Table of Long Measure
| 12 inches (in.) | = | 1 foot (ft.) |
| 3 feet | = | 1 yard (yd.) |
| 51⁄2 yards, or 161⁄2
feet | = | 1 rod (rd.) |
| 320 rods, or 5280 feet | = | 1 mile (mi.) |
| 1760 yards | = | 1 mile |
| mi. | | rd. | | yd. | | ft. | | in. |
| 1 | = | 320 | = | 1760 | = | 5280 | = | 63360 |
Architects, carpenters, and mechanics frequently write ′ for foot, and ′′ for inch. Thus 8′ 7′′ means 8 feet 7 inches.
Other measures of length are:
| 1 hand | = | 4 in. | Used in measuring the height of horses. |
| 1 fathom | = | 6 ft. | Used in measuring depths at sea. |
| 1 knot, nautical or geographical mile | = | 1.15262⁄3 miles or 6086 feet. |
The knot is used in measuring distances at sea. It is equivalent to 1 minute of longitude at the equator.
Surveyors’ Linear Measure
| 7.92 | inches | = | 1 link (l.) |
| 25 | links | = | 1 rod (rd.) |
| 4 | rods or 100 links | = | 1 chain (ch.) |
| 80 | chains | = | 1 mile (mi.) |
| mi. | | ch. | | rd. | | l. | | in. |
| 1 | = | 80 | = | 320 | = | 8000 | = | 63360 |