Convert Fathom to Nanometer
Convert fathoms to nanometers instantly. 1 fathom = 1.8288e+9 nanometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Nanometer to Fathom converter for the reverse conversion.
Units explained
Fathom
A fathom is an Imperial unit of length equal to 6 feet or exactly 1.8288 meters. It is used almost exclusively for measuring water depth in maritime contexts.
The fathom derives from the Old English word fæthm, meaning "the embracing arms" — the distance between the fingertips of a person's outstretched arms. Standardized at 6 feet in English maritime tradition.
Fathoms are used in nautical depth charts, scuba diving, oceanography, and maritime literature. Despite metrication efforts, fathoms remain common in English-language nautical charts and recreational diving.
Old English origin (predating 1066); standardized at 6 feet by English maritime tradition; fixed at 1.8288 m exactly via the 1959 International Yard and Pound Agreement.
Nanometer
A nanometer is a metric unit of length equal to one billionth of a meter (1×10⁻⁹ m). It is the standard unit for measuring atomic and molecular dimensions and is widely used in physics, chemistry, and electronics.
Defined using the SI prefix nano- (from Greek nanos, "dwarf") to denote one-billionth, adopted by the General Conference on Weights and Measures (CGPM) in 1960.
Nanometers are used to measure wavelengths of visible light (400–700 nm), semiconductor transistor sizes (currently 3–5 nm process nodes), DNA double helix width (2 nm), and atomic radii. The 2019 SI redefinition fixed the meter to the speed of light, making nanometer definitions exact to atomic precision.
SI prefix nano- adopted by the CGPM in 1960; nanometer became the standard unit for nanotechnology and optical wavelengths during the late 20th century.
Fathom to Nanometer conversion formula
The relationship between fathoms and nanometers:
To convert fathoms to nanometers, multiply the value in fathoms by 1.8288e+9. To reverse, multiply nanometers by 5.468066e-10.
How to use this converter
Type a value into the calculator. The result in nanometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Nanometer to Fathom converter for the reverse direction.
Step-by-step: convert fathoms to nanometers
- Write down the value in fathoms (ftm).
- Multiply that value by the factor 1.8288e+9.
- The product is the equivalent value in nanometers (nm).
- To reverse, multiply the nanometer value by 5.468066e-10.
Worked examples
Example 1 — Convert 1 ftm to nm:
1 × 1.8288e+9 = 1.8288e+9 nm
Example 2 — Convert 100 ftm to nm:
100 × 1.8288e+9 = 1.8288e+11 nm
Real-world example — Human-scale to atomic dimensions
One fathom equals one billion nanometers — the canonical metric conversion bridging everyday objects and atomic-scale features in physics, chemistry, and electronics.
1 ftm × 1.8288e+9 = 1.8288e+9 nm
Real-world example — Meter to nanoscale
One fathom equals one billion nanometers. Physics curricula use this conversion to teach orders of magnitude when introducing the electromagnetic spectrum.
1 ftm × 1.8288e+9 = 1.8288e+9 nm
Fathom to Nanometer conversion table
Standard reference values for converting fathoms to nanometers:
| Fathom [ftm] | Nanometer [nm] |
|---|---|
| 0.01 | 1.8288e+7 |
| 0.1 | 1.8288e+8 |
| 1 | 1.8288e+9 |
| 2 | 3.6576e+9 |
| 3 | 5.4864e+9 |
| 4 | 7.3152e+9 |
| 5 | 9.144e+9 |
| 10 | 1.8288e+10 |
| 20 | 3.6576e+10 |
| 30 | 5.4864e+10 |
| 40 | 7.3152e+10 |
| 50 | 9.144e+10 |
| 100 | 1.8288e+11 |
| 500 | 9.144e+11 |
| 1000 | 1.8288e+12 |
Frequently asked questions
How many nanometers is 1 fathom?
How do I convert fathoms to nanometers?
How do I convert nanometers back to fathoms?
How many nanometers is 100 fathoms?
Popular length unit conversions
Convert Fathom to other length units
Show all Fathom conversions
Metric / SI (7 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Sources & references
Conversion factor (1 ftm = 1.8288e+9 nm) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.