Fathoms to Decimeters
Type a value in either box to convert between fathoms and decimeters. The factor is 18.288.
| Fathoms | Decimeters |
|---|---|
| 1 ftm | 18.288 dm |
| 2 ftm | 36.576 dm |
| 3 ftm | 54.864 dm |
| 5 ftm | 91.44 dm |
| 10 ftm | 182.88 dm |
| 25 ftm | 457.2 dm |
| 50 ftm | 914.4 dm |
| 100 ftm | 1828.8 dm |
How to use
- Enter a value in the Fathoms field.
- The Decimeters figure appears immediately — no button to press.
- Typing in the Decimeters field converts back to Fathoms the same way.
- Use the reference table for the values that come up most often.
Fathoms to Decimeters formula
The factor from fathoms to decimeters is 18.288.
dm = ftm × 18.288
Why this factor: the fathom and the decimeter are both defined against the meter, so dividing one definition by the other gives 18.288 directly. Both definitions are set out in full below.
To go the other way, divide by 18.288 — or use the Decimeters to Fathoms converter, which is the same calculation reversed.
Worked example
Start with 5 ftm. Multiply by 18.288 to get 91.44 dm.
5 ftm × 18.288 = 91.44 dm
The converter above does this for any value you type, in either direction.
What is a fathom?
A fathom is six feet, the traditional unit for water depth.
Definition: Six international feet, so exactly 1.8288 meters.
Where it is used: Nautical charts, depth soundings, and anchor and cable lengths.
What is a decimeter?
A decimeter is one tenth of a meter — 10 centimeters.
Definition: Exactly 0.1 meter by SI prefix definition.
Where it is used: Rare in everyday speech, but it matters because a cubic decimeter is exactly one liter.
Worth knowing: The decimeter's real importance is volumetric: 1 dm³ = 1 L exactly, which is where the liter comes from.
Fathoms vs Decimeters
The fathom is a specialized unit while the decimeter is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many decimeters are in a fathom?
One fathom equals 18.288 decimeters.
What is the formula to convert fathoms to decimeters?
Multiply the number of fathoms by 18.288. To reverse it, divide by 18.288 instead.
How do I convert decimeters back to fathoms?
Divide by 18.288, which is the same as multiplying by 0.0546806649.
How many decimeters are in 10 fathoms?
10 ftm works out to 182.88 dm.
Is there anything to watch out for with decimeters?
The decimeter's real importance is volumetric: 1 dm³ = 1 L exactly, which is where the liter comes from.
How is the fathom defined?
Six international feet, so exactly 1.8288 meters.