Resistor Color Code
Decode 4, 5, or 6-band resistors to their resistance value and tolerance.
Tolerance
±—%Min Value
—Max Value
—How It Works
Resistors use colored bands to indicate their resistance value, tolerance, and temperature coefficient. Each color represents a digit (0–9), a multiplier, or a tolerance percentage.
Select the number of bands on your resistor, pick the color for each band, and the calculator will decode the value instantly.
Formula
4-band:
R = (D₁×10 + D₂) × Multiplier ± Tol%
5-band:
R = (D₁×100 + D₂×10 + D₃) × Multiplier ± Tol%
Last Updated: February 28, 2026
Disclaimer: For reference purposes only. Always verify critical resistance values with a multimeter.
About the Resistor Color Code
This resistor color code computes engineering and applied physics quantities for circuits, fluids, and mechanical systems. Decode 4, 5, or 6-band resistor color codes.
Use for coursework, lab estimates, and quick technical calculations.
Adjust the inputs above to model your specific scenario with the Resistor Color Code.
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