Resistor color code

Decode resistor bands into precise ohmic values.

Implements IEC 60062 color mappings so you can translate 4, 5, or 6-band resistors into resistance, tolerance, and temperature coefficient.

1.00 kΩ

Resistance

±5%

Tolerance

N/A

Tempco

Quick presets

Select 6-band for military temperature coefficients.

Inputs

Band count

Band 1 digit

Band 2 digit

Multiplier band

Tolerance band

Decoded value

Resistance

1.00 kΩ

Tolerance

±5%

Tempco

N/A

Tolerance guidance

Gold = 5%, Silver = 10%, Brown = 1%, Red = 2%, Green = 0.5%, Blue = 0.25%, Violet = 0.1%, Gray = 0.05%.

Temperature coefficients

Brown 100 ppm, Red 50 ppm, Orange 15 ppm, Yellow 25 ppm, Blue 10 ppm, Violet 5 ppm per °C.

Design notes

Five-band resistors put three digits before the multiplier; use them on precision analog nodes.
Temperature coefficients matter on references and dividers that see wide swing environments.
Always confirm the tolerance band exists—unbanded parts default to ±20%.