A fathom is six feet.
Fathoms to Cubits Converter — ftm to cubit
Convert Fathom (ftm) to Cubit (cubit) using the exact conversion factor (1 fathom = 4 cubit). See the formula, worked examples, and conversion table.
Fathoms to Cubits 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.
A common cubit is approximated as 18 inches.
Result = input x 1.8288 / 0.4572.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fathoms to Cubits
Fathom and Cubit both measure length. Specifically: A fathom is six feet, and a common cubit is approximated as 18 inches.
Formula
cubits = fathoms × 4
This factor comes from each unit's defined relationship to the category's base unit: 1 fathom equals 1.8288 base units, and 1 cubit equals 0.4572 base units, so dividing one by the other gives the direct fathom-to-cubit factor of 4.
Simple example
1 ftm × 4 = 4 cubit
1 fathom = 4 cubits.
Real-world example
10 ftm × 4 = 40 cubit
10 fathoms = 40 cubits.
Conversion table
| Fathom (ftm) | Cubit (cubit) |
|---|---|
| 1 ftm | 4 cubit |
| 5 ftm | 20 cubit |
| 10 ftm | 40 cubit |
| 21.0975 ftm | 84.39 cubit |
| 42.195 ftm | 168.78 cubit |
| 100 ftm | 400 cubit |
Reverse conversion: Cubit to Fathom
4 cubit × 0.25 = 1 ftm
4 cubits = 1 fathom.
fathoms = cubits × 0.25
For a page dedicated to this direction, see Cubit to Fathom.
Understanding the Fathom (ftm)
A fathom is six feet.
Understanding the Cubit (cubit)
A common cubit is approximated as 18 inches.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubits are in 1 fathom?
1 fathom equals 4 cubits, using the exact defined conversion factor rather than an estimate.
How do I convert fathom to cubit?
Multiply the fathom value by 4. The converter above does this instantly to whatever precision you set.
How do I convert cubit back to fathom?
Use the reverse factor: 1 cubit equals 0.25 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 cubit?
Cubit (cubit) is a unit of length.
Is the fathom to cubit conversion exact?
Yes. Both fathom and cubit are defined by fixed standards rather than physical artifacts, so the factor of 4 used above is exact to as many digits as you choose to display.