Fathoms to US Survey Feet
Convert fathoms to us survey feet instantly. 1 ftm = 5.999988 ft-us. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert fathoms to us survey feet
To convert fathoms to us survey feet, multiply by 5.999988. 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.
ft-us = ftm × 5.999988
Fathoms to US Survey Feet conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Fathoms | US Survey Feet |
|---|---|
| 1 ftm | 5.999988 ft-us |
| 2 ftm | 11.999976 ft-us |
| 3 ftm | 17.999964 ft-us |
| 5 ftm | 29.99994 ft-us |
| 10 ftm | 59.99988 ft-us |
| 20 ftm | 119.99976 ft-us |
| 25 ftm | 149.9997 ft-us |
| 50 ftm | 299.9994 ft-us |
| 100 ftm | 599.9988 ft-us |
| 500 ftm | 2,999.99 ft-us |
| 1,000 ftm | 5,999.99 ft-us |
What is a fathom?
Six feet. The traditional unit for water depth on nautical charts.
What is a us survey feet?
The pre-2023 US surveying foot, longer than the international foot by 2 ppm.
The formula
ft-us = ftm × 5.999988
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 US Survey Feet
- Type the number of fathoms you want to convert.
- Read the result in us survey feet 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 us survey feet to fathoms page.
Fathoms to US Survey Feet — frequently asked questions
How many us survey feet are in a fathom?
One fathom equals 5.999988 ft-us. ft-us = ftm × 5.999988
What is the formula to convert fathoms to us survey feet?
The formula is ft-us = ftm × 5.999988. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert us survey feet back to fathoms?
Divide instead of multiplying: one us survey feet is 0.166667 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 us survey feet 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 us survey feet.
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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