Resistor Color Code Calculator
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Resistor Color Code Calculator
Pick the color bands to get the resistance value and tolerance.
Supports 4- and 5-band resistors. Pick the colors to see the resistance (Ω/kΩ/MΩ) and tolerance.
How to use
- 1
Choose 4 or 5 bands.
- 2
Pick each band's color and the resistance and tolerance update instantly.
- 3
Check the band order on the resistor graphic.
FAQ
Is this tool free?
Yes — it is completely free to use, with no account or sign-up required.
What is this tool?
Read a resistor's value from its color bands. Choose 4 or 5 bands, pick each band's color, and it computes the resistance (Ω/kΩ/MΩ/GΩ) and tolerance (±%) while previewing the bands on a resistor graphic — handy for quickly checking color codes when working with electronics. Everything runs in your browser, free with no install.