Feet to Fathoms
Convert feet to fathoms instantly. 1 ft = 0.1666666667 ftm. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert feet to fathoms
To convert feet to fathoms, divide by 6 (multiply by 0.1666666667). 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.
ftm = ft × 0.1666666667
Feet to Fathoms conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Feet | Fathoms |
|---|---|
| 1 ft | 0.166667 ftm |
| 2 ft | 0.333333 ftm |
| 3 ft | 0.5 ftm |
| 5 ft | 0.833333 ftm |
| 10 ft | 1.666667 ftm |
| 20 ft | 3.333333 ftm |
| 25 ft | 4.166667 ftm |
| 50 ft | 8.333333 ftm |
| 100 ft | 16.666667 ftm |
| 500 ft | 83.333333 ftm |
| 1,000 ft | 166.666667 ftm |
What is a feet?
Twelve inches, exactly 0.3048 m. Still standard for aviation altitude worldwide.
What is a fathom?
Six feet. The traditional unit for water depth on nautical charts.
The formula
ftm = ft × 0.1666666667
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 Feet to Fathoms
- Type the number of feet you want to convert.
- Read the result in fathoms 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 fathoms to feet page.
Feet to Fathoms — frequently asked questions
How many fathoms are in a feet?
One feet equals 0.1666666667 ftm. ftm = ft × 0.1666666667
What is the formula to convert feet to fathoms?
The formula is ftm = ft × 0.1666666667. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert fathoms back to feet?
Divide instead of multiplying: one fathom is 6 ft. 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 feet to fathoms 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 feet to fathoms.
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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