Convert Square Furlong to Square Mile
Convert square furlongs to square miles instantly. 1 square furlong = 0.015625 square mile — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Mile to Square Furlong converter for the reverse conversion.
Units explained
Square Furlong
A square furlong is an imperial unit of area equal to exactly 40,468.564 m², or 10 acres.
Derived by squaring the furlong (660 feet or 1/8 mile). The furlong itself comes from medieval English 'furrow long', the length of a plowed furrow.
Square furlongs are rarely used today. The unit appears occasionally in historical English farming records and in some horseracing contexts (though usually as length, not area).
Medieval English origin; standardized via the 1959 International Yard and Pound Agreement.
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.
Square Furlong to Square Mile conversion formula
The relationship between square furlongs and square miles:
To convert square furlongs to square miles, multiply the value in square furlongs by 0.015625. To reverse, multiply square miles by 64.
How to use this converter
Type a value into the calculator. The result in square miles 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 Mile to Square Furlong converter for the reverse direction.
Step-by-step: convert square furlongs to square miles
- Write down the value in square furlongs (fur²).
- Multiply that value by the factor 0.015625.
- The product is the equivalent value in square miles (mi²).
- To reverse, multiply the square mile value by 64.
Worked examples
Example 1 — Convert 1 fur² to mi²:
1 × 0.015625 = 0.015625 mi²
Example 2 — Convert 100 fur² to mi²:
100 × 0.015625 = 1.5625 mi²
Real-world example — Maritime exclusion zone
A 200-square furlong exclusion zone (a common maritime boundary) converts to a different value in square miles that's useful when describing the same zone in everyday land-distance units.
200 fur² × 0.015625 = 3.125 mi²
Real-world example — Coastal cruise distances
A 10-square furlong coastal sailing route converts to a different value in square miles — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 fur² × 0.015625 = 0.15625 mi²
Real-world example — Road-sign distances across systems
A 100-square furlong road sign converts cleanly into square miles — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 fur² × 0.015625 = 1.5625 mi²
Square Furlong to Square Mile conversion table
Standard reference values for converting square furlongs to square miles:
| Square Furlong [fur²] | Square Mile [mi²] |
|---|---|
| 0.01 | 0.00015625 |
| 0.1 | 0.0015625 |
| 1 | 0.015625 |
| 2 | 0.03125 |
| 3 | 0.046875 |
| 4 | 0.0625 |
| 5 | 0.078125 |
| 10 | 0.15625 |
| 20 | 0.3125 |
| 30 | 0.46875 |
| 40 | 0.625 |
| 50 | 0.78125 |
| 100 | 1.5625 |
| 500 | 7.8125 |
| 1000 | 15.625 |
Frequently asked questions
How many square miles is 1 square furlong?
How do I convert square furlongs to square miles?
How do I convert square miles back to square furlongs?
How many square miles is 100 square furlongs?
Popular area unit conversions
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Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 fur² = 0.015625 mi²) 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.