Decode any 4-band resistor color code to its resistance value and tolerance range — the essential tool for anyone working with electronics.
How it works
- Select the color for the first band (first digit).
- Select the color for the second band (second digit).
- Select the color for the multiplier band and tolerance band to receive the final resistance.
Frequently asked questions
How do I read the bands?
Hold the resistor with the tolerance band (gold/silver) on the right. Read left to right: two digits, multiplier, tolerance.
What if there is no 4th band?
A resistor with no tolerance band is assumed ±20% — only found in older components.
What is a 5-band resistor?
High-precision resistors add a third digit band before the multiplier. This calculator covers the common 4-band type.