Fathoms to Nanometers
Type a value in either box to convert between fathoms and nanometers. The factor is 1.8288e+09.
| Fathoms | Nanometers |
|---|---|
| 1 ftm | 1828800000 nm |
| 2 ftm | 3657600000 nm |
| 3 ftm | 5486399999.999999 nm |
| 5 ftm | 9143999999.999998 nm |
| 10 ftm | 18287999999.999996 nm |
| 25 ftm | 45719999999.999992 nm |
| 50 ftm | 91439999999.999985 nm |
| 100 ftm | 182879999999.999969 nm |
How to use
- Enter a value in the Fathoms field.
- The Nanometers figure appears immediately — no button to press.
- Typing in the Nanometers field converts back to Fathoms the same way.
- Use the reference table for the values that come up most often.
Fathoms to Nanometers formula
Converting fathoms to nanometers is a single multiplication by 1.8288e+09.
nm = ftm × 1.8288e+09
Why this factor: the fathom and the nanometer are both defined against the meter, so dividing one definition by the other gives 1.8288e+09 directly. Both definitions are set out in full below.
To go the other way, divide by 1.8288e+09 — or use the Nanometers to Fathoms converter, which is the same calculation reversed.
Worked example
Take 100 ftm and multiply by the factor 1.8288e+09: the result is 182879999999.999969 nm.
100 ftm × 1.8288e+09 = 182879999999.999969 nm
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 nanometer?
A nanometer is one billionth of a meter — the scale of molecules and visible light wavelengths.
Definition: Exactly 1×10⁻⁹ meter by SI prefix definition.
Where it is used: Semiconductor process nodes, optical coatings, and wavelengths (visible light is roughly 380–750 nm).
Fathoms vs Nanometers
The fathom is a specialized unit while the nanometer 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 nanometers are in a fathom?
One fathom equals 1.8288e+09 nanometers.
What is the formula to convert fathoms to nanometers?
Multiply the number of fathoms by 1.8288e+09. To reverse it, divide by 1.8288e+09 instead.
How do I convert nanometers back to fathoms?
Divide by 1.8288e+09, which is the same as multiplying by 5.46806649e-10.
How many nanometers are in 10 fathoms?
10 ftm works out to 18287999999.999996 nm.
How is the fathom defined?
Six international feet, so exactly 1.8288 meters.