Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's Law and Watt's Law. Includes LED resistor calculator.

Calculator

Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's Law and Watt's Law.

⚡ Calculate — Enter Any 2 Values

🔄 Formula Wheel

VI×RP/I√(P×R)IV/RP/V√(P/R)RV/IV²/PP/I²PV×II²×RV²/R

💡 LED Resistor Calculator

📋 Formulas Reference

FindFormulaLaw
Voltage (V)V = I × ROhm's Law
Voltage (V)V = P / IWatt's Law
Voltage (V)V = √(P × R)Derived
Current (I)I = V / ROhm's Law
Current (I)I = P / VWatt's Law
Current (I)I = √(P / R)Derived
Resistance (R)R = V / IOhm's Law
Resistance (R)R = V² / PDerived
Resistance (R)R = P / I²Derived
Power (P)P = V × IWatt's Law
Power (P)P = I² × RDerived
Power (P)P = V² / RDerived

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