TOOLS UNIVERSE / V=IR

Ohm’s Law Calculator

Use Ohm’s Law Calculator online for free — fast, clear and without registration.

● Local in your browser · no upload
230V2A115Ω460W

V = I × R; P = V × I

METHOD

Calculation, assumptions and sources

Formula used

V = I × R; P = V × I = I²R = V²/R

What is included

Calculate voltage, current, resistance and power from any two known electrical values.

Assumptions and limits

Ideal DC relationships and constant use are assumed. AC power factor, startup current and tariff tiers are not automatically included.

GUIDE

Ohm’s Law Calculator

Calculate voltage, current, resistance and power from any two known electrical values.

Enter the required values or content, adjust the options and then review the detailed result.

FAQ

Frequently asked questions

What can I do with Ohm’s Law Calculator?

Calculate voltage, current, resistance and power from any two known electrical values.

How do I use Ohm’s Law Calculator?

Enter the required values or content, adjust the options and then review the detailed result.

Are my data uploaded?

No. Inputs and files for this tool are processed locally in your browser.

Is this tool free?

Yes. Every feature is free and requires no registration.

Does it work on mobile?

Yes. The interface is optimized for iPhone, Android, tablets and desktop computers.