Convert Fathom to Meter (ftm → m)
The fathom is the traditional marine depth unit, equal to six feet, used in nautical charts and diving manuals.
Fathom to Meter Conversion Table
10 common values| Fathom | Meter |
|---|---|
| 1 ftm | 1.8288 m |
| 5 ftm | 9.144 m |
| 10 ftm | 18.288 m |
| 25 ftm | 45.72 m |
| 50 ftm | 91.44 m |
| 100 ftm | 182.88 m |
| 250 ftm | 457.2 m |
| 500 ftm | 914.4 m |
| 1,000 ftm | 1,828.8 m |
| 5,000 ftm | 9,144 m |
How to Convert Fathom to Meter Manually
Step by StepConverting fathoms to meters is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in fathomsStart with the number of fathoms (ftm) you want to convert.
- 2Multiply by 1.8288The conversion factor from ftm to m is 1.8288. Multiply your value by this number.
- 3Read the result in metersThe result is your value in meters (m).
Formula
Multiply the value in fathoms by 1.8288. For the reverse direction, multiply by 0.546807.
m = ftm × 1.8288ftm = m × 0.546807Tips
Use these in everyday conversions- 1 fathom = 2 yards = 6 feet = 1.8288 m.
- Modern charts use metres internationally; fathoms are mostly historical.
- The word "fathom" comes from Old English for "outstretched arms" — originally the span of an adult's arms.
Common Mistakes
Avoid these- Reading a modern chart that uses metres as if it were fathoms — a factor-of-1.83 depth error.
- Confusing fathoms with feet on mixed-unit charts.
- Assuming all US charts still use fathoms — NOAA has largely migrated to metres.
About Fathom and Meter
What is the Fathom?
The fathom equals exactly 1.8288 meters or 6 feet and is the traditional marine depth unit. The word derives from the Old English 'fæðm,' meaning the span of outstretched arms — historically the distance a sailor could measure rope by stretching it from fingertip to fingertip. Used since antiquity for sounding water depth (lowering a weighted line and counting fathom marks), the fathom remains common in nautical charts, diving manuals, and marine literature. Famous from Mark Twain's pen name (a riverboat lead's call meaning 'safe water,' 2 fathoms or 12 feet) and Shakespeare's 'full fathom five,' the unit retains cultural resonance. Modern oceanographic science prefers the meter, but the fathom persists in fishing, recreational diving, and historical maritime contexts. The fathom relates to the foot (1 fathom = 6 ft) and the yard (1 fathom = 2 yd).
- Water depth on older US nautical charts
- Maritime literature and historical navigation
- Sport diving and scuba depth references in the US
A "mark twain" reading — made famous by the Mississippi riverboats — meant 2 fathoms (3.66 m) of water, the minimum safe depth.
What is the Meter?
The meter is the base SI unit of length. Originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole through Paris, it has been redefined several times for greater precision. Since 1983, the meter has been defined by the speed of light: the distance light travels in vacuum during 1/299,792,458 of a second. This definition links the meter to a fundamental physical constant, making it reproducible anywhere in the universe. The meter is the parent unit for all metric lengths — kilometers, centimeters, millimeters — and is used globally in science, engineering, construction, and sports. A standard door is about 2 meters tall, and the average adult walking pace covers roughly 1 meter per step.
- Room dimensions and building measurements in Europe
- Track-and-field events (100 m, 200 m, 400 m sprint)
- Scientific papers and engineering drawings worldwide
A standard door is about 2 metres tall. An Olympic swimming pool is exactly 50 metres long. The Eiffel Tower is 330 metres tall.