Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to find the other two.
How to Use the Ohm's Law Calculator
- 1 Enter any two known values (voltage, current, resistance, or power)
- 2 Select the appropriate units for each value
- 3 Click Calculate to find the unknown values
- 4 View the results and the formulas used
- 5 Use Clear All to start a new calculation
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Last updated: January 15, 2026 · v2.1