18 ft = 3 fm. To convert feet to fathoms, divide by 6: 18 ÷ 6 = 3.
How to convert feet to fathoms
fm = ft × 0.16666667
- 1 ft = 0.16666667 fm (and 1 fm = 6 ft).
- Multiply the amount by the factor: 18 × 0.16666667 = 3.
- Answer: 18 ft = 3 fm.
Shortcut: dividing by 6 gives the same result as multiplying by 0.16666667.
Feet to Fathoms table
| Feet (ft) | Fathoms (fm) |
|---|---|
| 13 ft | 2.1667 fm |
| 14 ft | 2.3333 fm |
| 15 ft | 2.5 fm |
| 16 ft | 2.6667 fm |
| 17 ft | 2.8333 fm |
| 18 ft | 3 fm |
| 19 ft | 3.1667 fm |
| 20 ft | 3.3333 fm |
| 21 ft | 3.5 fm |
| 22 ft | 3.6667 fm |
| 23 ft | 3.8333 fm |
| ft | fm |
|---|---|
| 1 ft | 0.166667 fm |
| 5 ft | 0.833333 fm |
| 10 ft | 1.6667 fm |
| 50 ft | 8.3333 fm |
| 100 ft | 16.6667 fm |
| 1,000 ft | 166.667 fm |
Good to know
1 inch = 2.54 cm exactly; 1 cm = 10 mm; 1 m = 100 cm; 1 foot = 12 inches = 30.48 cm.