Nanometers to Fathoms
An instant nanometers-to-fathoms converter, with the formula and a reference table below.
| Nanometers | Fathoms |
|---|---|
| 1 nm | 5.46807e-10 ftm |
| 2 nm | 1.09361e-09 ftm |
| 3 nm | 1.64042e-09 ftm |
| 5 nm | 2.73403e-09 ftm |
| 10 nm | 5.46807e-09 ftm |
| 25 nm | 1.36702e-08 ftm |
| 50 nm | 2.73403e-08 ftm |
| 100 nm | 5.46807e-08 ftm |
How to use
- Enter a value in the Nanometers field.
- The Fathoms figure appears immediately — no button to press.
- Typing in the Fathoms field converts back to Nanometers the same way.
- Use the reference table for the values that come up most often.
Nanometers to Fathoms formula
Converting nanometers to fathoms is a single multiplication by 5.46806649e-10.
ftm = nm × 5.46806649e-10
Why this factor: the nanometer and the fathom are both defined against the meter, so dividing one definition by the other gives 5.46806649e-10 directly. Both definitions are set out in full below.
To go the other way, divide by 5.46806649e-10 — or use the Fathoms to Nanometers converter, which is the same calculation reversed.
Worked example
Given 12 nm, multiplying by 5.46806649e-10 yields 6.56168e-09 ftm.
12 nm × 5.46806649e-10 = 6.56168e-09 ftm
The converter above does this for any value you type, in either direction.
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).
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.
Nanometers vs Fathoms
The nanometer is a metric unit while the fathom is a specialized 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 fathoms are in a nanometer?
One nanometer equals 5.46806649e-10 fathoms.
What is the formula to convert nanometers to fathoms?
Multiply the number of nanometers by 5.46806649e-10. To reverse it, divide by 5.46806649e-10 instead.
How do I convert fathoms back to nanometers?
Divide by 5.46806649e-10, which is the same as multiplying by 1.8288e+09.
How many fathoms are in 10 nanometers?
10 nm works out to 5.46807e-09 ftm.
How is the nanometer defined?
Exactly 1×10⁻⁹ meter by SI prefix definition.