Convert Ell to US Survey Foot
Convert ells to us survey feet instantly. 1 ell = 3.7499925 us survey foot — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Survey Foot to Ell converter for the reverse conversion.
Units explained
Ell
An ell is an Imperial unit of length equal to 45 inches (1.143 m), historically used as the standard measure of cloth in English commerce.
The ell derives from old English elna (forearm) and was standardised in medieval English trade as the cloth-measuring yard equivalent. The English ell is 45 inches; other regional ells differed.
Ells appear in historical English commerce records (especially cloth and tapestry trade). Used in legal documents through the 19th century; rare in modern commerce but referenced in literary and historical contexts.
Medieval English cloth-trade origin; standardised at 45 inches; became exact via the 1959 International Yard and Pound Agreement.
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.
Ell to US Survey Foot 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 ells and us survey feet:
To convert ells to us survey feet, multiply the value in ells by 3.7499925. To reverse, multiply us survey feet by 0.2666672.
How to use this converter
Type a value into the calculator. The result in us survey feet updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Survey Foot to Ell converter for the reverse direction.
Step-by-step: convert ells to us survey feet
- Write down the value in ells (ell).
- Multiply that value by the factor 3.7499925.
- The product is the equivalent value in us survey feet (sft).
- To reverse, multiply the us survey foot value by 0.2666672.
Worked examples
Example 1 — Convert 1 ell to sft:
1 × 3.7499925 = 3.7499925 sft
Example 2 — Convert 100 ell to sft:
100 × 3.7499925 = 374.99925 sft
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 ell × 3.7499925 = 3.7499925 sft
Real-world example — Adult height conversion
A 1.8-ell-tall person measures a value in us survey feet 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 ell × 3.7499925 = 6.7499865 sft
Real-world example — Fabric purchase length
Two ells of fabric equals a value in us survey feet essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 ell × 3.7499925 = 7.499985 sft
Ell to US Survey Foot conversion table
Standard reference values for converting ells to us survey feet:
| Ell [ell] | US Survey Foot [sft] |
|---|---|
| 0.01 | 0.037499925 |
| 0.1 | 0.37499925 |
| 1 | 3.7499925 |
| 2 | 7.499985 |
| 3 | 11.2499775 |
| 4 | 14.99997 |
| 5 | 18.7499625 |
| 10 | 37.499925 |
| 20 | 74.99985 |
| 30 | 112.499775 |
| 40 | 149.9997 |
| 50 | 187.499625 |
| 100 | 374.99925 |
| 500 | 1874.99625 |
| 1000 | 3749.9925 |
Frequently asked questions
How many us survey feet is 1 ell?
How do I convert ells to us survey feet?
How do I convert us survey feet back to ells?
How many us survey feet is 100 ells?
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Sources & references
Conversion factor (1 ell = 3.7499925 sft) 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.