A fathom is six feet.
Fathoms to Kilometers Converter — ftm to km
Convert Fathom (ftm) to Kilometer (km) using the exact conversion factor (1 fathom = 0.0018288 kilometer). See the formula, worked examples, conversion table, history, and common uses.
Fathoms to Kilometers converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
Kilometer is 1000 meter units.
Result = input x 1.8288 / 1000.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fathoms to Kilometers
Fathom and Kilometer both measure length. Specifically: A fathom is six feet, and kilometer is 1000 meter units.
Formula
kilometers = fathoms × 0.0018288
This factor comes from each unit's defined relationship to the category's base unit: 1 fathom equals 1.8288 base units, and 1 kilometer equals 1000 base units, so dividing one by the other gives the direct fathom-to-kilometer factor of 0.0018288.
Simple example
1 ftm × 0.0018288 = 0.0018288 km
1 fathom = 0.0018288 kilometers.
Real-world example
10 ftm × 0.0018288 = 0.018288 km
10 fathoms = 0.018288 kilometers.
Conversion table
| Fathom (ftm) | Kilometer (km) |
|---|---|
| 1 ftm | 0.0018288 km |
| 5 ftm | 0.009144 km |
| 10 ftm | 0.018288 km |
| 21.0975 ftm | 0.038583108 km |
| 42.195 ftm | 0.077166216 km |
| 100 ftm | 0.18288 km |
Reverse conversion: Kilometer to Fathom
0.0018288 km × 546.8066492 = 1 ftm
0.0018288 kilometers = 1 fathom.
fathoms = kilometers × 546.806649169
For a page dedicated to this direction, see Kilometer to Fathom.
Understanding the Fathom (ftm)
A fathom is six feet.
Understanding the Kilometer
Kilometer (km) measures distance. A kilometer is 1,000 meters — the meter is the SI base unit of length. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard road, distance, and mapping unit in nearly every country except the United States
Uses of the Kilometer today
- Road signage, speed limits, and vehicle odometers outside the US
- Geographic and mapping distances
- Endurance sports (marathons are measured in kilometers internationally, though the marathon distance itself is a fixed value in both systems)
History of the Kilometer
The meter was defined during the French Revolutionary metric reforms as one ten-millionth of the distance from the North Pole to the Equator along a meridian through Paris. 'Kilo-' is simply the SI prefix for 1,000, making the kilometer a direct decimal multiple.
The meter itself has been redefined several times as measurement precision improved — from a physical platinum-iridium bar (1889) to a krypton-86 wavelength (1960) to its current definition (1983) as the distance light travels in a fixed fraction of a second.
Historical origin. Kilometer was not the invention of a single named person; it developed through the process described above.
Kilometer — sources
- BIPM — The metre (SI base unit) — Current definition and history of the meter.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilometers are in 1 fathom?
1 fathom equals 0.0018288 kilometers, using the exact defined conversion factor rather than an estimate.
How do I convert fathom to kilometer?
Multiply the fathom value by 0.0018288. The converter above does this instantly to whatever precision you set.
How do I convert kilometer back to fathom?
Use the reverse factor: 1 kilometer equals 546.8066492 fathoms. You can also use the swap control in the converter above to flip the direction instantly.
What is a fathom?
Fathom (ftm) is a unit of length.
What is a kilometer?
Kilometer (km) measures distance. A kilometer is 1,000 meters — the meter is the SI base unit of length. It is classified as a SI derived (metric prefix) unit.
Is the fathom to kilometer conversion exact?
Yes. Both fathom and kilometer are defined by fixed standards rather than physical artifacts, so the factor of 0.0018288 used above is exact to as many digits as you choose to display.