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Ohm's Law Calculator

Calculate voltage, current, resistance, or power using Ohm's Law. Fill in the two known values in any one formula row and click Calculate.

Helpful Notes:

The Four Variables

E = Electromotive Force (Voltage, in Volts)
I = Intensity (Current, in Amps)
R = Resistance (in Ohms, Ω)
P = Power (Wattage, in Watts)

How to Use

Pick the formula that matches the two values you already know. Enter those two values in that row and click Calculate. Only fill out one row at a time for accurate results.

Other Tools:

Results:

Enter Two Known Values:

⚠ Please fill out only one formula row at a time for accurate results.

Electromotive Force (Voltage)

E = I × R

A × Ω

E = P / I

W ÷ A

E = √(P × R)

W × Ω

Power (Wattage)

P = E × I

V × A

P = I² × R

A² × Ω

P = E² / R

V² ÷ Ω

Intensity (Amperage)

I = E / R

V ÷ Ω

I = P / E

W ÷ V

I = √(P / R)

W ÷ Ω

Resistance (Ohms)

R = E / I

V ÷ A

R = P / I²

W ÷ A²

R = E² / P

V² ÷ W