4 Band Resistor Color Code Calculator
Decode 4-band resistor colors into resistance value and tolerance.
Inputs
Result
Example Inputs: Yellow, Violet, Red, Gold
Example Output: 4.7 kOhms +/-5%
Live Result: Enter values and click Calculate.
Formula
Value = (Band1 digit * 10 + Band2 digit) * multiplier; Band4 sets tolerance.
Worked Example
Use the example inputs and outputs above to walk through the calculation step-by-step.
FAQ
How is resistance calculated?
Band 1 and Band 2 are significant digits, Band 3 is the multiplier, and Band 4 is tolerance.
Why is black not available for Band 1?
A 4-band resistor cannot start with 0 as the first significant digit.
What does tolerance mean?
Tolerance indicates possible variation around the nominal resistance value.
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Formula Notes
Band 1 and 2 define significant digits, Band 3 is multiplier, Band 4 is tolerance.
Worked Example
Yellow(4), Violet(7), Red(x100), Gold(+/-5%) gives 4700 ohms +/-5%.