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Ohm's Law Calculator

Free Ohm's law calculator — solve for voltage, current, resistance, or power from any two values. Instant results in your browser.

Solve for

Voltage V (volts)

Current I (amperes)

Resistance R (ohms)

Calculated from other values

Power P (watts)

Examples

V = I × R and P = V × I. Enter any two known values; the unknown you select is calculated, and the remaining quantities are derived when possible.

Ohm's law

R = V / I

Voltage V

12 V

Current I

0.02 A

Resistance R

600 Ω

Power P

0.24 W

Uses DC / steady-state Ohm's law (V = IR) and electric power relations. Does not model AC impedance, reactance, or temperature-dependent resistance. All calculations run in your browser.