Fathoms to Kilometers
Convert fathoms to kilometers instantly. 1 ftm = 0.0018288 km. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert fathoms to kilometers
To convert fathoms to kilometers, divide by 546.8066491689 (multiply by 0.0018288). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
km = ftm × 0.0018288
Fathoms to Kilometers conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Fathoms | Kilometers |
|---|---|
| 1 ftm | 0.001829 km |
| 2 ftm | 0.003658 km |
| 3 ftm | 0.005486 km |
| 5 ftm | 0.009144 km |
| 10 ftm | 0.018288 km |
| 20 ftm | 0.036576 km |
| 25 ftm | 0.04572 km |
| 50 ftm | 0.09144 km |
| 100 ftm | 0.18288 km |
| 500 ftm | 0.9144 km |
| 1,000 ftm | 1.8288 km |
What is a fathom?
Six feet. The traditional unit for water depth on nautical charts.
What is a kilometer?
A thousand metres. The standard road-distance unit almost everywhere except the US and UK.
The formula
km = ftm × 0.0018288
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Fathoms to Kilometers
- Type the number of fathoms you want to convert.
- Read the result in kilometers straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked kilometers to fathoms page.
Fathoms to Kilometers — frequently asked questions
How many kilometers are in a fathom?
One fathom equals 0.0018288 km. km = ftm × 0.0018288
What is the formula to convert fathoms to kilometers?
The formula is km = ftm × 0.0018288. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert kilometers back to fathoms?
Divide instead of multiplying: one kilometer is 546.8066491689 ftm. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this fathoms to kilometers free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the fathoms to kilometers.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error