Resistor Color Code Calculator
Decode common 4-band and 5-band resistor colors into resistance and tolerance.
Enter your values
How to use Resistor Color Code Calculator
- Enter Band count, Band 1, Band 2, Band 3 (5-band only), Multiplier, Tolerance.
- Choose the options that match your task and leave genuinely optional fields blank when they do not apply.
- Select Calculate / Run and review the result panel.
- Check units, assumptions and any limitations shown on the page before using the result for an important decision.
About this tool
Decode common 4-band and 5-band resistor colors into resistance and tolerance. Use the form above to enter Band count, Band 1, Band 2, Band 3 (5-band only), Multiplier, Tolerance. The calculation or transformation runs locally in your browser.
Method
Color bands map significant digits and a power-of-ten multiplier to resistance, with the tolerance band defining the expected resistance range.
Frequently asked questions
What does Resistor Color Code Calculator do?
Decode common 4-band and 5-band resistor colors into resistance and tolerance.
What information do I need?
The form is built around these inputs: Band count, Band 1, Band 2, Band 3 (5-band only), Multiplier, Tolerance.
Does my input get uploaded?
For this tool, the calculation or transformation runs in your browser. Your entered values are not intentionally sent to ToolboxKart for processing.
Is this tool free to use?
Yes. You can use this ToolboxKart tool without creating an account.