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To convert a depth or length from fathoms to meters (m), multiply by 1.8288.
A fathom is exactly six feet, and the foot is defined as exactly 0.3048 m, so the factor 6 × 0.3048 = 1.8288 is exact. A serviceable mental shortcut: fathoms × 2, minus 10%.
An older nautical chart marks an anchorage at 15 fathoms, and the vessel's echo sounder reads meters:
The reverse divides: a 50 m depth contour sits at 27.34 fathoms.
| fathoms | m |
|---|---|
| 1 | 1.83 |
| 2 | 3.66 |
| 5 | 9.14 |
| 10 | 18.29 |
| 15 | 27.43 |
| 100 | 182.88 |
The fathom descends from the span of a sailor's outstretched arms — the length of sounding line hauled in per pull — and it remains the signature unit of marine depth. Modern official charts from most hydrographic offices are metric, but fathoms survive in three places that keep this conversion alive: older US and British charts still in circulation (US chart depths also appear in feet), fishing practice in English-speaking fleets, where net depths and ground descriptions are habitually given in fathoms, and literature — Mark Twain took his pen name from the leadsman's call for two fathoms of safe water. Chart work is where precision matters: a chart sounding in fathoms misread as meters understates depth by nearly half, which is at least conservative, but the reverse error — treating meters as fathoms — nearly doubles the apparent water under the keel. Checking the chart's title block for its depth unit before converting is standard bridge discipline, and the ×1.8288 factor handles the rest exactly.
How many fathoms are in one meter? One Meter (m) contains 0.54680664916885389326 Fathoms (fathom) — the inverse of the factor above. Multiplying by 1.8288 takes you from fathoms to meters; multiplying by 0.54680664916885389326 brings you back.
Put in words: one fathom equals 1.8288 meters, so the fathom is the larger unit of this pair. Converting between them never changes the amount of length being measured — only the size of the unit you count it in.
A fathom is a unit of length in the imperial system of measurement.
It is most famously used for measuring the depth of water.
A fathom is equal to exactly 6 feet (or 1.8288 meters). The plural form is fathoms.
The word "fathom" originates from the Old English word "fæthm," which means "outstretched arms" or "a pair of embracing arms."
Historically, a fathom was defined as the distance from the middle fingertip of one hand to the middle fingertip of the other when a person's arms are fully extended.
This made it a convenient and readily available unit of measurement for sailors and workers.
The fathom is best known for its use in a nautical context to measure water depth.
Mariners would drop a weighted line, called a sounding line, into the water and count the number of "arm spans" it took to reach the bottom.
This measurement was crucial for safe navigation, anchoring, and creating nautical charts to map the seabed.
While modern technology and the metric system have replaced the fathom in official hydrographic surveys, its influence persists.
The term is still used informally in commercial fishing and can be found on many older nautical charts.
Figuratively, the verb "to fathom"—meaning to understand something deeply—is a direct link to the original act of measuring depth and getting to the bottom of things.
The meter (m) is the foundational unit of length in the metric system, a standard of measurement used worldwide.
Simply put, it's used to measure the distance or separation between things.
The plural form is meters.
The original definition of the meter dates back to 1793.
The French Academy of Sciences established it as exactly one ten-millionth (1/10,000,000) of the distance from the North Pole to the Equator (measured along a line passing through Paris).
This ambitious goal was to create a universal unit based on a natural feature of the Earth itself.
Today, the modern definition is far more precise and is based on a universal constant: the speed of light.
Since 1983, the meter has been officially defined as the distance that light travels in a vacuum in exactly 1/299,792,458 of a second.
This modern definition ensures that the meter is incredibly stable and can be accurately reproduced in any lab around the world.
As one of the seven base units in the International System of Units (SI), the meter is essential for calculating many other derived units.
For example, the meter is used to measure:
The meter serves as a fundamental unit in scientific and engineering measurements worldwide.
Here are some quick reference conversions from Fathom (fathom) to Meter (m):
| Fathoms | Meters |
|---|---|
| 0.000001 fathom | 0.0000018288 m |
| 0.001 fathom | 0.0018288 m |
| 0.1 fathom | 0.18288 m |
| 1 fathom | 1.8288 m |
| 2 fathom | 3.6576 m |
| 3 fathom | 5.4864 m |
| 4 fathom | 7.3152 m |
| 5 fathom | 9.144 m |
| 6 fathom | 10.9728 m |
| 7 fathom | 12.8016 m |
| 8 fathom | 14.6304 m |
| 9 fathom | 16.4592 m |
| 10 fathom | 18.288 m |
| 20 fathom | 36.576 m |
| 30 fathom | 54.864 m |
| 40 fathom | 73.152 m |
| 50 fathom | 91.44 m |
| 100 fathom | 182.88 m |
| 1000 fathom | 1828.8 m |
| 10000 fathom | 18288 m |
Engineering datasheets across Europe write Fathom to Meter several different ways. The calculation is the same in every one of them.
| Language | Written as | Unit names |
|---|---|---|
| French | fathom en m | brasse → mètre |
| Spanish | fathom a m | braza → metro |
| Dutch | fathom naar m | vadem → meter |
| German | fathom in m | Faden → Meter |
| Polish | fathom na m | sążeń → metr |
For all Length converters, choose units using the From/To dropdowns above.