US Survey Feet to Fathoms
Convert us survey feet to fathoms instantly. 1 ft-us = 0.166667 ftm. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert us survey feet to fathoms
To convert us survey feet to fathoms, divide by 5.999988 (multiply by 0.166667). 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-us × 0.166667
US Survey Feet to Fathoms conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| US Survey Feet | Fathoms |
|---|---|
| 1 ft-us | 0.166667 ftm |
| 2 ft-us | 0.333334 ftm |
| 3 ft-us | 0.500001 ftm |
| 5 ft-us | 0.833335 ftm |
| 10 ft-us | 1.66667 ftm |
| 20 ft-us | 3.33334 ftm |
| 25 ft-us | 4.166675 ftm |
| 50 ft-us | 8.33335 ftm |
| 100 ft-us | 16.6667 ftm |
| 500 ft-us | 83.3335 ftm |
| 1,000 ft-us | 166.667 ftm |
What is a us survey feet?
The pre-2023 US surveying foot, longer than the international foot by 2 ppm.
What is a fathom?
Six feet. The traditional unit for water depth on nautical charts.
The formula
ftm = ft-us × 0.166667
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 US Survey Feet to Fathoms
- Type the number of us survey 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 us survey feet page.
US Survey Feet to Fathoms — frequently asked questions
How many fathoms are in a us survey feet?
One us survey feet equals 0.166667 ftm. ftm = ft-us × 0.166667
What is the formula to convert us survey feet to fathoms?
The formula is ftm = ft-us × 0.166667. 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 us survey feet?
Divide instead of multiplying: one fathom is 5.999988 ft-us. 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 us survey 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.
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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