Feet to Fathom Converter
Length · unit-converter
Convert Feet to Fathom with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use SI-based definitions (international yard, nautical mile, etc.).
Calculator
From: Feet (ft)
To: Fathom (fathom)
About Feet
Feet are imperial and US customary units of length; each is exactly 0.3048 meters. Twelve inches make one feet; feet are common in construction and human-scale dimensions.
About Fathom
The fathom is an imperial/nautical depth unit equal to 6 feet (1.8288 meters). It is common in marine contexts and charted water depths.
How to convert feet to fathoms
1 feet is equal to 0.16666666666667 fathom:
1 ft = (0.3048 m ÷ 1.8288 m) fathom = 0.16666666666667 fathom
Each feet is defined as 0.3048 m and each fathom as 1.8288 m, so one ft equals 0.3048 ÷ 1.8288 fathom = 0.16666666666667 fathom.
Let d(ft) be the numeric value of the same length measured in Feet (ft), and d(fathom) the value in Fathom (fathom). Then:
d(fathom) = d(ft) × (0.3048 / 1.8288)
Equivalently, divide by how many ft fit into one fathom (meters per fathom divided by meters per ft):
d(fathom) = d(ft) ÷ 6
Or: fathom = feet ÷ 6
Examples
Example #1: Convert 20 ft to fathom
20 ft = 20 ft × (0.3048/1.8288) fathom = 3.3333333333 fathom
20 ft = 20 ft ÷ 6 = 3.3333333333 fathom
Example #2: Convert 50 ft to fathom
50 ft = 50 ft × (0.3048/1.8288) fathom = 8.3333333333 fathom
50 ft = 50 ft ÷ 6 = 8.3333333333 fathom
Summary
To convert Feet to Fathom, multiply the value in ft by the ratio of meters per ft divided by meters per fathom. Equivalently: value_fathom = value_ft × (0.3048 / 1.8288). Numerically, 1 ft equals 0.16666666666666669 fathom.
Relationship context
Both units belong to US customary / imperial length. Conversions often use simple ratios (for example inches and feet), while miles relate to yards and feet through fixed definitions. The numeric factor used here is traceable to the international inch (0.0254 m) and related definitions.
Conversion tables
| Feet (ft) | Fathom (fathom) |
|---|---|
| 0.1 | 0.0166666667 |
| 1 | 0.1666666667 |
| 2 | 0.3333333333 |
| 3 | 0.5 |
| 4 | 0.6666666667 |
| 5 | 0.8333333333 |
| 6 | 1 |
| 7 | 1.1666666667 |
| 8 | 1.3333333333 |
| 9 | 1.5 |
| Feet (ft) | Fathom (fathom) |
|---|---|
| 10 | 1.6666666667 |
| 20 | 3.3333333333 |
| 30 | 5 |
| 40 | 6.6666666667 |
| 50 | 8.3333333333 |
| 60 | 10 |
| 70 | 11.6666666667 |
| 80 | 13.3333333333 |
| 90 | 15 |
| 100 | 16.6666666667 |