Red as a digit
- Input
- red
- Expected output
- 2
Red is digit 2 and multiplier ×100, depending on the band position.
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resistor color code
The resistor color code uses 12 colors to encode digits, multiplier, tolerance and, on 6-band resistors, the temperature coefficient. The chart below (opening straight into the tool's Chart mode) lists the official value for every color, verified against IEC 60062.
Red is digit 2 and multiplier ×100, depending on the band position.
Gold is never a digit, only multiplier (×0.1) or tolerance (±5%).
Start from the end opposite the tolerance band. The tolerance band is usually gold or silver (or visibly set apart from the rest with a wider gap), so it's always read last, and tells you which end to begin at.
Twelve: black, brown, red, orange, yellow, green, blue, violet, grey, white, gold and silver. The first ten represent digits 0 through 9; gold and silver only ever appear as multiplier or tolerance.
Grey, at 1 ppm/K, the most thermally stable color on the chart. Black has the highest, at 250 ppm/K.
It's the convention for older 3-band resistors (2 digits + multiplier, with no tolerance band at all). In that case, a default ±20% tolerance is assumed.
| Color | Digit | Multiplier | Tolerance | Temp. Coeff. |
|---|---|---|---|---|
| 0 | ×1 | — | 250 ppm/K | |
| 1 | ×10 | ±1% | 100 ppm/K | |
| 2 | ×100 | ±2% | 50 ppm/K | |
| 3 | ×1,000 | — | 15 ppm/K | |
| 4 | ×10,000 | — | 25 ppm/K | |
| 5 | ×100,000 | ±0.5% | 20 ppm/K | |
| 6 | ×1,000,000 | ±0.25% | 10 ppm/K | |
| 7 | ×10,000,000 | ±0.1% | 5 ppm/K | |
| 8 | ×100,000,000 | ±0.05% | 1 ppm/K | |
| 9 | ×1,000,000,000 | — | — | |
| — | ×0.1 | ±5% | — | |
| — | ×0.01 | ±10% | — | |
| — | — | ±20% | — |
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