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Ohm's Law Calculator
Solve for voltage, current, or resistance using V = I × R.
Inputs
Enter your values below.
Result
Your answer appears here.
Enter values and press Calculate — the result appears here.
How it works
The formula behind this calculator.
V = I × R ⇔ I = V / R ⇔ R = V / I ⇔ P = V × I
- V
- Voltage (V)
- I
- Current (A)
- R
- Resistance (Ω)
- P
- Power (W)
Voltage equals current times resistance. The same triangle solves any pair given the other two. Power = V × I = I²R = V²/R.
Example: 9V across 1kΩ → I = 9 mA, P = 81 mW
Ref: Ohm (1827)
Tips
- 💡 V = I × R, I = V / R, R = V / I. Memorize all three.
- 💡 Power: P = V × I = I² × R = V² / R.