Resistor Color Code Calculator
Quickly decode resistor values with our interactive calculator. Simply click the colors in the table to see the resistance, tolerance range, and real-time visual representation.
| Color | Band 1 | Band 2 | Band 3 (Mult) | Band 4 (Tol) |
|---|---|---|---|---|
| Black | — | 0 | x10⁰ | — |
| Brown | 1 | 1 | x10¹ | ±1% |
| Red | 2 | 2 | x10² | ±2% |
| Orange | 3 | 3 | x10³ | ±0.05% |
| Yellow | 4 | 4 | x10⁴ | ±0.02% |
| Green | 5 | 5 | x10⁵ | ±0.5% |
| Blue | 6 | 6 | x10⁶ | ±0.25% |
| Violet | 7 | 7 | x10⁷ | ±0.1% |
| Grey | 8 | 8 | x10⁸ | ±0.01% |
| White | 9 | 9 | x10⁹ | — |
| Gold | — | — | x10⁻¹ | ±5% |
| Silver | — | — | x10⁻² | ±10% |
About the Resistor Color Code Calculator
What is a Resistor Color Code?
Because resistors are often too small to have their values printed in text, manufacturers use a standardized system of colored bands to indicate their resistance (in Ohms), multiplier, and tolerance. This calculator follows the industry-standard EIA (Electronic Industries Alliance) color coding for 4-band resistors.
How to Use This Tool
- Band 1 & 2 (Significant Digits): These represent the first two numbers of the resistance value.
- Band 3 (Multiplier): This tells you how many zeros to add to the first two digits (or by what power of 10 to multiply).
- Band 4 (Tolerance): This indicates the precision of the resistor. For example, a ±10% tolerance means the actual resistance could be 10% higher or lower than the stated value.
- Results: The calculator automatically computes the Minimum and Maximum resistance values, helping you ensure your circuit remains within safe operating limits.
Why Accuracy Matters
In precision electronics, choosing the right resistor is critical. A high-tolerance resistor (like Gold ±5%) is preferred for timing and sensitive sensor circuits, while a Silver (±10%) or “none” (±20%) resistor is typically sufficient for basic pull-up or LED current-limiting tasks. Using this calculator helps prevent manual calculation errors that could lead to circuit failure or component damage.