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Ohm's Law Calculator

Solve for voltage, current, or resistance. Provide any two values and the calculator completes the remainder automatically.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Voltage (V)

Current (A)

Resistance (Ω)

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.