A rod measurement is a length of exactly 16.5 feet, which is 5.5 yards, 198 inches or 5.0292 meters. The rod is also called a pole or a perch. In addition, 4 rods make a surveyor’s chain (66 feet), 40 rods make a furlong, and 320 rods make one mile, according to NIST.
Convert a Rod Measurement to Meters, Yards and Inches
The converter below works in feet, so first type the length in feet. One rod is 16.5 feet, so the default value shows a single rod. For more rods, multiply by 16.5 first (for example, 10 rods = 165 feet). The tool then shows the same length in meters, yards, inches and miles.
You will mostly meet the rod in old property deeds, farm records, fence plans and canoe trail maps. Admittedly, it looks odd today because 16.5 is not a round number. However, it fits neatly into the old English chain, furlong and acre system, and that is why it survived for so long.
Fortunately, the value is fixed by definition. The National Institute of Standards and Technology (NIST) lists “16 1/2 feet = 1 rod (rd), pole, or perch” in its Handbook 44, Appendix C, the general tables of US units. Since the foot is exactly 0.3048 meters, a rod is exactly 5.0292 meters. So any converter that gives a different metric value is rounding or using an older survey definition.
Below, you will first find a quick chart. After that, the guide covers the rod’s history, how it links to chains and acres, the old survey rod, and how to measure one on the ground.
Rod Measurement Conversion Chart
First, use this chart for the conversions that come up most often. All values come from 1 rod = 16.5 ft and 1 ft = 0.3048 m, so they are exact.
| Rods | Feet | Yards | Meters | Also equals |
|---|---|---|---|---|
| 1 rod | 16.5 ft | 5.5 yd | 5.0292 m | 198 in |
| 2 rods | 33 ft | 11 yd | 10.0584 m | 1/2 chain |
| 3 rods | 49.5 ft | 16.5 yd | 15.0876 m | – |
| 4 rods | 66 ft | 22 yd | 20.1168 m | 1 chain |
| 5 rods | 82.5 ft | 27.5 yd | 25.146 m | – |
| 10 rods | 165 ft | 55 yd | 50.292 m | 2 1/2 chains |
| 20 rods | 330 ft | 110 yd | 100.584 m | 1/2 furlong |
| 40 rods | 660 ft | 220 yd | 201.168 m | 1 furlong |
| 80 rods | 1,320 ft | 440 yd | 402.336 m | 1/4 mile |
| 100 rods | 1,650 ft | 550 yd | 502.92 m | – |
| 160 rods | 2,640 ft | 880 yd | 804.672 m | 1/2 mile |
| 320 rods | 5,280 ft | 1,760 yd | 1,609.344 m | 1 mile |
Going the other way, 1 foot is about 0.0606 rod, and 100 meters is about 19.88 rods. Similarly, 1 kilometer is about 198.84 rods. Also, print this table or save it to your phone if you work with old deeds often.
Recommended Tools for Measuring Long Distances in Rods
Because nobody sells a tape marked in rods anymore, you measure in feet and convert. For example, a 25-foot tape is enough for a single rod. For fence lines and lot boundaries, however, a measuring wheel or a long open-reel tape is faster. Look for a wheel with a reset button and feet/tenths readout, and for a fiberglass tape that will not rust after a wet day in the field.
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Where the Rod Measurement Came From
To begin with, the rod is one of the oldest English land units. In medieval England, fields were laid out with wooden poles, and the length of those poles varied from place to place. Eventually, however, the royal standard settled on 5.5 yards, or 16.5 feet, and that is the rod we still use in conversion tables.
Next came the step that locked the rod in place. In 1620, the English mathematician Edmund Gunter designed a surveyor’s chain 66 feet long, divided into 100 links. Because 66 feet is exactly 4 rods, the chain fit the old system perfectly. As a result, surveyors could measure fields with a chain and still report them in rods, furlongs and acres.
In addition, the chain made area simple. One acre is 10 square chains, or a strip 1 chain wide and 1 furlong (40 rods) long. In other words, the acre is 160 square rods. Therefore, that neat link explains why the odd-looking 16.5-foot unit lasted for centuries in England and later in the United States.
How a Rod Fits With Chains, Furlongs and Miles
Overall, the rod works best when you see it as part of a family. Each unit is a whole number of rods, so converting between them is simple multiplication.
| Unit | In rods | In feet | In meters |
|---|---|---|---|
| Link | 4/25 rod (0.16) | 0.66 ft (7.92 in) | 0.201168 m |
| Rod (pole, perch) | 1 | 16.5 ft | 5.0292 m |
| Chain (Gunter’s) | 4 | 66 ft | 20.1168 m |
| Furlong | 40 | 660 ft | 201.168 m |
| Statute mile | 320 | 5,280 ft | 1,609.344 m |
For instance, a quarter-mile running track is 80 rods long. Likewise, a furlong in horse racing is 40 rods. If you want to see how the mile breaks down in yards instead, our guide to how many yards are in a mile walks through it.
Square Rod vs Linear Rod Measurement
A rod is a length, while a square rod is an area. Therefore, mixing the two up is the most common mistake in old deeds. In addition, the word “perch” can mean a length, an area or even a volume of stone, depending on who wrote it.
| People often confuse | What it really means | Value |
|---|---|---|
| Rod, pole or perch (length) | A distance | 16.5 ft = 5.0292 m |
| Square rod, square pole or square perch (area) | A patch of ground 1 rod by 1 rod | 272.25 sq ft = about 25.29 m² |
| Perch of stone (volume) | A mason’s volume unit | Often 24.75 cu ft, but local definitions vary |
| International rod | Based on the 0.3048 m foot | 5.0292 m exactly |
| US survey rod (legacy) | Based on the old US survey foot | about 5.029210 m |
| Leveling rod or grade rod | A surveying tool, not a unit | Usually marked in feet or meters |
So when a deed says “40 perches”, read the context. If it describes a boundary line, it is 660 feet. If it describes the size of a lot, however, it is 40 square rods, or 10,890 square feet (about 1,012 m²).
