Ohm's Law Calculator
Calculate voltage, current, resistance and power from any two known electrical values.
Hit Calculate to see your circuit load
Metrics appear after calculation
Your explanation appears here
Compare calculated watts, current and voltage with fuse, wire, resistor and supply ratings before building a real circuit.
Your checks appear after calculation
Test a new supply voltage or resistance without changing your main result.
Calculate your baseline first
You need any two known electrical values: voltage, current, resistance or power. The calculator derives the other two using V=I×R and P=V×I.
Power is calculated as P = V × I. For example, 12 volts at 2 amps equals 24 watts.
It helps estimate electrical relationships and load size, but it does not certify safety. Real circuits require correct wiring, insulation, fusing, heat dissipation and compliance with applicable electrical codes.
Results are estimates generated locally in your browser from Ohm's Law formulas. They are for informational and educational purposes only, not electrical engineering approval or wiring advice. Always verify component ratings, heat dissipation, fuse protection and local electrical code requirements before using any calculated values in a live circuit. VisionVix accepts no liability for decisions based on this output.
