Kilometer is 1000 meter units.
Kilometers to Fathoms Converter — km to ftm
Convert Kilometer (km) to Fathom (ftm) using the exact conversion factor (1 kilometer = 546.8066492 fathom). See the formula, worked examples, conversion table, history, and common uses.
Kilometers to Fathoms 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.
A fathom is six feet.
Result = input x 1000 / 1.8288.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Kilometers to Fathoms
Kilometer and Fathom both measure length. Kilometer is most often used for road signage, speed limits, and vehicle odometers outside the us.
Formula
fathoms = kilometers × 546.806649169
This factor comes from each unit's defined relationship to the category's base unit: 1 kilometer equals 1000 base units, and 1 fathom equals 1.8288 base units, so dividing one by the other gives the direct kilometer-to-fathom factor of 546.806649169.
Simple example
1 km × 546.8066492 = 546.8066492 ftm
1 kilometer = 546.8066492 fathoms.
Real-world example
10 km × 546.8066492 = 5,468.066492 ftm
10 kilometers = 5,468.066492 fathoms.
Conversion table
| Kilometer (km) | Fathom (ftm) |
|---|---|
| 1 km | 546.8066492 ftm |
| 5 km | 2,734.033246 ftm |
| 10 km | 5,468.066492 ftm |
| 21.0975 km | 11,536.25328 ftm |
| 42.195 km | 23,072.50656 ftm |
| 100 km | 54,680.66492 ftm |
Reverse conversion: Fathom to Kilometer
546.8066492 ftm × 0.0018288 = 1 km
546.8066492 fathoms = 1 kilometers.
kilometers = fathoms × 0.0018288
For a page dedicated to this direction, see Fathom to Kilometer.
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.
Understanding the Fathom (ftm)
A fathom is six feet.
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 fathoms are in 1 kilometer?
1 kilometer equals 546.8066492 fathoms, using the exact defined conversion factor rather than an estimate.
How do I convert kilometer to fathom?
Multiply the kilometer value by 546.8066492. The converter above does this instantly to whatever precision you set.
How do I convert fathom back to kilometer?
Use the reverse factor: 1 fathom equals 0.0018288 kilometers. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a fathom?
Fathom (ftm) is a unit of length.
Is the kilometer to fathom conversion exact?
Yes. Both kilometer and fathom are defined by fixed standards rather than physical artifacts, so the factor of 546.8066492 used above is exact to as many digits as you choose to display.
Where is the kilometer still used today?
Standard road, distance, and mapping unit in nearly every country except the United States