About this tool: Resistor Color Code
Decode a four- or five-band resistor and calculate its nominal resistance and tolerance range.
Read the resistor from the end nearest the first digit band. Four-band resistors use two significant digits; five-band resistors use three. The multiplier scales these digits, and the final band specifies the permitted variation around the nominal resistance.
How the calculation works
Worked example
| Number of bands | 4 |
| First band | Yellow |
| Second band | Violet |
| Third band | Black |
| Multiplier | Red |
| Tolerance | Gold |
R = 4700 Ω; ±5%; 4465–4935 Ω
Questions and answers
What does this tool do?
Decode a four- or five-band resistor and calculate its nominal resistance and tolerance range. Read the resistor from the end nearest the first digit band. Four-band resistors use two significant digits; five-band resistors use three. The multiplier scales these digits, and the final band specifies the permitted variation around the nominal resistance.
What affects precision and input format?
Text operations depend on the selected format. Check the supported characters and syntax in the description and example.
Where are the calculations performed?
The calculation runs in your browser. You can use the tool without installing software.
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