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Resistor Colour Code Calculator Bi-Directional Discrete-resistor colour-code online calculator:   Resistance Calculator     black brown red orange yellow green blue violet gray white black brown red orange yellow green blue violet gray white black brown red orange yellow green blue violet gray white gold silver   gold silver none K M ±5% ±10% ±20% Just select either the band colour you have to get the value, or select the value you want to get the band colour!