Ohm's Law Calculator
Calculate voltage, current, or resistance using Ohm's Law (V = I × R)
How to use this calculator:
⚡ Calculate Voltage (V)
Use case: Find voltage when you know current and resistance.
Example: I=3A, R=4Ω → V=12V
🔌 Calculate Current (I)
Use case: Find current when you know voltage and resistance.
Example: V=12V, R=4Ω → I=3A
🔧 Calculate Resistance (R)
Use case: Find resistance when you know voltage and current.
Example: V=12V, I=3A → R=4Ω
Calculate Electrical Values
Choose what you want to calculate using Ohm's Law
Formula: V = I × R
Voltage (Volts) = Current (Amperes) × Resistance (Ohms)