Convert Rood to Square Pole
Convert roods to square poles instantly. 1 rood = 40 square pole — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Pole to Rood converter for the reverse conversion.
Units explained
Rood
A rood is an imperial unit of area equal to approximately 1011.71 m², or 1/4 of an acre. It was historically used in England and parts of the British Empire.
Defined as one-quarter of an acre; historically used in medieval English farming as the area one ox could plow in a day. The word relates to 'rod' as a measure of length used in plot dimensions.
Roods appear in historical English farming records, parish records, and old property deeds. The unit is functionally obsolete today.
Medieval English farming origin; standardized via the 1959 International Yard and Pound Agreement.
Square Pole
A square pole is identical to a square rod, equal to approximately 25.293 m². 'Pole' is a regional name used in some US and British contexts.
Identical to square rod and square perch; differs only in regional naming preference.
Square poles appear in some historical US land records, particularly in mid-Atlantic states with strong English colonial heritage.
Standardized via the 1959 International Yard and Pound Agreement.
Rood to Square Pole conversion formula
The relationship between roods and square poles:
To convert roods to square poles, multiply the value in roods by 40. To reverse, multiply square poles by 0.025.
How to use this converter
Type a value into the calculator. The result in square poles updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Pole to Rood converter for the reverse direction.
Step-by-step: convert roods to square poles
- Write down the value in roods (rood).
- Multiply that value by the factor 40.
- The product is the equivalent value in square poles (pole²).
- To reverse, multiply the square pole value by 0.025.
Worked examples
Example 1 — Convert 1 rood to pole²:
1 × 40 = 40 pole²
Example 2 — Convert 100 rood to pole²:
100 × 40 = 4000 pole²
Real-world example — Endurance race distances
A 50-rood cycling or running race converts to a recognizable distance in square poles. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 rood × 40 = 2000 pole²
Real-world example — Maritime exclusion zone
A 200-rood exclusion zone (a common maritime boundary) converts to a different value in square poles that's useful when describing the same zone in everyday land-distance units.
200 rood × 40 = 8000 pole²
Real-world example — Coastal cruise distances
A 10-rood coastal sailing route converts to a different value in square poles — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 rood × 40 = 400 pole²
Rood to Square Pole conversion table
Standard reference values for converting roods to square poles:
| Rood [rood] | Square Pole [pole²] |
|---|---|
| 0.01 | 0.4 |
| 0.1 | 4 |
| 1 | 40 |
| 2 | 80 |
| 3 | 120 |
| 4 | 160 |
| 5 | 200 |
| 10 | 400 |
| 20 | 800 |
| 30 | 1200 |
| 40 | 1600 |
| 50 | 2000 |
| 100 | 4000 |
| 500 | 20000 |
| 1000 | 40000 |
Frequently asked questions
How many square poles is 1 rood?
How do I convert roods to square poles?
How do I convert square poles back to roods?
How many square poles is 100 roods?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 rood = 40 pole²) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.