Ohm's Law
Solve V = I × R — enter any two of voltage, current, and resistance to find the third
V = I × R → 12 V = 2 A × 6 Ω
Voltage (V) (V)
12 V
Current (I) (A)
2 A
Resistance (R) (Ω)
6 Ω
Power (P = V × I)
24 W
About this calculator
The Ohm's Law Calculator helps you find voltage, current, or resistance when you know the other two values. Based on the fundamental formula V = I × R, this tool is essential for electronics, circuit design, and physics coursework. Enter any two values to instantly calculate the missing third.
Common examples
- V = 5 A × 10 Ω = 50 V
- I = 120 V ÷ 60 Ω = 2 A
- R = 9 V ÷ 0.3 A = 30 Ω
- V = 0.5 A × 220 Ω = 110 V
- I = 12 V ÷ 4 Ω = 3 A