Resistance Value
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Resistors use a system of colored bands to indicate their resistance value, tolerance, and sometimes temperature coefficient. To read them, orient the resistor with the tolerance band (usually gold, silver, or a wider gap) to the right.
Resistor Color Code Chart
| Color | Digit | Multiplier | Tolerance | Temp. Coeff. (PPM/K) |
|---|---|---|---|---|
| Black | 0 | x1 Ω | - | 250 |
| Brown | 1 | x10 Ω | ±1% | 100 |
| Red | 2 | x100 Ω | ±2% | 50 |
| Orange | 3 | x1 kΩ | - | 15 |
| Yellow | 4 | x10 kΩ | - | 25 |
| Green | 5 | x100 kΩ | ±0.5% | 20 |
| Blue | 6 | x1 MΩ | ±0.25% | 10 |
| Violet | 7 | x10 MΩ | ±0.1% | 5 |
| Gray | 8 | x100 MΩ | ±0.05% | 1 |
| White | 9 | - | - | - |
| Gold | - | x0.1 Ω | ±5% | - |
| Silver | - | x0.01 Ω | ±10% | - |
Engineering checks for Resistor Color Code Calculator
Before using Resistor Color Code Calculator in a PCB, firmware, repair, or validation workflow, confirm the details that usually decide whether the design works reliably instead of only reading the headline specification.
Design and troubleshooting checklist
| Area | What to check | Why it matters |
|---|---|---|
| Formula inputs | Check the units, tolerance, and boundary values used by the resistor calculator color calculation | Wrong units or ideal assumptions can make a correct formula misleading |
| Circuit context | Compare the result with voltage, current, power, thermal, and safety limits on the PCB | Calculator output still needs board-level validation |
| Verification | Confirm the result with datasheet limits, simulation, or bench measurement before release | Measured behavior catches parasitics and loading effects |
These checks help connect the search intent around resistor calculator color with practical board-level decisions, component selection, and failure analysis.
