Ohms Law Calculator
Calculate voltage, current, resistance, or power using Ohm's Law. Enter any two values to compute the others.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator uses Ohm's Law to compute the missing electrical values. Enter exactly two known values to calculate the other two.
- Enter any two values in the fields: Voltage (V), Current (I), Resistance (R), or Power (P).
- Leave the other two fields blank — the calculator will compute them.
- Click the "Calculate" button.
- View the results showing all four values and the formulas used.
Tips:
- Use any consistent unit system (e.g., volts, amps, ohms, watts). No unit conversion is performed.
- Resistance and current cannot be zero when used as inputs (division by zero).
- Enter numbers only (decimals allowed). Invalid inputs will show an error.
Previous Results
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Frequently Asked Questions
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance. The formula is V = I * R.
Enter any two values among Voltage (V), Current (I), Resistance (R), and Power (P). The calculator will compute the missing values using Ohm's Law and power formulas.
The calculator uses volts (V), amperes (A), ohms (Ω), and watts (W). You can enter decimal values for precision.