Convert Foot to Classical Electron Radius
Convert feet to classical electron radii instantly. 1 foot = 1.081641e+14 classical electron radius — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Classical Electron Radius to Foot converter for the reverse conversion.
Units explained
Foot
A foot is an Imperial and US customary unit of length equal to 12 inches or exactly 0.3048 meters. It is the most commonly used unit of length in everyday measurement in the United States.
The foot's origin is literally the length of a human foot, used as a measurement standard since antiquity. The English foot was standardized at various points in history; the modern international foot (0.3048 m exactly) was fixed by the 1959 International Yard and Pound Agreement.
Feet are used in the US for body height, building dimensions, room sizes, road sign clearances, aviation altitude (feet above sea level), and most everyday distance estimation. The UK uses feet informally for height despite officially being metric.
Used since antiquity; standardized to 0.3048 m exactly by the International Yard and Pound Agreement of 1959. Aviation worldwide uses feet for altitude despite metric adoption elsewhere.
Classical Electron Radius
The classical electron radius is approximately 2.818×10⁻¹⁵ meters. It is the radius an electron would have if its mass were entirely electromagnetic and its charge distributed over its surface.
Defined classically in the early 20th century. The CODATA 2018 value of 2.8179403262×10⁻¹⁵ m is derived from the elementary charge, electron rest mass, and the Coulomb constant.
The classical electron radius appears in scattering theory (Thomson scattering cross-section), particle physics estimates, and historical electromagnetism. It is a calculational tool, not the actual size of an electron, which has no measured extent.
Concept dates to the early 20th-century classical electromagnetism; CODATA 2018 provides the current reference value.
Foot to Classical Electron Radius conversion formula
The relationship between feet and classical electron radii:
To convert feet to classical electron radii, multiply the value in feet by 1.081641e+14. To reverse, multiply classical electron radii by 9.245211e-15.
How to use this converter
Type a value into the calculator. The result in classical electron radii updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Classical Electron Radius to Foot converter for the reverse direction.
Step-by-step: convert feet to classical electron radii
- Write down the value in feet (ft).
- Multiply that value by the factor 1.081641e+14.
- The product is the equivalent value in classical electron radii (rₑ).
- To reverse, multiply the classical electron radius value by 9.245211e-15.
Worked examples
Example 1 — Convert 1 ft to rₑ:
1 × 1.081641e+14 = 1.081641e+14 rₑ
Example 2 — Convert 100 ft to rₑ:
100 × 1.081641e+14 = 1.081641e+16 rₑ
Real-world example — Meter to nanoscale
One foot equals one billion classical electron radii. Physics curricula use this conversion to teach orders of magnitude when introducing the electromagnetic spectrum.
1 ft × 1.081641e+14 = 1.081641e+14 rₑ
Real-world example — Human-scale to atomic dimensions
One foot equals one billion classical electron radii — the canonical metric conversion bridging everyday objects and atomic-scale features in physics, chemistry, and electronics.
1 ft × 1.081641e+14 = 1.081641e+14 rₑ
Foot to Classical Electron Radius conversion table
Standard reference values for converting feet to classical electron radii:
| Foot [ft] | Classical Electron Radius [rₑ] |
|---|---|
| 0.01 | 1.081641e+12 |
| 0.1 | 1.081641e+13 |
| 1 | 1.081641e+14 |
| 2 | 2.163282e+14 |
| 3 | 3.244923e+14 |
| 4 | 4.326564e+14 |
| 5 | 5.408205e+14 |
| 10 | 1.081641e+15 |
| 20 | 2.163282e+15 |
| 30 | 3.244923e+15 |
| 40 | 4.326564e+15 |
| 50 | 5.408205e+15 |
| 100 | 1.081641e+16 |
| 500 | 5.408205e+16 |
| 1000 | 1.081641e+17 |
Frequently asked questions
How many classical electron radii is 1 foot?
How do I convert feet to classical electron radii?
How do I convert classical electron radii back to feet?
How many classical electron radii is 100 feet?
Popular length unit conversions
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 ft = 1.081641e+14 rₑ) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.