Math & Stats
Resistor Color Code Calculator
Calculate resistance and tolerance from 4-band resistor color codes.
FAQ
Frequently asked questions
What is a 4-band resistor?
A 4-band resistor uses 4 colored bands to indicate its resistance value and tolerance. The first two bands indicate the significant digits, the third indicates the multiplier, and the fourth indicates the tolerance.
How do I read the color code?
Read the bands from left to right, starting with the band closest to one end. The tolerance band is typically separated by a slightly larger gap.
What does gold or silver mean as a multiplier?
Gold as a multiplier means multiply by 0.1, and silver means multiply by 0.01.