Convert Square Furlong to Acre
Convert square furlongs to acres instantly. 1 square furlong = 10 acre — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Acre 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.
Acre
An acre is an imperial unit of area equal to exactly 4046.8564224 m². It is the most widely used non-metric unit for land area, particularly in the US, UK, and India.
Originally defined in medieval England as the area one yoke of oxen could plow in a day, approximately 40 perches by 4 perches. Standardized via the 1959 International Yard and Pound Agreement.
Acres are the standard land measurement unit in the US (real estate, agriculture), the UK (rural property), and widely used in India (alongside hectares and traditional regional units). 1 acre = 4840 sq yd = 43,560 sq ft = 0.4047 hectare.
Medieval English farming origin; modern exact value standardized in 1959.
Square Furlong to Acre conversion formula
The relationship between square furlongs and acres:
To convert square furlongs to acres, multiply the value in square furlongs by 10. To reverse, multiply acres by 0.1.
How to use this converter
Type a value into the calculator. The result in acres updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Acre to Square Furlong converter for the reverse direction.
Step-by-step: convert square furlongs to acres
- Write down the value in square furlongs (fur²).
- Multiply that value by the factor 10.
- The product is the equivalent value in acres (ac).
- To reverse, multiply the acre value by 0.1.
Worked examples
Example 1 — Convert 1 fur² to ac:
1 × 10 = 10 ac
Example 2 — Convert 100 fur² to ac:
100 × 10 = 1000 ac
Real-world example — Maritime exclusion zone
A 200-square furlong exclusion zone (a common maritime boundary) converts to a different value in acres that's useful when describing the same zone in everyday land-distance units.
200 fur² × 10 = 2000 ac
Real-world example — Coastal cruise distances
A 10-square furlong coastal sailing route converts to a different value in acres — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 fur² × 10 = 100 ac
Real-world example — Road-sign distances across systems
A 100-square furlong road sign converts cleanly into acres — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 fur² × 10 = 1000 ac
Square Furlong to Acre conversion table
Standard reference values for converting square furlongs to acres:
| Square Furlong [fur²] | Acre [ac] |
|---|---|
| 0.01 | 0.1 |
| 0.1 | 1 |
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 10 | 100 |
| 20 | 200 |
| 30 | 300 |
| 40 | 400 |
| 50 | 500 |
| 100 | 1000 |
| 500 | 5000 |
| 1000 | 10000 |
Frequently asked questions
How many acres is 1 square furlong?
How do I convert square furlongs to acres?
How do I convert acres back to square furlongs?
How many acres 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 = 10 ac) 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.