Convert length and distance units — meters, feet, inches, kilometers, miles, light years and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 in | 1.38889e-05 ftm | |
| 0.01 in | 0.000138889 ftm | |
| 0.1 in | 0.00138889 ftm | |
| 1 in | 0.0138889 ftm | |
| 5 in | 0.0694444 ftm | |
| 10 in | 0.138889 ftm | |
| 50 in | 0.694444 ftm | |
| 100 in | 1.38889 ftm | |
| 1000 in | 13.8889 ftm |
Multiply the number of Inchs by 0.0138889 to get Fathoms. Formula: ftm = in × 0.0138889. Example: 10 in × 0.0138889 = 0.138889 ftm. To reverse, divide Fathoms by 0.0138889 to get Inchs.
| Inch (in) | Fathom (ftm) |
|---|---|
| 0.001 in | 1.38889e-05 ftm |
| 0.01 in | 0.000138889 ftm |
| 0.1 in | 0.00138889 ftm |
| 0.5 in | 0.00694444 ftm |
| 1 in | 0.0138889 ftm |
| 2 in | 0.0277778 ftm |
| 5 in | 0.0694444 ftm |
| 10 in | 0.138889 ftm |
| 20 in | 0.277778 ftm |
| 50 in | 0.694444 ftm |
| 100 in | 1.38889 ftm |
| 250 in | 3.47222 ftm |
| 500 in | 6.94444 ftm |
| 1000 in | 13.8889 ftm |
| 10000 in | 138.889 ftm |
To convert Inch to Fathom, multiply by 0.0138889. Example: 10 in = 0.138889 ftm
To convert Fathom back to Inch, divide by 0.0138889 (multiply by 72). Use the swap button above.
Start with 100 Inchs = 1.38889 ftm as your reference point. Scale up or down from there.
Ship draught is measured in fathoms while hull plate thickness, pipe diameters, and fitting dimensions are in inches. Shipbuilders convert between fathoms and inches in every vessel construction specification.
Rope diameter is specified in inches while anchor rode length uses fathoms by maritime tradition. Marine equipment buyers convert between fathoms and inches when specifying and ordering complete anchoring systems.
US and British naval logs from the 18th–20th centuries record vessel dimensions in inches and water depths in fathoms. Naval historians convert between the two units when cross-referencing operational records.
Dive equipment dimensions — cylinder valves, BCD buckles, weight belt hardware — use inches while dive site depth guides use fathoms. Dive equipment retailers convert between fathoms and inches for product listings.
Submarine cable diameters are specified in inches while installation depths use fathoms. Cable engineers convert between the two in every installation specification and marine survey report.
Navigation students learning to use historic charts encounter fathoms for depth data while equipment specifications use inches. Converting between the two is a core competency in US and UK maritime training programmes.
The Inch is a unit of Length measurement (symbol: in). 1 in = 0.0138889 ftm. Used in scientific and practical Length measurement applications.
The Fathom is a unit of Length measurement (symbol: ftm). It is part of an internationally recognised measurement system used alongside the Inch.
The inch has one of the most colourful origin stories in measurement history. An English statute from 1324 under King Edward II defined it as 'three grains of barley, dry and round, placed end to end'. Before that, it was often defined as the width of a thumb — hence the word in many languages (French: 'pouce', Dutch: 'duim', both meaning thumb). The inch was standardised at exactly 25.4 mm in 1959 under the International Yard and Pound Agreement signed by the US, UK, Canada, Australia, and South Africa. It remains dominant in the US and is universally used for screen sizes globally.
The fathom derives from the Old English 'fæthm', meaning the span of outstretched arms — roughly 6 feet or 1.8 metres. It was the primary depth measurement unit used by mariners for millennia, recorded in the Bible and used by ancient Greeks. The word 'fathom' also entered English as a verb meaning to understand something deeply — from the idea of plumbing the depths. Despite metrication, fathoms remain on admiralty charts and in nautical tradition worldwide.
Common use: Inch to Fathom conversion is needed when working with international standards, scientific publications, or reference materials that use different unit systems for Length measurement.