Voltage, Current, Resistance & Wattage Ohm's Law Calculator

Enter any two of the following values and click the calculation button.
The missing values will be calculated. Enter only two values.
Voltage or volt (E or V) = Volts
Amperage or current (I) = Amps
Resistivity or resistance (R) = Ohms Ω
Wattage or power (P) = Watts
 
   
Click on any box to clear its value, or

Ohm's Law
To use the above wheel, simply choose the quadrant corresponding to the variable you want to calculate, then select the segment corresponding to the variables that you know the values of.