4-band resistor
- Input
- brown-black-red-gold
- Expected output
- 1 kΩ ±5%
Brown (1), black (0) → 10; red ×100 → 1,000 Ω.
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resistor color code calculator
Instead of doing the math by hand, select the color of each resistor band, digits, multiplier, tolerance and, on 6-band resistors, temperature coefficient, and see the computed value instantly, formatted in Ω, kΩ or MΩ.
Brown (1), black (0) → 10; red ×100 → 1,000 Ω.
Brown-black-black (100) × red (×100) = 10,000 Ω; brown = ±1% and 100 ppm/K.
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.
Yes. Pick the band count and the tool automatically adjusts how many digit bands to use (2 on 4-band resistors, 3 on 5- and 6-band resistors) and whether to show the temperature-coefficient band (only on 6-band).
Yes. Besides the nominal value, it computes the minimum and maximum acceptable value from the selected tolerance percentage.
No, gold and silver only appear in the multiplier and tolerance pickers, because they don't represent any significant digit in the color code.
| 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% | — |
Lookup and calculation happen locally in your browser; no color or value is ever sent to a server.