Ohm's Law Calculator
Enter any two of voltage, current, resistance and power to get the other two.
Runs entirely in your browser.
Ohm's Law: Voltage, Current, Resistance and Power
Fill in exactly two boxes and leave the other two empty.
About Ohm's Law Calculator
Ohm's law says V = I × R: voltage equals current times resistance. Power adds a second relationship, P = V × I, and between them any two of the four values determine the other two.
Fill in exactly two boxes and the remaining two are worked out, along with which formula was used. Leave more or fewer than two and it will say so rather than guessing which you meant.
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