 17.0 |
| 1/4 | 6.3 | 3/4 | 20.0 |
| 5/16 | 7.9 | 1 | 25.4 |
| 3/8 | 9.5 | 1 1/8 | 28.6 |
| 7/16 | 11.1 | 1 3/8 | 34.9 |
| 1/2 | 12.7 | 1 5/8 | 41.3 |
| 9/16 | 14.3 | 1 3/4 | 44.4 |
| 5/8 | 15.9 | 2 | 50.8 |
| 11/16 | 17.5 | 2 1/4 | 57.1 |
| 3/4 | 19.0 | 2 3/8 | 60.3 |
| 13/16 | 20.6 | 2 1/2 | 63.5 |
| 7/8 | 22.2 | 2 3/4 | 69.8 |
| 15/16 | 23.8 | 3 | 76.2 |
| 1 | 25.4 | 3 1/8 | 79.4 |
| 1 1/16 | 27.0 | 3 3/8 | 85.7 |
| 1 1/8 | 28.6 | 3 1/2 | 88.9 |
| 1 3/16 | 30.2 | 3 3/4 | 95.2 |
| 1 1/4 | 31.7 | 3 7/8 | 98.4 |
| 1 3/8 | 34.9 | 4 3/8 | 111.0 |
| 1 7/16 | 36.5 | 4 1/2 | 114.0 |
| 1 1/2 | 38.1 | 4 3/4 | 121.0 |
| 1 5/8 | 41.3 | 5 1/8 | 130.0 |
| 1 11/16 | 42.9 | 5 1/4 | 133.0 |
| 1 3/4 | 44.4 | 5 1/2 | 140.0 |
| 1 13/16 | 46.0 | 5 3/4 | 146.0 |
| 1 7/8 | 47.6 | 5 7/8 | 149.0 |
| 1 15/16 | 49.2 | 6 1/8 | 156.0 |
| 2 | 50.8 | 6 1/4 | 159.0 |