OceanCalc

Fathom Converter — Kilometers

Convert between fathoms, feet, and meters. Fathoms are commonly used for water depth and anchor chain.

Last updated: March 28, 2026

Author: OceanCalc Editorial Team · Publisher: Albor Digital LLC

Page focus

Use this view when you need kilometer-focused results from the Fathom Converter. Enter your values above; results stay synchronized with the full tool.

Fathom Converter

Result

Feet

60

Meters

18.29

Formula

1 fathom = 6 feet = 1.8288 m

Overview

Use the Fathom Converter for fast, reliable maritime math—built on standard nautical relationships with straightforward inputs.

How to use

Start by filling in the fields for the Fathom Converter; the page recalculates as you type so you can iterate through options in one place.

Formula

The relationship behind this tool is: 1 fathom = 6 feet = 1.8288 m

1 fathom = 6 feet = 1.8288 meters. Historically the span of a sailor's arms; still used for depth and cable length.

Charts often show depth in fathoms. Anchor chain is sometimes marked in fathoms (1 shackle = 15 fathoms).

Practical use cases

Typical uses for the Fathom Converter include passage planning, briefing crew, converting instrument readouts to chart units, and double-checking mental math when fatigue or weather make errors more likely.

Tips for accuracy

  • Confirm that the units you enter match your chart, GPS, or instrument readout before relying on the Fathom Converter.
  • In rough weather or poor visibility, cross-check important results with a second method or a crew member.
  • Treat simplified models (wave height, radar horizon, etc.) as estimates—real conditions vary with fetch, refraction, and equipment.

Practical examples

  • 10 fathoms = 60 ft = 18.29 m
  • 1 fathom = 6 ft

Frequently Asked Questions

  • What is a fathom?

    A fathom is 6 feet (1.8288 m), originally the span of a person's outstretched arms. It is used for water depth and in some regions for anchor chain.

  • Why use fathoms?

    Marine charts in some areas show depth in fathoms. Lead lines were marked in fathoms. It remains a standard unit in maritime use.

  • How accurate is this calculator?

    This calculator uses standard maritime formulas and practical approximations where noted. It is suitable for planning and cross-checks; always verify safety-critical decisions with official references and local conditions.

  • Can I use this on mobile?

    Yes. OceanCalc tools are responsive and work on phones and tablets for quick checks on deck or in the cockpit.

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Results are estimates for educational purposes only and should not be used for real navigation decisions.

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