Formula
Significant colour digits are multiplied by the multiplier band; tolerance defines the permitted resistance range.
ELECTRONICS
Resistor Color Code Calculator
Decode 4-, 5- or 6-band resistors with tolerance and temperature coefficient.
CALCULATOR GUIDE
How to use the Resistor Color Code Calculator
Decode four-, five- or six-band resistor colours into resistance, tolerance and temperature coefficient.
Worked example
Brown-black-red-gold represents 1,000 Ω, or 1 kΩ, with ±5% tolerance.
Assumptions and limits
Band orientation matters. Confirm safety-critical or ambiguous components with a calibrated multimeter.
Frequently asked questions
Which end of a resistor should I read first?
Start opposite the tolerance band, which is often gold, silver or spaced farther from the other bands.
What does tolerance mean?
Tolerance is the permitted percentage difference between nominal and actual resistance.
How this calculator works
Enter your known values and select Calculate result. Review units and inputs before relying on the planning estimate.
Actual quantities, prices and requirements can vary. Confirm critical work with a supplier or qualified professional.