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Ohms Law Calculator – Calculates voltage, current, or resistance usin...

The Ohms Law Calculator calculates voltage, current, or resistance using Ohm's Law. This Ohms Law Calculator applies a standard electronics formula to solve for the unknown variable when the others are known. Keep units consistent for accurate results.

The formula behind this calculator: V = I x R. As a practical example: A circuit with 2 amps and 10 ohms of resistance has 20 volts across it. All results are calculated instantly in your browser — no data is stored or transmitted.

Ohms Law Calculator FAQ

What does the Ohms Law Calculator calculate?

Calculates voltage, current, or resistance using Ohm's Law.

What is the tolerance on resistor values?

Standard resistors come in E12 or E24 series with tolerances of 5% or 1%. The colour code includes a tolerance band (gold = 5%, silver = 10%, none = 20%).

Are results safe for real electrical work?

These calculations are for reference and educational purposes. Always consult a licensed electrician for actual wiring and electrical installation work.

Is my data sent to a server?

No — calculations run directly in your browser. Your inputs are not stored or transmitted.