Maker & Reference
Resistor Color Code Calculator
Decode any resistor's color bands to ohms + tolerance. Supports 4-band (standard), 5-band (precision), and 6-band (with temperature coefficient).
Resistance
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- Min (tolerance)
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- Max (tolerance)
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- Raw ohms
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- E-series
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Color code chart
| Color | Digit | Multiplier | Tolerance |
|---|---|---|---|
| ⬛ Black | 0 | ×1 | — |
| 🟫 Brown | 1 | ×10 | ±1% |
| 🟥 Red | 2 | ×100 | ±2% |
| 🟧 Orange | 3 | ×1k | — |
| 🟨 Yellow | 4 | ×10k | — |
| 🟩 Green | 5 | ×100k | ±0.5% |
| 🟦 Blue | 6 | ×1M | ±0.25% |
| 🟪 Violet | 7 | ×10M | ±0.1% |
| ⬜ Gray | 8 | ×100M | ±0.05% |
| ⬜ White | 9 | ×1G | — |
| 🟨 Gold | — | ×0.1 | ±5% |
| ⬜ Silver | — | ×0.01 | ±10% |
FAQ
Which way to read? +
The tolerance band (gold/silver) is on the right side and slightly separated. Read from left to right. If no gold/silver, the wider gap separates last band from the rest.
4-band vs 5-band? +
4-band: 2 digits + multiplier + tolerance. 5-band: 3 digits + multiplier + tolerance — used on precision resistors (1% or tighter).
What is tempco (band 6)? +
Temperature coefficient — how much resistance changes per degree Celsius. Important for precision circuits. Brown=100 ppm/°C is standard.