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Ohm's Law Calculator

Compute voltage across a component using Ohm’s Law, V = I·R, given the current flowing through it and its resistance. The most fundamental relationship in electronics, used in every circuit design from LED dropper-resistors to industrial power systems.

Current (A)

Resistance (Ω)

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Electrical

Ohm's Law & Power Calculator

Solve for voltage, current, resistance, or power in any DC circuit by entering just two known electrical values. Ideal for electronics hobbyists, electricians, and students checking circuit designs.

First Known Value

First Value Type

Second Known Value

Second Value Type

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Key differences

	Ohm's Law Calculator	Ohm's Law & Power Calculator
Category	Physics	Electrical
Inputs required	2	4
Result	Voltage (V)	Power (W)
What it does	Compute voltage across a component using Ohm’s Law, V = I·R, given the current flowing through it and its resistance. The most fundamental relationship in electronics, used in every circuit design from LED dropper-resistors to industrial power systems.	Solve for voltage, current, resistance, or power in any DC circuit by entering just two known electrical values. Ideal for electronics hobbyists, electricians, and students checking circuit designs.