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Voltage calculator

Find the voltage across a component from the current and resistance using Ohm's law.

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Voltage Calculator

V = I × R · Current · Resistance

V = I × R  |  Voltage in Volts (Ohm's Law)

About the Voltage calculator

Find the voltage across a component from the current and resistance using Ohm's law.

How to use the Voltage calculator

  1. Choose what to solve for: V — Voltage or I — Current (A).
  2. Enter the Current (A) and Resistance (Ω) (or voltage and resistance).
  3. Press Calculate.

Formula and method

V = I × R, so I = V ÷ R.

Worked example

2 A flowing through a 6 Ω resistor produces 12 V.

Tips

  • Voltage is measured in volts, current in amperes and resistance in ohms.

Frequently asked questions

What is voltage?
The electrical pressure that pushes current through a circuit.