Convert Ell to Fathom
Convert ells to fathoms instantly. 1 ell = 0.625 fathom — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Fathom 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.
Fathom
A fathom is an Imperial unit of length equal to 6 feet or exactly 1.8288 meters. It is used almost exclusively for measuring water depth in maritime contexts.
The fathom derives from the Old English word fæthm, meaning "the embracing arms" — the distance between the fingertips of a person's outstretched arms. Standardized at 6 feet in English maritime tradition.
Fathoms are used in nautical depth charts, scuba diving, oceanography, and maritime literature. Despite metrication efforts, fathoms remain common in English-language nautical charts and recreational diving.
Old English origin (predating 1066); standardized at 6 feet by English maritime tradition; fixed at 1.8288 m exactly via the 1959 International Yard and Pound Agreement.
Ell to Fathom conversion formula
The relationship between ells and fathoms:
To convert ells to fathoms, multiply the value in ells by 0.625. To reverse, multiply fathoms by 1.6.
How to use this converter
Type a value into the calculator. The result in fathoms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Fathom to Ell converter for the reverse direction.
Step-by-step: convert ells to fathoms
- Write down the value in ells (ell).
- Multiply that value by the factor 0.625.
- The product is the equivalent value in fathoms (ftm).
- To reverse, multiply the fathom value by 1.6.
Worked examples
Example 1 — Convert 1 ell to ftm:
1 × 0.625 = 0.625 ftm
Example 2 — Convert 100 ell to ftm:
100 × 0.625 = 62.5 ftm
Real-world example — Fabric purchase length
Two ells of fabric equals a value in fathoms essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 ell × 0.625 = 1.25 ftm
Real-world example — Maritime depth conversion
A 10-ell sounding depth converts cleanly into fathoms. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 ell × 0.625 = 6.25 ftm
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 × 0.625 = 0.625 ftm
Ell to Fathom conversion table
Standard reference values for converting ells to fathoms:
| Ell [ell] | Fathom [ftm] |
|---|---|
| 0.01 | 0.00625 |
| 0.1 | 0.0625 |
| 1 | 0.625 |
| 2 | 1.25 |
| 3 | 1.875 |
| 4 | 2.5 |
| 5 | 3.125 |
| 10 | 6.25 |
| 20 | 12.5 |
| 30 | 18.75 |
| 40 | 25 |
| 50 | 31.25 |
| 100 | 62.5 |
| 500 | 312.5 |
| 1000 | 625 |
Frequently asked questions
How many fathoms is 1 ell?
How do I convert ells to fathoms?
How do I convert fathoms back to ells?
How many fathoms is 100 ells?
Popular length unit conversions
Convert Ell to other length units
Show all Ell conversions
Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 ell = 0.625 ftm) 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.