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In modern electronics, color coding remains the only visual way to identify a component's value, not counting, of course, physical measurement with a multimeter. Need an accurate resistor color code calculator? The online tool on this page will help you solve this task in a couple of seconds, working flawlessly in both directions: from color to resistance and from resistance back to color bands.
How to use our calculator
Our widget is a powerful tool that operates in two modes:
- Find the value: Use our resistor color code calculator to determine the resistance of a part. Simply select the band colors in the widget according to their arrangement on the component's body, and you will get the exact value.
- Find the color bands: Enter the required resistance into the calculator, and the system will show you exactly what your component with colored rings should look like.
Our tool supports both the standard 4-band (E24 series) and the precision 5-band (E96 series) standards, making it indispensable when designing high-accuracy circuits. It simplifies the task and saves time! We highly recommend bookmarking it.
How to read the chart
To make working with components easier, we have prepared the reference table that our algorithm relies on. If you want to know how to read resistor bands manually, use this guide:
| 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% |
| Gold | - | 0.1 | ±5% |
| Silver | - | 0.01 | ±10% |
Step-by-step reading guide:
- Find the starting point: Locate the band placed closest to the edge of the body. This represents the first significant digit.
- Second digit: The band following it is the second digit of the value.
- Third digit (for 5 bands only): If you have a precision 5-band resistor, the third band represents the third significant digit.
- Multiplier: The second-to-last band indicates the multiplier (what you multiply the base number by).
- Tolerance: The very last band (which often has a slight gap from the rest) shows the accuracy class or tolerance.
Here is an example of a classic resistor color chart:
Why is color coding better than printed text?
Historically, alphanumeric printing was widely used, but it had a major drawback: the text was often facing down towards the PCB or covered in flux/lacquer after soldering. Even worse, if a resistor burned out and blackened, it couldn't even be checked with a multimeter (due to an open circuit).
Modern color coding is a ring standard (EIA-RS-279). The paint is applied around the entire cylindrical body, meaning the value can be read from any angle of rotation on the board, and in almost any condition. This speeds up electronics assembly and repair significantly. While experienced technicians often memorize the colors, we created this convenient calculator for everyone else.
Don't forget to rate our widget using the rating system below, thank you!