ENGINEERING / FREE ONLINE TOOL
Ohm’s Law Calculator
Find the missing link between voltage, current, and resistance.
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A little guidance.
Solve V = I × R for a simple resistive DC circuit. Enter two known quantities to calculate the third and the power dissipated.
How it works
- Select the quantity you want to calculate.
- Enter the other two values in volts, amperes, or ohms.
- Calculate to see the result and power in watts.
Good to know.
Can I use this for AC circuits?
This calculator uses the ideal resistive DC relationship. It does not model impedance, phase, nonlinear components, component tolerances, or transient behavior.