Convert Perch to Furlong
Convert perches to furlongs instantly. 1 perch = 0.025 furlong — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Furlong to Perch converter for the reverse conversion.
Units explained
Perch
A perch is an Imperial unit of length identical to the rod — 16.5 feet (about 5.03 m). The names 'rod', 'perch', and 'pole' all refer to the same surveying unit and differ only by regional preference.
Like the rod, the perch derives from medieval English land-surveying. The name 'perch' was particularly common in legal land descriptions in Ireland and parts of the UK.
Perches appear in legacy land descriptions in Ireland, the UK, and historical US documents. Modern usage is rare.
Medieval English surveying origin; identical to the rod since 1620; became exact via the 1959 International Yard and Pound Agreement.
Furlong
A furlong is an Imperial unit of length equal to 660 feet, or exactly one eighth of a mile (about 201.17 m). It is the longest unit in the traditional English farm-and-survey system.
The furlong derives from Old English furh (furrow) + lang (long) — originally the length of a furrow in a typical medieval English open field. Standardised at 660 feet (= 10 chains = 220 yards = 1/8 mile) in medieval times.
Furlongs are the standard distance unit in horse racing (e.g., 'The race is 8 furlongs'), historical English farming and surveying, and occasional poetic or rhetorical usage. Modern racing courses worldwide list distances in furlongs.
Medieval English farming origin; standardised at 660 feet; remains the official distance unit in flat-racing thoroughbred horse races worldwide.
Perch to Furlong conversion formula
The relationship between perches and furlongs:
To convert perches to furlongs, multiply the value in perches by 0.025. To reverse, multiply furlongs by 40.
How to use this converter
Type a value into the calculator. The result in 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 Furlong to Perch converter for the reverse direction.
Step-by-step: convert perches to furlongs
- Write down the value in perches (perch).
- Multiply that value by the factor 0.025.
- The product is the equivalent value in furlongs (fur).
- To reverse, multiply the furlong value by 40.
Worked examples
Example 1 — Convert 1 perch to fur:
1 × 0.025 = 0.025 fur
Example 2 — Convert 100 perch to fur:
100 × 0.025 = 2.5 fur
Real-world example — Maritime depth conversion
A 10-perch sounding depth converts cleanly into furlongs. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 perch × 0.025 = 0.25 fur
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 perch × 0.025 = 0.025 fur
Real-world example — Adult height conversion
A 1.8-perch-tall person measures a value in furlongs that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 perch × 0.025 = 0.045 fur
Perch to Furlong conversion table
Standard reference values for converting perches to furlongs:
| Perch [perch] | Furlong [fur] |
|---|---|
| 0.01 | 0.00025 |
| 0.1 | 0.0025 |
| 1 | 0.025 |
| 2 | 0.05 |
| 3 | 0.075 |
| 4 | 0.1 |
| 5 | 0.125 |
| 10 | 0.25 |
| 20 | 0.5 |
| 30 | 0.75 |
| 40 | 1 |
| 50 | 1.25 |
| 100 | 2.5 |
| 500 | 12.5 |
| 1000 | 25 |
Frequently asked questions
How many furlongs is 1 perch?
How do I convert perches to furlongs?
How do I convert furlongs back to perches?
How many furlongs is 100 perches?
Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 perch = 0.025 fur) 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.