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Resistor Color Code Calculator

Convert 4-band resistor colors to ohms and reverse from resistance value back to color bands.

Bands to Value

Result

4.7 kΩ ±5%

Value to Bands (Reverse)

Yellow
Violet
Red
Gold
  • 100% free — no account needed
  • Runs in your browser
  • Nothing is uploaded

Frequently asked questions

Can I calculate resistor value from 4 color bands?

Yes. Select the 4 resistor bands and the calculator outputs resistance and tolerance instantly.

Does this tool support reverse lookup from ohms to colors?

Yes. Enter a resistance value and tolerance to find the matching 4-band color combination.

Who is this calculator useful for?

It is useful for electronics students, hobbyists, Arduino makers, and repair workflows.

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