ONE FORMULA, ONE ANSWER
Point Charge Electric Field Calculator
Calculate the field magnitude of an isolated point charge in vacuum. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Electric field magnitude E
Enter values and select Calculate.
E = |q|/(4πε₀r²)
Assumptions
Required: r>0 and an isolated electrostatic point charge in vacuum. Only magnitude is returned. Direction, dielectric media and vector sums of other charges are excluded.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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