Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's Law. Professional tool with unit conversions and educational mode.

Enter Current and Resistance (or Power and Current)

⚡ Try These Examples:

Disclaimer

This calculator is provided as-is for educational and informational purposes only. While we strive for accuracy, always verify calculations with professional standards and local electrical codes. Use at your own risk. For critical applications, consult a licensed professional electrician.

Ohm's Law Formulas

Voltage:

V = I × R

V = P / I

V = √(P × R)

Current:

I = V / R

I = P / V

I = √(P / R)

Resistance:

R = V / I

R = V² / P

R = P / I²

Power:

P = V × I

P = I² × R

P = V² / R

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