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AUTIXON / Electronics & Instrumentation
Calculation10 × 100 Ω = 1 kΩ
✓ Exact 4-band code
01 / Electronics & Instrumentation
The first two bands form a two-digit number. The third is the multiplier. The fourth gives the tolerance around the nominal resistance.
Place the tolerance band, usually separated by a wider gap, on the right. The first digit cannot be black. A resistor without a tolerance band uses the 3-band code (±20%).
Example: brown – black – red – gold = 10 × 100 = 1 kΩ ±5%, or 950 to 1,050 Ω.
An encodable value is not necessarily available in a manufacturer’s catalog. These four bands do not specify power or voltage ratings.
Reference: Vishay resistor color code chart (PDF) ↗| Color | Digit | Multiplier | Tolerance |
|---|---|---|---|
| Black | 0 | ×1 | — |
| Brown | 1 | ×10 | ±1% |
| Red | 2 | ×100 | ±2% |
| Orange | 3 | ×1,000 | — |
| Yellow | 4 | ×10,000 | — |
| Green | 5 | ×100,000 | ±0.5% |
| Blue | 6 | ×1,000,000 | ±0.25% |
| Violet | 7 | ×10,000,000 | ±0.1% |
| Grey | 8 | ×100,000,000 | ±0.05% |
| White | 9 | ×1,000,000,000 | — |
| Gold | — | ×0.1 | ±5% |
| Silver | — | ×0.01 | ±10% |
Use the color calculator for axial resistors marked with four rings. The first two rings encode the significant digits, the third sets the multiplier and the last specifies tolerance. The result is a nominal resistance, not a measurement of the component.
| Band digits × multiplier | Nominal value | Tolerance |
|---|---|---|
| 10 × 100 Ω | 1 kΩ | ±5% |
| 47 × 100 Ω | 4.7 kΩ | ±5% |
| 22 × 10 Ω | 220 Ω | ±5% |
| 47 × 0.01 Ω | 0.47 Ω | ±1% |
Brown, black and red encode 10 × 100 Ω = 1 kΩ. A gold fourth band adds ±5% tolerance, giving a range from 950 to 1,050 Ω.
As multipliers, gold means ×0.1 and silver ×0.01. In the fourth position, gold means ±5% tolerance and silver ±10%.
No. This calculator uses two significant digits and four bands. A five-band resistor normally has three significant digits and needs a different interpretation.