A fathom is six feet.
Fathoms to Inches Converter — ftm to in
Convert Fathom (ftm) to Inch (in) using the exact conversion factor (1 fathom = 72 inch). See the formula, worked examples, conversion table, history, and common uses.
Fathoms to Inches converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
An inch is exactly 0.0254 meters.
Result = input x 1.8288 / 0.0254.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fathoms to Inches
Fathom and Inch both measure length. Specifically: A fathom is six feet, and an inch is exactly 0.0254 meters.
Formula
inches = fathoms × 72
This factor comes from each unit's defined relationship to the category's base unit: 1 fathom equals 1.8288 base units, and 1 inch equals 0.0254 base units, so dividing one by the other gives the direct fathom-to-inch factor of 72.
Simple example
1 ftm × 72 = 72 in
1 fathom = 72 inches.
Real-world example
10 ftm × 72 = 720 in
10 fathoms = 720 inches.
Conversion table
| Fathom (ftm) | Inch (in) |
|---|---|
| 1 ftm | 72 in |
| 5 ftm | 360 in |
| 10 ftm | 720 in |
| 21.0975 ftm | 1,519.02 in |
| 42.195 ftm | 3,038.04 in |
| 100 ftm | 7,200 in |
Reverse conversion: Inch to Fathom
72 in × 0.01388888889 = 1 ftm
72 inches = 1 fathom.
fathoms = inches × 0.0138888888889
For a page dedicated to this direction, see Inch to Fathom.
Understanding the Fathom (ftm)
A fathom is six feet.
Understanding the Inch
Inch (in) measures distance. The international inch is defined as exactly 25.4 millimeters. It is classified as a US/imperial customary unit.
Where it's used: United States and United Kingdom (small measurements, screen sizes, hardware)
Uses of the Inch today
- Screen and display size measurement worldwide (even in metric countries)
- US/UK small-object and body measurement
- Hardware, tools, and pipe fittings (US)
History of the Inch
The inch traces to medieval England, traditionally defined as the length of three barleycorns, later standardized as 1/12 of a foot. The international inch (exactly 25.4 mm) was fixed by the same 1959 agreement that standardized the foot and yard.
Historical origin. Inch was not the invention of a single named person; it developed through the process described above.
Inch — sources
- NIST — International yard and pound (1959) — Fixes the modern inch at exactly 25.4 millimeters.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many inches are in 1 fathom?
1 fathom equals 72 inches, using the exact defined conversion factor rather than an estimate.
How do I convert fathom to inch?
Multiply the fathom value by 72. The converter above does this instantly to whatever precision you set.
How do I convert inch back to fathom?
Use the reverse factor: 1 inch equals 0.0138888889 fathoms. You can also use the swap control in the converter above to flip the direction instantly.
What is a fathom?
Fathom (ftm) is a unit of length.
What is a inch?
Inch (in) measures distance. The international inch is defined as exactly 25.4 millimeters. It is classified as a US/imperial customary unit.
Is the fathom to inch conversion exact?
Yes. The international inch is defined as exactly 25.4 millimeters. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.