Resistor Color Code Calculator
Decode resistor color bands to resistance values or find color bands for a given resistance. Supports 4-band resistors with tolerance. Visual resistor diagram.
How to Use
Choose a mode
Select Color → Value to decode color bands, or Value → Color to find bands for a known resistance.
Select color bands (Color → Value)
Pick the color for each of the 4 bands from the dropdowns.
Enter resistance (Value → Color)
Type a resistance value in Ohms, kΩ, or MΩ.
Read results
See the resistance value and tolerance, or the corresponding color bands with a visual diagram.
Features
4-Band Decoding
Supports all standard 4-band resistors with tolerance band.
Visual Diagram
Color-accurate resistor diagram showing each band.
Bidirectional
Convert colors to values or values to colors.
Tolerance Info
Shows the tolerance percentage for each tolerance color.
Frequently Asked Questions
Recommended Reading
Practical guides matched to this calculator, its inputs, and the result users need to trust.