Text & Web Utilities
Resistor Color Code Calculator
Decode a resistor's color bands.
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Enter details
Result
Resistance
0 Ω
±1% tolerance
About the Resistor Color Code Calculator
Read a resistor without squinting at the bands. Choose the first two digit bands, the multiplier, and the tolerance and the calculator returns the resistance (in Ω, kΩ, or MΩ) with its tolerance. It's a handy reference for electronics hobbyists and students working with through-hole resistors.
How to use the Resistor Color Code Calculator
- 1Enter your the resistor's color bands.
- 2Read the result instantly — it recalculates as you type.
- 3Adjust the numbers to model different scenarios.
Frequently asked questions
How do I read a resistor color code?
The first two bands are digits, the third is the multiplier (power of ten), and the fourth is tolerance. This tool decodes it into ohms.
What do the colors mean?
Black 0, brown 1, red 2, orange 3, yellow 4, green 5, blue 6 — for the digit and multiplier bands. Gold/silver denote tolerance.