Convert Square Furlong to Square Perch
Convert square furlongs to square perches instantly. 1 square furlong = 1600 square perch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Perch 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 Perch
A square perch is identical to a square rod, equal to approximately 25.293 m². 'Perch' is the older English regional name for the same unit.
Identical in value to square rod and square pole; differs only in regional naming preference. 'Perch' is more commonly used in British and Irish historical contexts.
Square perches survive in some historical British property records, particularly in Ireland where the unit had legal status until the metric transition.
Standardized via the 1959 International Yard and Pound Agreement.
Square Furlong to Square Perch conversion formula
The relationship between square furlongs and square perches:
To convert square furlongs to square perches, multiply the value in square furlongs by 1600. To reverse, multiply square perches by 0.000625.
How to use this converter
Type a value into the calculator. The result in square perches 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 Perch to Square Furlong converter for the reverse direction.
Step-by-step: convert square furlongs to square perches
- Write down the value in square furlongs (fur²).
- Multiply that value by the factor 1600.
- The product is the equivalent value in square perches (perch²).
- To reverse, multiply the square perch value by 0.000625.
Worked examples
Example 1 — Convert 1 fur² to perch²:
1 × 1600 = 1600 perch²
Example 2 — Convert 100 fur² to perch²:
100 × 1600 = 160000 perch²
Real-world example — Endurance race distances
A 50-square furlong cycling or running race converts to a recognizable distance in square perches. Endurance athletes coming from a different measurement system use this conversion to compare training plans across regions.
50 fur² × 1600 = 80000 perch²
Real-world example — Maritime exclusion zone
A 200-square furlong exclusion zone (a common maritime boundary) converts to a different value in square perches that's useful when describing the same zone in everyday land-distance units.
200 fur² × 1600 = 320000 perch²
Real-world example — Coastal cruise distances
A 10-square furlong coastal sailing route converts to a different value in square perches — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 fur² × 1600 = 16000 perch²
Square Furlong to Square Perch conversion table
Standard reference values for converting square furlongs to square perches:
| Square Furlong [fur²] | Square Perch [perch²] |
|---|---|
| 0.01 | 16 |
| 0.1 | 160 |
| 1 | 1600 |
| 2 | 3200 |
| 3 | 4800 |
| 4 | 6400 |
| 5 | 8000 |
| 10 | 16000 |
| 20 | 32000 |
| 30 | 48000 |
| 40 | 64000 |
| 50 | 80000 |
| 100 | 160000 |
| 500 | 800000 |
| 1000 | 1600000 |
Frequently asked questions
How many square perches is 1 square furlong?
How do I convert square furlongs to square perches?
How do I convert square perches back to square furlongs?
How many square perches 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 = 1600 perch²) 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.