Free Online Resistance Calculator

Calculate resistance from voltage and current.

V
A
Result Unit
Resistance: -
Formula: R = V ÷ I

About This Tool

This free online resistance calculator solves resistance from voltage and current using Ohm’s law. Enter voltage and current to calculate resistance in ohms, kilo-ohms, or mega-ohms.

It is useful for checking circuit values, selecting components, electronics coursework, and troubleshooting where you need R = V / I.

Benefits and Use Cases

  • Calculate resistance from voltage and current
  • Check circuit and component values
  • Support electronics learning and repair work
  • Convert between voltage, current, and resistance units

How to Use

  1. Enter the voltage.
  2. Enter the current.
  3. Select the correct units.
  4. Click Calculate.

Frequently Asked Questions

What formula does this resistance calculator use?

It uses resistance = voltage / current.

What inputs do I need?

You need voltage and current.