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Electric Field Strength Calculator

Easily calculate the strength of an electrical field with our free calculator.

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Electric Field Strength Calculator

Calculate electric field strength using voltage and distance, force and charge, or point charge and distance.

Result

Electric Field Strength: —

—

Formula: E = V ÷ d

Enter values to calculate the electric field strength.

Results are estimates only. For electrical design, high-voltage work, insulation selection, or compliance decisions, consult a qualified electrical professional or relevant standard.
Methodology & Assumptions

Voltage & Distance: E = V ÷ d. This estimates the electric field between two points or conductors when voltage and separation distance are known.

Force & Charge: E = F ÷ q. This calculates field strength from the force experienced by a test charge.

Point Charge: E = kQ ÷ r², where k = 8.9875 × 10⁹ N·m²/C². This estimates the field strength around a single point charge.

Units: Electric field strength may be shown as V/m or N/C. These are equivalent units.

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