Marine & NauticalFeet to Fathoms

Feet to Fathoms

Snapshot

1 Foot equals 0.166667 Fathoms. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

Reference basis: This result uses fixed sounding-depth definitions for the active charting route.
Example: For 2 Feet, the result equals 0.333333 Fathoms.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

0.166667 Fathoms (ftm)

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Machine access

Available to apps and AI agents

Feet to Fathoms can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The identifiers below select the same calculation as the calculator.

Machine-readable identifiers

Conversion family: marine
Source unit: feet
Target unit: fathoms

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "marine",
  "value": 1,
  "from": "feet",
  "to": "fathoms"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "marine",
    "value": 1,
    "from": "feet",
    "to": "fathoms",
    "result": {
      "raw": 0.166666666667,
      "display": "0.166667"
    },
    "canonicalPath": "/marine/feet-to-fathoms/"
  }
}

Full API documentation

Explanation

Formula: Fathoms = Foot × 0.166667. Why: sounding and chart-depth units use fixed length definitions, so the calculator moves through one consistent depth basis before applying the target unit.

Feet (ft): an imperial length unit often used for sounding, draft, and depth reporting.

Fathoms (ftm): a marine length unit traditionally used for depth and sometimes short nautical distance references.

This route is useful when comparing sounding and draft-related values across meters, fathoms, feet, and yards in charting, surveying, and onboard operations.

This conversion is purely multiplicative because both units reduce through one fixed marine reference basis for the active family, with no offset.

Method & Marine Basis

Method basis: fixed sounding-depth definitions used for charting, draft checks, and onboard depth reporting.
Applied factor: 1 Foot = 0.166667 Fathoms.
Consistency rule: calculator output and common-value rows use the same fixed marine constants in both directions.

Common Conversion Values

Foot (ft)	Fathoms (ftm)
1	0.166667
2	0.333333
5	0.833333
10	1.666667
20	3.333333
50	8.333333
100	16.666667

Questions & answers

Frequently Asked Questions

How many fathoms are in 1 foot?

The fixed factor gives 1 foot = 0.166666666667 fathoms.

What is the reverse conversion for Feet to Fathoms?

Use the Fathoms to Feet page to reverse the same sounding-depth relationship for chart and draft work.

Can I use decimal feet values?

Yes. Decimal feet values are supported for sounding, draft, and chart-depth work.