An inch is exactly 0.0254 meters.
Inches to Fathoms Converter — in to ftm
Convert Inch (in) to Fathom (ftm) using the exact conversion factor (1 inch = 0.0138888889 fathom). See the formula, worked examples, conversion table, history, and common uses.
Inches to Fathoms 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.
A fathom is six feet.
Result = input x 0.0254 / 1.8288.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Inches to Fathoms
Inch and Fathom both measure length. Inch is most often used for screen and display size measurement worldwide (even in metric countries).
Formula
fathoms = inches × 0.0138888888889
This factor comes from each unit's defined relationship to the category's base unit: 1 inch equals 0.0254 base units, and 1 fathom equals 1.8288 base units, so dividing one by the other gives the direct inch-to-fathom factor of 0.0138888888889.
Simple example
1 in × 0.01388888889 = 0.0138888889 ftm
1 inch = 0.0138888889 fathoms.
Real-world example
10 in × 0.01388888889 = 0.1388888889 ftm
10 inches = 0.1388888889 fathoms.
Conversion table
| Inch (in) | Fathom (ftm) |
|---|---|
| 1 in | 0.0138888889 ftm |
| 5 in | 0.0694444444 ftm |
| 10 in | 0.1388888889 ftm |
| 21.0975 in | 0.2930208333 ftm |
| 42.195 in | 0.5860416667 ftm |
| 100 in | 1.388888889 ftm |
Reverse conversion: Fathom to Inch
0.0138888889 ftm × 72 = 1.000000001 in
0.0138888889 fathoms = 1.000000001 inches.
inches = fathoms × 72
For a page dedicated to this direction, see Fathom to Inch.
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.
Understanding the Fathom (ftm)
A fathom is six feet.
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 fathoms are in 1 inch?
1 inch equals 0.0138888889 fathoms, using the exact defined conversion factor rather than an estimate.
How do I convert inch to fathom?
Multiply the inch value by 0.01388888889. The converter above does this instantly to whatever precision you set.
How do I convert fathom back to inch?
Use the reverse factor: 1 fathom equals 72 inches. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a fathom?
Fathom (ftm) is a unit of length.
Is the inch to fathom 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.
Where is the inch still used today?
United States and United Kingdom (small measurements, screen sizes, hardware)