Kilometers to Fathoms
Convert kilometers to fathoms instantly — one kilometer is 546.807 fathoms.
| Kilometers | Fathoms |
|---|---|
| 1 km | 546.806649 ftm |
| 2 km | 1093.613298 ftm |
| 3 km | 1640.419948 ftm |
| 5 km | 2734.033246 ftm |
| 10 km | 5468.066492 ftm |
| 25 km | 13670.166229 ftm |
| 50 km | 27340.332458 ftm |
| 100 km | 54680.664917 ftm |
How to use
- Enter a value in the Kilometers field.
- The Fathoms figure appears immediately — no button to press.
- Typing in the Fathoms field converts back to Kilometers the same way.
- Use the reference table for the values that come up most often.
Kilometers to Fathoms formula
The factor from kilometers to fathoms is 546.806649.
ftm = km × 546.806649
Why this factor: the kilometer and the fathom are both defined against the meter, so dividing one definition by the other gives 546.806649 directly. Both definitions are set out in full below.
To go the other way, divide by 546.806649 — or use the Fathoms to Kilometers converter, which is the same calculation reversed.
Worked example
Start with 5 km. Multiply by 546.806649 to get 2734.033246 ftm.
5 km × 546.806649 = 2734.033246 ftm
The converter above does this for any value you type, in either direction.
What is a kilometer?
A kilometer is 1,000 meters, the standard unit for road distances and geography in most of the world.
Definition: Exactly 1,000 meters by SI prefix definition — 'kilo' means 10³.
Where it is used: Road signs, running and cycling distances, and map scales outside the US and UK.
What is a fathom?
A fathom is six feet, the traditional unit for water depth.
Definition: Six international feet, so exactly 1.8288 meters.
Where it is used: Nautical charts, depth soundings, and anchor and cable lengths.
Kilometers vs Fathoms
The kilometer is a metric unit while the fathom is a specialized unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many fathoms are in a kilometer?
One kilometer equals 546.806649 fathoms.
What is the formula to convert kilometers to fathoms?
Multiply the number of kilometers by 546.806649. To reverse it, divide by 546.806649 instead.
How do I convert fathoms back to kilometers?
Divide by 546.806649, which is the same as multiplying by 0.0018288.
How many fathoms are in 10 kilometers?
10 km works out to 5468.066492 ftm.
How is the kilometer defined?
Exactly 1,000 meters by SI prefix definition — 'kilo' means 10³.