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Ohm’s Law Calculator

Find voltage, current, resistance and power from two known electrical quantities.

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1. Set up your calculation

Positive DC values for an ideal resistor: V = I × R and P = V × I. This does not model AC reactance, component ratings or electrical installation safety.

2. Review & use your result

Review the example inputs, then use calculate circuit.

Report / export preview

Generated file contents

Using Ohm’s Law Calculator

Find voltage, current, resistance and power from two known electrical quantities.

Enter known quantities and voltage (v). Try the example to see the format.
Calculate circuit and review the result, including the assumptions shown below the inputs.
Copy, download or print your result. Editing an input clears the previous result.

Example

The included example: Voltage (V) — 12; Current (A) — 0.02.
Change the inputs and generate a new result to compare it.

Questions & answers

How do I use this tool?

Find voltage, current, resistance and power from two known electrical quantities. Load the editable example, replace its values and use the main action button.

What should I check before using the result?

Positive DC values for an ideal resistor: V = I × R and P = V × I. This does not model AC reactance, component ratings or electrical installation safety.

Are my entries saved?

Processing runs in your browser without a tool account or saved history. Download your result to keep a copy. Website advertising follows our privacy information.

Can I export or print it?

Copy and file download are available after generating a result. Print produces a clean copy of the visible result; use your browser’s Save as PDF option if needed.

Which fields should I fill in?

Choose the pair of quantities you know. Only those two fields are shown and used. The other two quantities are derived using ideal-resistor DC formulas.