The Old Survey Rod and Why It Barely Matters
Until the end of 2022, the United States had two slightly different feet. For instance, the international foot is exactly 0.3048 m. However, the older US survey foot was 1200/3937 m, a hair longer. Because of this, a rod based on the survey foot is about 5.029210 m instead of 5.0292 m.
In practice, the gap is about 0.01 mm per rod, which is far too small to matter for a fence or a garden. Over a long survey baseline it can add up, though. NIST now says survey-foot definitions should be avoided except for historic and legacy uses, and its revised conversion factors table lists both values side by side. In short, use 5.0292 m unless you are matching an old official survey to the millimeter.
How to Measure a Rod on the Ground
- Set your starting point. First, drive a stake or mark a fence post where the distance begins.
- Hook a tape to the mark. Next, use a tape at least 25 feet long, or a long fiberglass reel for many rods.
- Pull out 16 feet 6 inches. That is one rod. On a metric tape, however, read 5.03 m instead.
- Keep the tape straight and taut. A sagging tape reads long, so pull it tight and keep it level.
- Repeat for longer distances. For many rods, multiply the rod count by 16.5 and measure that total in feet.
- Check with a measuring wheel. Finally, roll the wheel along the same line and compare; the two should agree within a few inches.
For a quick sanity check, an average adult walking pace is roughly 2.5 feet. As a result, one rod is about six or seven ordinary steps. Still, pacing is fine for a rough idea, but never for a boundary.
Where Rod Measurement Is Still Used Today
Today, the rod is no longer a legal unit for new work in most places. Even so, you still run into it in a few settings:
- Old land records. Also, many older US and UK deeds describe boundaries in rods, perches and chains.
- Canoe portages. For example, trail maps for northern Minnesota and Ontario canoe country often list portage lengths in rods.
- Farms and fencing. Similarly, older farmers sometimes quote fence lengths and wire rolls by the rod.
- Allotment gardens. In addition, British garden plots are traditionally sized in square rods or square poles.
Because of this, it helps to know the rod even if you never use it yourself. For other old distance units, see our explainer on what a league is, which also covers the history of long road distances.
Rod Measurement Do and Don’t
Do
- Use 16.5 feet or 5.0292 meters per rod.
- Check whether a deed means a length or an area.
- Convert to feet before you lay out a fence.
- Keep the tape level and tight on long runs.
- Hire a licensed surveyor for legal boundaries.
Don’t
- Round a rod to 5 meters for long distances.
- Assume “perch” always means a length.
- Trust pacing for anything that matters.
- Mix survey-foot and international values in one plan.
- Treat a leveling rod reading as rods of length.
Honest Limits of Old Rod Measurements
The modern rod is exact; historic ones, however, were not. Before the 16.5-foot standard, local rods could be longer or shorter, and some regions used customary rods of different sizes. Also, old surveys were made with iron chains that stretched with use, on rough ground, sometimes by eye. As a result, a boundary written as “40 rods” in an 1850 deed may not be exactly 660 feet on the ground today. In short, the conversion tells you what the number means, not where the original surveyor actually set the corner.
When Accuracy Really Matters
For a garden bed or a canoe trip, a rough rod is plenty. In other cases, however, small errors cost real money. For example, property lines, easements, building setbacks and land sales all depend on an exact boundary, and those are decided by the recorded survey and the monuments in the ground, not by a quick conversion.
Rod Measurement FAQs
What is a rod measurement?
A rod is an old English unit of length equal to 16.5 feet, 5.5 yards or 5.0292 meters. It is also called a pole or a perch.
How long is a rod in feet?
One rod is exactly 16.5 feet, which, in other words, is 16 feet 6 inches.
How many meters is a rod measurement?
One rod is exactly 5.0292 meters, because it is 16.5 feet and each foot is 0.3048 meters.
How many rods are in a mile?
There are 320 rods in a mile. Likewise, there are 40 rods in a furlong and 4 rods in a chain.
Is a rod the same as a pole or a perch?
Yes, as a length. Rod, pole and perch are three names for the same 16.5-foot unit. However, perch can also mean a square rod or a volume of stone.
How big is a square rod?
A square rod is 272.25 square feet, or about 25.29 square meters. Also, there are 160 square rods in an acre.
How many rods are in an acre?
An acre holds 160 square rods. A square acre is about 12.65 rods on each side, but acres do not have to be square.
Is rod measurement still used?
Rarely for new work. However, you still see it in old deeds, canoe portage maps, some farm fencing and British allotment plots.
Why is a rod 16.5 feet?
The rod was fixed at 5.5 yards in medieval England. Later, it fit the 66-foot surveyor’s chain (4 rods) and the acre (160 square rods), so the size stuck.
How do I convert rods to feet quickly?
Simply multiply the number of rods by 16.5 because each rod is 16.5 feet. For example, 10 rods times 16.5 equals 165 feet.
Rod Measurement: The Bottom Line
To sum up, a rod is exactly 16.5 feet, 5.5 yards or 5.0292 meters. Also, four rods make a chain, 40 make a furlong, and 320 make a mile, while 160 square rods make an acre.
Finally, remember that the rod is a length and the square rod is an area. Use the converter above for your own numbers, and for broader context on US customary units, read our guide to American units of measurement.
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