Rod (rd)

US & ImperialTraditional unit (still used in some regions)

16.5 feet or 5.5 yards (5.0292 m), also called a pole or perch. A quarter of a chain; a basic unit of English land measurement.

1 rod = 5.0292 meters (exactly).

About the rod

Three names, rod, pole and perch, all describe the same stick. Perch comes from the Roman pertica, a ten-foot measuring pole of about 2.96 m, while rod and pole name the physical staff that farmers and surveyors carried. A statute from around the thirteenth or fourteenth century defined the perch as five and a half ells. In the thirteenth century English perches ranged from 18 to 24 feet, and a parliamentary report of 1820 still found lengths between 16.5 and 25 feet in local use.

The version that won out is 16.5 feet, or 5.5 yards, exactly 5.0292 m, which is the figure used here. It is a quarter of a chain, 40 to a furlong and 320 to a mile, and 160 square rods make an acre. Ireland kept a longer perch of 21 feet. The rod faded from legal use in the UK with metrication from 1965, but allotments are still measured in square poles, canoeists count portages in rods, and pipeline easements and US property descriptions still use it.

Sources: Wikipedia: Rod (unit); NIST SP 811, Appendix B.8 (length conversion factors)

Rod conversion chart

1 rod expressed in every other length unit:

More US & Imperial units

• inch (length)
• foot (length)
• yard (length)
• mile (length)
• thou (length)
• league (length)
• furlong (length)
• chain (length)
• link (length)
• hand (length)
• pound (weight & mass)
• ounce (weight & mass)
• grain (weight & mass)
• dram (weight & mass)
• cubic inch (volume)
• cubic foot (volume)

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