Convert Acre to Square Furlong
Convert acres to square furlongs instantly. 1 acre = 0.1 square furlong — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Furlong to Acre converter for the reverse conversion.
Units explained
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
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 to Square Furlong conversion formula
The relationship between acres and square furlongs:
To convert acres to square furlongs, multiply the value in acres by 0.1. To reverse, multiply square furlongs by 10.
How to use this converter
Type a value into the calculator. The result in square furlongs 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 Furlong to Acre converter for the reverse direction.
Step-by-step: convert acres to square furlongs
- Write down the value in acres (ac).
- Multiply that value by the factor 0.1.
- The product is the equivalent value in square furlongs (fur²).
- To reverse, multiply the square furlong value by 10.
Worked examples
Example 1 — Convert 1 ac to fur²:
1 × 0.1 = 0.1 fur²
Example 2 — Convert 100 ac to fur²:
100 × 0.1 = 10 fur²
Real-world example — Endurance race distances
A 50-acre cycling or running race converts to a recognizable distance in square furlongs. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 ac × 0.1 = 5 fur²
Real-world example — Maritime exclusion zone
A 200-acre exclusion zone (a common maritime boundary) converts to a different value in square furlongs that's useful when describing the same zone in everyday land-distance units.
200 ac × 0.1 = 20 fur²
Real-world example — Coastal cruise distances
A 10-acre coastal sailing route converts to a different value in square furlongs — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 ac × 0.1 = 1 fur²
Acre to Square Furlong conversion table
Standard reference values for converting acres to square furlongs:
| Acre [ac] | Square Furlong [fur²] |
|---|---|
| 0.01 | 0.001 |
| 0.1 | 0.01 |
| 1 | 0.1 |
| 2 | 0.2 |
| 3 | 0.3 |
| 4 | 0.4 |
| 5 | 0.5 |
| 10 | 1 |
| 20 | 2 |
| 30 | 3 |
| 40 | 4 |
| 50 | 5 |
| 100 | 10 |
| 500 | 50 |
| 1000 | 100 |
Frequently asked questions
How many square furlongs is 1 acre?
How do I convert acres to square furlongs?
How do I convert square furlongs back to acres?
How many square furlongs is 100 acres?
Popular area unit conversions
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Metric / SI (16 units)
Imperial / US Customary (14 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Historical / Pre-metric European (6 units)
Sources & references
Conversion factor (1 ac = 0.1 fur²) 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.