Convert Square Furlong to Square Chain
Convert square furlongs to square chains instantly. 1 square furlong = 100.0000000099 square chain — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Chain 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 Chain
A square chain is an imperial unit of area equal to approximately 404.686 m². It equals 1/10 of an acre.
Derived by squaring the chain (66 feet or 22 yards). The chain was defined by Edmund Gunter in 1620 specifically so that 10 square chains equal exactly one acre.
Square chains appear in US Public Land Survey System (PLSS) records and historical English property documents. The 10-to-1 ratio with acres made early survey arithmetic easier.
Defined by Edmund Gunter in 1620 specifically for surveying convenience.
Square Furlong to Square Chain conversion formula
The relationship between square furlongs and square chains:
To convert square furlongs to square chains, multiply the value in square furlongs by 100.0000000099. To reverse, multiply square chains by 0.01.
How to use this converter
Type a value into the calculator. The result in square chains 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 Chain to Square Furlong converter for the reverse direction.
Step-by-step: convert square furlongs to square chains
- Write down the value in square furlongs (fur²).
- Multiply that value by the factor 100.0000000099.
- The product is the equivalent value in square chains (ch²).
- To reverse, multiply the square chain value by 0.01.
Worked examples
Example 1 — Convert 1 fur² to ch²:
1 × 100.0000000099 = 100.0000000099 ch²
Example 2 — Convert 100 fur² to ch²:
100 × 100.0000000099 = 10000.0000009884 ch²
Real-world example — Coastal cruise distances
A 10-square furlong coastal sailing route converts to a different value in square chains — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 fur² × 100.0000000099 = 1000.0000000988 ch²
Real-world example — Road-sign distances across systems
A 100-square furlong road sign converts cleanly into square chains — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 fur² × 100.0000000099 = 10000.0000009884 ch²
Real-world example — Endurance race distances
A 50-square furlong cycling or running race converts to a recognizable distance in square chains. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 fur² × 100.0000000099 = 5000.0000004942 ch²
Square Furlong to Square Chain conversion table
Standard reference values for converting square furlongs to square chains:
| Square Furlong [fur²] | Square Chain [ch²] |
|---|---|
| 0.01 | 1.0000000001 |
| 0.1 | 10.000000001 |
| 1 | 100.0000000099 |
| 2 | 200.0000000198 |
| 3 | 300.0000000297 |
| 4 | 400.0000000395 |
| 5 | 500.0000000494 |
| 10 | 1000.0000000988 |
| 20 | 2000.0000001977 |
| 30 | 3000.0000002965 |
| 40 | 4000.0000003954 |
| 50 | 5000.0000004942 |
| 100 | 10000.0000009884 |
| 500 | 50000.0000049421 |
| 1000 | 100000.0000098842 |
Frequently asked questions
How many square chains is 1 square furlong?
How do I convert square furlongs to square chains?
How do I convert square chains back to square furlongs?
How many square chains is 100 square furlongs?
Popular area unit conversions
Convert Square Furlong to other area units
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Metric / SI (5 units)
Imperial / US Customary (14 units)
Sources & references
Conversion factor (1 fur² = 100.0000000099 ch²) 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.