FREE · CONSTRUCTION & TRADE CALCULATORS
Resistor Color Code Calculator.
Decode 3, 4, 5 and 6-band resistor colours into resistance and tolerance, or find the bands for a value, with a drawn resistor and nearest standard values.
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How to use Resistor Color Code Calculator
Choose the number of bands and pick each colour, or switch to Resistance → colours and type a value such as 4k7 or 220. The preview draws the resistor.
How it works
Digit bands give the significant figures, the multiplier band the power of ten, then tolerance and temperature coefficient. Nearest E12, E24 and E96 values are listed for comparison.
Example
Yellow, violet, red, gold is 4.7 kΩ ±5 %, from 4.465 to 4.935 kΩ.
Questions about Resistor Color Code Calculator
Is Resistor Color Code Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Colours follow IEC 60062; some precision parts use other codes. Everything is calculated in your browser; nothing you type is uploaded. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.