Convert US Survey Foot to Perch
Convert us survey feet to perches instantly. 1 us survey foot = 0.0606061818 perch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Perch to US Survey Foot converter for the reverse conversion.
Units explained
US Survey Foot
The US Survey Foot is a legacy unit of length defined as exactly 1200/3937 meters (approximately 0.3048006 m). It differs from the modern international foot by about 2 parts per million.
Established in the United States by the Mendenhall Order of 1893, which defined the foot in terms of the meter as 1200/3937 m. The US continued using this value for surveying even after the 1959 International Yard and Pound Agreement standardized the international foot at exactly 0.3048 m.
Used in US land surveying, geodetic measurements, state plane coordinate systems, and legal land descriptions. The US Survey Foot was officially deprecated by NIST and NOAA effective December 31, 2022, with the international foot becoming the sole US standard. Legacy data and recorded land surveys still reference it.
Mendenhall Order of 1893 defined the foot as 1200/3937 m; persisted in US surveying after 1959; officially deprecated by NIST/NOAA as of December 31, 2022.
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.
US Survey Foot to Perch conversion formula
Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.
The relationship between us survey feet and perches:
To convert us survey feet to perches, multiply the value in us survey feet by 0.0606061818. To reverse, multiply perches by 16.499967.
How to use this converter
Type a value into the calculator. The result in 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 Perch to US Survey Foot converter for the reverse direction.
Step-by-step: convert us survey feet to perches
- Write down the value in us survey feet (sft).
- Multiply that value by the factor 0.0606061818.
- The product is the equivalent value in perches (perch).
- To reverse, multiply the perch value by 16.499967.
Worked examples
Example 1 — Convert 1 sft to perch:
1 × 0.0606061818 = 0.0606061818 perch
Example 2 — Convert 100 sft to perch:
100 × 0.0606061818 = 6.0606181818 perch
Real-world example — Fabric purchase length
Two us survey feet of fabric equals a value in perches essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 sft × 0.0606061818 = 0.1212123636 perch
Real-world example — Maritime depth conversion
A 10-us survey foot sounding depth converts cleanly into perches. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 sft × 0.0606061818 = 0.6060618182 perch
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 sft × 0.0606061818 = 0.0606061818 perch
US Survey Foot to Perch conversion table
Standard reference values for converting us survey feet to perches:
| US Survey Foot [sft] | Perch [perch] |
|---|---|
| 0.01 | 0.0006060618 |
| 0.1 | 0.0060606182 |
| 1 | 0.0606061818 |
| 2 | 0.1212123636 |
| 3 | 0.1818185455 |
| 4 | 0.2424247273 |
| 5 | 0.3030309091 |
| 10 | 0.6060618182 |
| 20 | 1.2121236364 |
| 30 | 1.8181854546 |
| 40 | 2.4242472727 |
| 50 | 3.0303090909 |
| 100 | 6.0606181818 |
| 500 | 30.3030909092 |
| 1000 | 60.6061818184 |
Frequently asked questions
How many perches is 1 us survey foot?
How do I convert us survey feet to perches?
How do I convert perches back to us survey feet?
How many perches is 100 us survey feet?
Popular length unit conversions
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Metric / SI (7 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Sources & references
Conversion factor (1 sft = 0.0606061818 perch) 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.