A handy tool for reading resistor color code values
4 strip Resistor
5 strip Resistor
6 strip Resistor
How to Use the Resistor Color Code Calculator
Are you having trouble reading resistor color codes? If your answer is yes, then this tool is specifically designed for you! Our Resistor Color Code Calculator is a handy tool for reading carbon-composition resistors whether it's a 4-band, 5-band or 6-band type.
To use this tool, simply click on a particular color and number and watch how the actual bands on the resistor illustration change. The resistance value is displayed on the field below together with the tolerance and the temperature coefficient.
Resistor Band Colors
As shown above, a carbon-composition resistor can have 4 to 6 bands. A 5-band resistor is more precise compared to a 4-band type because of the inclusion of a third significant digit. A 6-band resistor is like a 5-band resistor but includes a temperature coefficient band (the 6th band).
|1st band||1st significant digit||1st significant digit||1st significant digit|
|2nd band||2nd significant digit||2nd significant digit||2nd significant digit|
|3rd band||multiplier||3rd significant digit||
3rd significant digit
|6th band||N/A||N/A||temperature coefficient|
Each color represents a number if it's located from the 1st to 2nd band for a 4-band type or 1st to 3rd band for a 5-band and 6-band type.
Black (2nd and 3rd bands only)
Mnemonics were created to easily memorize the sequence of the colors. The most popular mnemonic is "Big Boys Race Our Young Girls But Violet Generally Wins" where the first letter of each word corresponds to the first letter of the color.
If the color is found on the 3rd band for a 4-band type or the 4th band for a 5-band and 6-band type, then it's a multiplier.
Notice that the number of zeroes is equal to the color's number as per the previous table.
The fourth band (or 5th for the 5-band and 6-band) indicates the tolerance values. Here, two colors are added (gold and silver).
The 6th band for a 6-band type resistor is the temperature coefficient. This indicates how much the actual resistance value of the resistor changes when the temperature changes.
Color Code Exceptions
5 Band Resistor with a 4th Band of Gold or Silver
Five band resistors with a fourth band of silver or gold form an exception, and are utilized on specific or older resistors. The first two bands represent the significant digits, the third band is a multiplication factor, the fourth band is for tolerance and the fifth band is for the temperature coefficient (ppm/K).
In order to prevent metal and other particles from getting in the coating of high voltage resistors, the gold and silver bands are often replaced with a yellow and gray band.
Single Black Band or Zero-Ohm Resistor
A single black band on a resistor is called a zero-ohm resistor. Basically, it is a wire link used to connect traces on a printed circuit board (PCB) that is packaged in the same physical package format as a resistor. This packaging allows the zero-ohm resistor to be placed on the circuit board using the same equipment typically used to place other resistors.
When resistors are produced in accordance to military specifications, they will often include a band that indicates reliability. This band is specifically for failure rate percentage per 1000 hours of service. This band is almost never used in commercial electronics. Four band resistors typically use this reliability band. For more information about this can be found in the US military handbook MIL-HDBK-199.