Rod (rd)
The rod (also called the perch or pole) is an imperial unit of length equal to 16.5 feet, 5.5 yards, or 5.0292 meters. Once essential to English land surveying and agriculture, the rod defined the width of an acre and was used in hedgerow spacing and field layout. Though obsolete in everyday use, it survives in historical land records and property descriptions.
Definition
One rod equals exactly 16.5 feet, 5.5 yards, one-fourth of a chain, one-fortieth of a furlong, 5.0292 meters, or 198 inches. There are 320 rods in a mile. The rod is synonymous with the perch and pole - all three terms refer to the same length. In historical land measurement, the square rod (also called the square perch or square pole) equals approximately 25.29 square meters.
History
The rod has its roots in medieval English agriculture, where it represented the length of an ox goad - the stick used to drive a plough team. It was also defined as the combined length of the left feet of 16 men leaving church on a Sunday, according to one 16th-century description. England standardized the rod at 16.5 feet (5.5 yards). The rod's importance lay in its role as a building block: 40 rods make a furlong, 4 rods make a chain, and one rod wide by one furlong long is one rood (quarter-acre). Metrication rendered it obsolete for most purposes.
Common Uses
The rod survives in historical property descriptions and land records in the US and UK, particularly in rural areas where boundaries were set centuries ago. Some fishing regulations in England specify that anglers must be spaced a certain number of "pegs" or "perches" apart, though meters are now more common. The rod occasionally appears in crossword puzzles, trivia, and historical education. Understanding rods is essential for anyone working with pre-metric land surveys or old property deeds.
Did You Know? Facts About Rod
- The rod was supposedly standardized by lining up 16 men's left feet end-to-end as they left church - averaging out individual foot sizes.
- The rod, perch, and pole are three names for the identical length of 16.5 feet.
- A cricket pitch (22 yards) is exactly 4 rods long.
- 40 rods to a furlong, 8 furlongs to a mile - so there are 320 rods in one mile.
- The rod is one of the few units whose length was defined by committee (literally, a row of men's feet) rather than by a king's body measurement.