Voltage Calculator

Calculate voltage, current, or resistance using Ohm’s Law (V = I × R)

Voltage (V) in volts

Current (I) in amperes

Resistance (R) in ohms

Calculation Result

Enter any two values to calculate the third.

Ohm’s Law Formula

V = I × R

Where:

V = Voltage (volts)
I = Current (amperes)
R = Resistance (ohms)

Frequently Asked Questions

What is Ohm’s Law?

Ohm’s Law states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them.

How do I use this voltage calculator?

Simply enter any two known values (voltage, current, or resistance) and the calculator will automatically compute the missing value using Ohm’s Law.

What units should I use?

This calculator uses standard units: volts (V) for voltage, amperes (A) for current, and ohms (Ω) for resistance. Make sure your values are in these units for accurate results.

Can I calculate power with this tool?

While this calculator focuses on voltage, current, and resistance, we have a separate Power Calculator that can calculate electrical power (P = V × I).