Convert Square Rod to Rood
Convert square rods to roods instantly. 1 square rod = 0.025 rood — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Rood to Square Rod converter for the reverse conversion.
Units explained
Square Rod
A square rod is an imperial unit of area equal to approximately 25.293 m². It is part of the historical English land survey system.
Derived by squaring the rod (16.5 feet or 1/4 chain). The rod, perch, and pole are three names for the same length.
Square rods appear in historical English and American land surveys and legacy property records. The unit is largely obsolete today, surviving mainly in legal descriptions of older land grants.
Standardized via the 1959 International Yard and Pound Agreement.
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 Rod to Rood conversion formula
The relationship between square rods and roods:
To convert square rods to roods, multiply the value in square rods by 0.025. To reverse, multiply roods by 40.
How to use this converter
Type a value into the calculator. The result in roods updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Rood to Square Rod converter for the reverse direction.
Step-by-step: convert square rods to roods
- Write down the value in square rods (rd²).
- Multiply that value by the factor 0.025.
- The product is the equivalent value in roods (rood).
- To reverse, multiply the rood value by 40.
Worked examples
Example 1 — Convert 1 rd² to rood:
1 × 0.025 = 0.025 rood
Example 2 — Convert 100 rd² to rood:
100 × 0.025 = 2.5 rood
Square Rod to Rood conversion table
Standard reference values for converting square rods to roods:
| Square Rod [rd²] | Rood [rood] |
|---|---|
| 0.01 | 0.00025 |
| 0.1 | 0.0025 |
| 1 | 0.025 |
| 2 | 0.05 |
| 3 | 0.075 |
| 4 | 0.1 |
| 5 | 0.125 |
| 10 | 0.25 |
| 20 | 0.5 |
| 30 | 0.75 |
| 40 | 1 |
| 50 | 1.25 |
| 100 | 2.5 |
| 500 | 12.5 |
| 1000 | 25 |
Frequently asked questions
How many roods is 1 square rod?
How do I convert square rods to roods?
How do I convert roods back to square rods?
How many roods is 100 square rods?
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Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 rd² = 0.025 rood) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.