Ohm's Law Calculator

The fundamental tool for electrical circuit design and analysis.

Circuit Parameters

Enter exactly two values to calculate the remaining variables.

Voltage (V)

Volts

Current (I)

Amps

Resistance (R)

Ω

Power (P)

Watts

Law of Electricity

Input exactly two known values to solve for the full electrical state of your component or circuit.

Voltage (V)I × R

Current (I)V / R

Resistance (R)V / I

Electrical Power (Watts) is the product of Voltage and Current. If you double the voltage in a fixed resistance circuit, the power actually quadruples!

Always ensure your components (resistors, wires, fuses) are rated for the Power (Watts) they will be handling to prevent overheating.

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Ohm's Law Calculator

Core Formulas

Power Triangle

Safety Tip

Quick Links