Resistor Color Code Calculator
Use color bands to calculate resistance, or reverse-find color bands from a resistance value.
Calculating...
Frequently Asked Questions
Each color band represents a digit or multiplier. The first 2-3 bands are significant digits, the next is the multiplier, and the last is the tolerance. For example, Brown-Black-Red-Gold means 1-0 x 100 = 1KΩ ±5%.
4-band resistors have 2 significant digits, a multiplier, and tolerance. 5-band resistors add a third significant digit for greater precision, commonly used in precision circuits.
The tolerance band indicates how much the actual resistance can vary from the stated value. Gold means ±5%, Silver means ±10%, and Brown means ±1%.
Yes. Our tool supports reverse lookup — enter any resistance value in ohms, kilohms, or megaohms, and it will show you the corresponding color band combination.
Yes. Gopafy's Resistor Calculator is completely free with no sign-up required and unlimited usage.
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