Enter any two of voltage, current and resistance, leaving the third blank, to solve for the missing value using Ohm's Law (V = I × R), along with power.
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Ohm's Law states that voltage equals current multiplied by resistance: V = I × R. This calculator rearranges the formula depending on which value you leave blank: current = voltage ÷ resistance, or resistance = voltage ÷ current. Power is then calculated as voltage × current (P = VI) using the completed set of values.
Leave exactly one field blank, the one you want to solve for. If all three are filled in, the calculator will ask you to leave one blank.
You need at least two of the three values (voltage, current, resistance) filled in for the calculator to solve for the third.
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