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Resistor Color Code Calculator

Read common 4-band and 5-band resistor colors and their tolerance range.

Browser processingEditable exampleCopy · download · print

1. Set up your calculation

Reads standard digit/multiplier/tolerance bands; orientation and faded colors must be checked on the component. Six-band temperature coefficients and special markings are not included.

2. Review & use your result

Review the example inputs, then use read resistor.

Report / export preview

Generated file contents

Using Resistor Color Code Calculator

Read common 4-band and 5-band resistor colors and their tolerance range.

Enter number of bands and first digit. Try the example to see the format.
Read resistor 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: Resistance (Ω) — 1,000; Resistance (kΩ) — 1.
Change the inputs and generate a new result to compare it.

Questions & answers

How do I use this tool?

Read common 4-band and 5-band resistor colors and their tolerance range. Load the editable example, replace its values and use the main action button.

What should I check before using the result?

Reads standard digit/multiplier/tolerance bands; orientation and faded colors must be checked on the component. Six-band temperature coefficients and special markings are not included.

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.

What changes between four and five bands?

Four bands use two significant digits, a multiplier and tolerance. Five bands use three significant digits before the multiplier and tolerance. The color preview follows the selected order.