A common cubit is approximated as 18 inches.
Cubits to Fathoms Converter — cubit to ftm
Convert Cubit (cubit) to Fathom (ftm) using the exact conversion factor (1 cubit = 0.25 fathom). See the formula, worked examples, and conversion table.
Cubits to Fathoms 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 fathom is six feet.
Result = input x 0.4572 / 1.8288.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubits to Fathoms
Cubit and Fathom both measure length. Specifically: A common cubit is approximated as 18 inches, and a fathom is six feet.
Formula
fathoms = cubits × 0.25
This factor comes from each unit's defined relationship to the category's base unit: 1 cubit equals 0.4572 base units, and 1 fathom equals 1.8288 base units, so dividing one by the other gives the direct cubit-to-fathom factor of 0.25.
Simple example
1 cubit × 0.25 = 0.25 ftm
1 cubit = 0.25 fathoms.
Real-world example
10 cubit × 0.25 = 2.5 ftm
10 cubits = 2.5 fathoms.
Conversion table
| Cubit (cubit) | Fathom (ftm) |
|---|---|
| 1 cubit | 0.25 ftm |
| 5 cubit | 1.25 ftm |
| 10 cubit | 2.5 ftm |
| 21.0975 cubit | 5.274375 ftm |
| 42.195 cubit | 10.54875 ftm |
| 100 cubit | 25 ftm |
Reverse conversion: Fathom to Cubit
0.25 ftm × 4 = 1 cubit
0.25 fathoms = 1 cubit.
cubits = fathoms × 4
For a page dedicated to this direction, see Fathom to Cubit.
Understanding the Cubit (cubit)
A common cubit is approximated as 18 inches.
Understanding the Fathom (ftm)
A fathom is six feet.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many fathoms are in 1 cubit?
1 cubit equals 0.25 fathoms, using the exact defined conversion factor rather than an estimate.
How do I convert cubit to fathom?
Multiply the cubit value by 0.25. The converter above does this instantly to whatever precision you set.
How do I convert fathom back to cubit?
Use the reverse factor: 1 fathom equals 4 cubits. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubit?
Cubit (cubit) is a unit of length.
What is a fathom?
Fathom (ftm) is a unit of length.
Is the cubit to fathom conversion exact?
Yes. Both cubit and fathom are defined by fixed standards rather than physical artifacts, so the factor of 0.25 used above is exact to as many digits as you choose to display.