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Ohm's Law Calculator (V = I × R)

Find voltage from current and resistance.

Last updated: 25 Aug 2026

Quick answer

Ohm's law states V = I × R. For example, 2 amps through 10 ohms gives 20 volts. Enter the current and resistance above to find the voltage.

Ohm's law relates voltage, current and resistance: V = I × R. Enter the current (amps) and resistance (ohms) to find the voltage.

How to use Ohm's law

  1. 1 Enter the current in amps (I).
  2. 2 Enter the resistance in ohms (R).
  3. 3 We compute voltage V = I × R.

Frequently asked questions

What is Ohm's law?
It states that voltage equals current times resistance: V = I × R.
How do I find current or resistance?
Rearrange: I = V ÷ R and R = V ÷ I.
What are the units?
Voltage in volts (V), current in amps (A), resistance in ohms (Ω).

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