Convert Square Mile to Rood
Convert square miles to roods instantly. 1 square mile = 2560 rood — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Rood to Square Mile converter for the reverse conversion.
Units explained
Square Mile
A square mile is an imperial unit of area equal to exactly 2,589,988.110336 m². It is used for measuring large land areas in the United States and the United Kingdom.
Derived by squaring the statute mile (5,280 feet). The mile was standardized via the 1959 International Yard and Pound Agreement.
Square miles are used for US and UK regional geography (county areas, lake sizes, large parks), national statistics, and military range descriptions. 1 mi² = 640 acres = 2.589988 km².
Mile dates to Roman antiquity; modern exact value standardized in 1959.
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 Mile to Rood conversion formula
The relationship between square miles and roods:
To convert square miles to roods, multiply the value in square miles by 2560. To reverse, multiply roods by 0.000390625.
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 Mile converter for the reverse direction.
Step-by-step: convert square miles to roods
- Write down the value in square miles (mi²).
- Multiply that value by the factor 2560.
- The product is the equivalent value in roods (rood).
- To reverse, multiply the rood value by 0.000390625.
Worked examples
Example 1 — Convert 1 mi² to rood:
1 × 2560 = 2560 rood
Example 2 — Convert 100 mi² to rood:
100 × 2560 = 256000 rood
Square Mile to Rood conversion table
Standard reference values for converting square miles to roods:
| Square Mile [mi²] | Rood [rood] |
|---|---|
| 0.01 | 25.6 |
| 0.1 | 256 |
| 1 | 2560 |
| 2 | 5120 |
| 3 | 7680 |
| 4 | 10240 |
| 5 | 12800 |
| 10 | 25600 |
| 20 | 51200 |
| 30 | 76800 |
| 40 | 102400 |
| 50 | 128000 |
| 100 | 256000 |
| 500 | 1280000 |
| 1000 | 2560000 |
Frequently asked questions
How many roods is 1 square mile?
How do I convert square miles to roods?
How do I convert roods back to square miles?
How many roods is 100 square miles?
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Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 mi² = 2560 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.