The Ohm's Law Calculator solves voltage, current, resistance and power from any two known values. Units scale from millivolts to kilovolts and from milliamps to kiloamps, so small-signal and distribution work both fit.
Ohm's Law Calculator (V, I, R, P Solver)
Enter any two of voltage, current, resistance and power and solve the other two. Includes unit prefixes, a running-cost estimate and the formula used for each result.
Known values (enter any two)
Running cost (optional)
Results
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voltage
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current
Notes
About Ohm's Law Calculator (V, I, R, P Solver)
Features
- Enter any two of V, I, R and P
- All four values returned
- mV, V and kV
- mA, A and kA
- Ohms and watts with prefixes
How to Use
- Enter any two of voltage, current, resistance and power.
- Pick the units for each.
- Read the remaining two values.
Examples
Example: 120 V at 10 A -> 12.0000 ohms and 1200.0000 W.
Benefits
- Covers every Ohm's law rearrangement in one place
- Unit prefixes remove a common factor-of-1000 error
Frequently Asked Questions
What does this calculator do?
Enter any two of voltage, current, resistance and power and solve the other two. Includes unit prefixes, a running-cost estimate and the formula used for each result.
Is my data stored?
No. Everything runs in your browser; nothing is uploaded, saved or logged.