A fathom is six feet.
Fathoms to US survey feet Converter — ftm to ftUS
Convert Fathom (ftm) to US survey foot (ftUS) using the exact conversion factor (1 fathom = 5.999988 us survey foot). See the formula, worked examples, and conversion table.
Fathoms to US survey feet converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
The US survey foot is 1200/3937 meters and is retained for legacy land records.
Result = input x 1.8288 / 0.3048006096.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fathoms to US survey feet
Fathom and US survey foot both measure length. Specifically: A fathom is six feet, and the US survey foot is 1200/3937 meters and is retained for legacy land records.
Formula
us survey feet = fathoms × 5.999988
This factor comes from each unit's defined relationship to the category's base unit: 1 fathom equals 1.8288 base units, and 1 us survey foot equals 0.304800609601 base units, so dividing one by the other gives the direct fathom-to-us survey foot factor of 5.999988.
Simple example
1 ftm × 5.999988 = 5.999988 ftUS
1 fathom = 5.999988 us survey feet.
Real-world example
10 ftm × 5.999988 = 59.99988 ftUS
10 fathoms = 59.99988 us survey feet.
Conversion table
| Fathom (ftm) | US survey foot (ftUS) |
|---|---|
| 1 ftm | 5.999988 ftUS |
| 5 ftm | 29.99994 ftUS |
| 10 ftm | 59.99988 ftUS |
| 21.0975 ftm | 126.5847468 ftUS |
| 42.195 ftm | 253.1694937 ftUS |
| 100 ftm | 599.9988 ftUS |
Reverse conversion: US survey foot to Fathom
5.999988 ftUS × 0.166667 = 1 ftm
5.999988 us survey feet = 1 fathom.
fathoms = us survey feet × 0.166667000001
For a page dedicated to this direction, see US survey foot to Fathom.
Understanding the Fathom (ftm)
A fathom is six feet.
Understanding the US survey foot (ftUS)
The US survey foot is 1200/3937 meters and is retained for legacy land records.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many us survey feet are in 1 fathom?
1 fathom equals 5.999988 us survey feet, using the exact defined conversion factor rather than an estimate.
How do I convert fathom to us survey foot?
Multiply the fathom value by 5.999988. The converter above does this instantly to whatever precision you set.
How do I convert us survey foot back to fathom?
Use the reverse factor: 1 us survey foot equals 0.166667 fathoms. You can also use the swap control in the converter above to flip the direction instantly.
What is a fathom?
Fathom (ftm) is a unit of length.
What is a us survey foot?
US survey foot (ftUS) is a unit of length.
Is the fathom to us survey foot conversion exact?
Yes. Both fathom and us survey foot are defined by fixed standards rather than physical artifacts, so the factor of 5.999988 used above is exact to as many digits as you choose to display.