About Ohm’s Law Calculator
Calculate Voltage (V), Current (I), Resistance (R), and Electric Power (P).. Designed for accurate, instantaneous calculations with zero wait time.
Formula
V = I × R | P = V × I = I²R = V² / R
Example Calculation
For a 12V circuit with a 4 Ohm load, current is 3 Amps and power is 36 Watts.
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.