Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's Law. Instant V=IR solver for electronics and electrical engineering.

Calculator

I want to find:

Current (I)

Resistance (R)

Enter both values above to calculate

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

V = Voltage (Volts, V) | I = Current (Amperes, A) | R = Resistance (Ohms, Ω) | P = Power (Watts, W)

What does Ohm's Law Calculator do?

Calculate voltage, current, resistance, and power using Ohm's Law. Instant V=IR solver for electronics and electrical engineering.

What should I check in the result?

Check units, rates, dates and assumptions. Compare a simple case by hand before using the result for a decision.