Resistor Color Code Calculator


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 and 5-band. 

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. 

 4-band5-band6-band
1st band1st significant digit1st significant digit1st significant digit
2nd band2nd significant digit2nd significant digit2nd significant digit
3rd bandmultiplier3rd significant digit3rd significant digit
4th bandtolerancemultipliermultiplier
5th bandN/Atolerancetolerance
6th bandN/AN/Atemperature 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. 

ColorValue
Black (2nd and 3rd bands only)0
Brown1
Red2
Orange3
Yellow4
Green5
Blue6
Violet7
Grey8
White9

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 type, then it’s a multiplier.

ColorValue
Blackx1
Brownx10
Redx100
Orangex1000
Yellowx10000
Greenx100000
Bluex1000000
Violetx10000000
Greyx100000000
Whitex1000000000

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).

ColorValue
BlackN/A
Brown±1%
Red±2%
Orange±3%
Yellow±4%
Green±0.5%
Blue±0.25%
Violet±0.10%
Grey±0.05%
WhiteN/A
Gold±5%
Silver±10%
0