Convert Meter to Classical Electron Radius
Convert meters to classical electron radii instantly. 1 meter = 3.548691e+14 classical electron radius — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Classical Electron Radius to Meter converter for the reverse conversion.
Units explained
Meter
The meter is the SI base unit of length. Since 2019, the meter has been defined by fixing the numerical value of the speed of light in vacuum to exactly 299,792,458 meters per second. Every other SI length unit derives from the meter.
The meter was originally defined in 1793 by the French Academy of Sciences as one ten-millionth of the distance from the equator to the North Pole along a meridian through Paris. It has been redefined multiple times — by physical prototype, then by atomic transitions, and finally in 2019 by fundamental physical constants.
The meter is the international standard for length in science, engineering, construction, athletics, and everyday measurement in metric countries. It underpins definitions of area (m²), volume (m³), and most derived SI units.
Established 1793 in France; ratified internationally via the Metre Convention 1875; redefined in 1960, 1983, and most recently 2019 when the SI redefinition fixed it to the speed of light.
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.
Meter to Classical Electron Radius conversion formula
The relationship between meters and classical electron radii:
To convert meters to classical electron radii, multiply the value in meters by 3.548691e+14. To reverse, multiply classical electron radii by 2.81794e-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 Meter converter for the reverse direction.
Step-by-step: convert meters to classical electron radii
- Write down the value in meters (m).
- Multiply that value by the factor 3.548691e+14.
- The product is the equivalent value in classical electron radii (rₑ).
- To reverse, multiply the classical electron radius value by 2.81794e-15.
Worked examples
Example 1 — Convert 1 m to rₑ:
1 × 3.548691e+14 = 3.548691e+14 rₑ
Example 2 — Convert 100 m to rₑ:
100 × 3.548691e+14 = 3.548691e+16 rₑ
Real-world example — Meter to nanoscale
One meter equals one billion classical electron radii. Physics curricula use this conversion to teach orders of magnitude when introducing the electromagnetic spectrum.
1 m × 3.548691e+14 = 3.548691e+14 rₑ
Real-world example — Human-scale to atomic dimensions
One meter equals one billion classical electron radii — the canonical metric conversion bridging everyday objects and atomic-scale features in physics, chemistry, and electronics.
1 m × 3.548691e+14 = 3.548691e+14 rₑ
Meter to Classical Electron Radius conversion table
Standard reference values for converting meters to classical electron radii:
| Meter [m] | Classical Electron Radius [rₑ] |
|---|---|
| 0.01 | 3.548691e+12 |
| 0.1 | 3.548691e+13 |
| 1 | 3.548691e+14 |
| 2 | 7.097382e+14 |
| 3 | 1.064607e+15 |
| 4 | 1.419476e+15 |
| 5 | 1.774346e+15 |
| 10 | 3.548691e+15 |
| 20 | 7.097382e+15 |
| 30 | 1.064607e+16 |
| 40 | 1.419476e+16 |
| 50 | 1.774346e+16 |
| 100 | 3.548691e+16 |
| 500 | 1.774346e+17 |
| 1000 | 3.548691e+17 |
Frequently asked questions
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Sources & references
Conversion factor (1 m = 3.548691e+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.