Engineering

Ohm's Law Calculator

Calculate voltage, current, resistance and power using Ohm's law

Solve For*

Voltage (V)

Current (A)

Resistance (Ω)

Power (W)

Result

12.0000V

Power (P)

24.0000W

P = V × I

Ohm's Law:
  V = I × R
  I = V / R
  R = V / I

Power:
  P = V × I = I² × R = V² / R

Supported inputs

Input	Description
Solve For	The target variable to calculate voltage · current · resistance · power
Voltage (V) (V)	Electrical voltage in volts
Current (A) (A)	Electrical current in amperes
Resistance (Ω) (Ω)	Electrical resistance in ohms
Power (W) (W)	Electrical power in watts

Formula

Ohm's Law:
  V = I × R
  I = V / R
  R = V / I

Power:
  P = V × I = I² × R = V² / R

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