Resistor Color Code Calculator
Decode resistor color bands into ohms, or enter a resistance to find the matching bands.
Bands → Value
Resistance
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Tolerance range
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Value → Bands
That value can't be represented exactly with standard color bands. Try a value closer to a round number, like 4.7kΩ or 220Ω.
4-band:
5-band:
How Resistor Color Codes Work
Most resistors use colored bands instead of printed numbers to show their value. On a standard 4-band resistor, the first two bands are significant digits, the third is a multiplier (how many zeros to add), and the fourth is the tolerance. 5-band resistors add a third digit for extra precision. Read the full breakdown in What Is a Resistor?
Want to size a resistor for an LED instead? Try the LED Resistor Calculator, or check the underlying formula in our Ohm's Law tutorial.