Convert Hand to Fathom
Convert hands to fathoms instantly. 1 hand = 0.0555555556 fathom — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Fathom to Hand converter for the reverse conversion.
Units explained
Hand
A hand is an Imperial unit of length equal to 4 inches (101.6 mm). It is used primarily to measure the height of horses at the withers.
The hand derives from the average breadth of a human hand and was standardised at exactly 4 inches by the Statute of Henry VIII in 1541.
Hands are used worldwide for horse height specification (the typical riding horse is 14–17 hh). Also used in some equestrian-adjacent contexts. The unit is now almost exclusively a horse-measurement convention.
Standardised at 4 inches by Henry VIII in 1541; value became exact in 1959 when the inch was fixed at 25.4 mm.
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.
Hand to Fathom conversion formula
The relationship between hands and fathoms:
To convert hands to fathoms, multiply the value in hands by 0.0555555556. To reverse, multiply fathoms by 18.
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 Hand converter for the reverse direction.
Step-by-step: convert hands to fathoms
- Write down the value in hands (hh).
- Multiply that value by the factor 0.0555555556.
- The product is the equivalent value in fathoms (ftm).
- To reverse, multiply the fathom value by 18.
Worked examples
Example 1 — Convert 1 hh to ftm:
1 × 0.0555555556 = 0.0555555556 ftm
Example 2 — Convert 100 hh to ftm:
100 × 0.0555555556 = 5.5555555556 ftm
Real-world example — Fabric purchase length
Two hands of fabric equals a value in fathoms essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 hh × 0.0555555556 = 0.1111111111 ftm
Real-world example — Maritime depth conversion
A 10-hand 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 hh × 0.0555555556 = 0.5555555556 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 hh × 0.0555555556 = 0.0555555556 ftm
Hand to Fathom conversion table
Standard reference values for converting hands to fathoms:
| Hand [hh] | Fathom [ftm] |
|---|---|
| 0.01 | 0.0005555556 |
| 0.1 | 0.0055555556 |
| 1 | 0.0555555556 |
| 2 | 0.1111111111 |
| 3 | 0.1666666667 |
| 4 | 0.2222222222 |
| 5 | 0.2777777778 |
| 10 | 0.5555555556 |
| 20 | 1.1111111111 |
| 30 | 1.6666666667 |
| 40 | 2.2222222222 |
| 50 | 2.7777777778 |
| 100 | 5.5555555556 |
| 500 | 27.7777777778 |
| 1000 | 55.5555555556 |
Frequently asked questions
How many fathoms is 1 hand?
How do I convert hands to fathoms?
How do I convert fathoms back to hands?
How many fathoms is 100 hands?
Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 hh = 0.0555555556 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.