A handy tool for reading resistor color code values

4 strip Resistor

1st Digit
2nd Digit


5 strip Resistor

1st Digit
2nd Digit
3rd Digit


6 strip Resistor

1st Digit
2nd Digit
3rd Digit


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). 

  4-band 5-band 6-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

4th band tolerance multiplier multiplier
5th band N/A tolerance tolerance
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. 

Color Value

Black (2nd and 3rd bands only)

Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Grey 8
White 9


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.

Color Value


Brown x10
Red x100
Orange x1000
Yellow x10000
Green x100000
Blue x1000000
Violet x10000000
Grey x100000000
White x1000000000

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).

Color Value



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

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 Value


Brown 100 ppm/ºC
Red 50 ppm/ºC
Orange 15 ppm/ºC
Yellow 25 ppm/ºC
Green N/A
Blue 10 ppm/ºC
Violet 5 ppm/ºC
Grey N/A
White N/A


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).


Deviating Colors

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.


Reliability Band

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.

Further Reading

Textbook - Resistor: Ohm's Law

Textbook - Resistor Color Codes

Worksheet - Resistors

Understanding Electrical Resistance



  • ilane 2016-04-29

    Yep. Those were the days. I’ll never forget the basics of this. Some of the stuff, though, is esoteric as hell. Who’d make these days a ±0.05% tolerance resistor and mark it with color bands? Who has ever made one?

  • col_panek 2016-11-05

    Funny, I never heard that mnemonic, but something similar which I won’t repeat.

  • Eugene Edwards 2016-12-22

    I find this to be extremely helpful it’s about to save me $250.00 because now I can replace the resistor I fried on my electric board instead of buying a whole new board I’m so grateful to finally find a site that gives detailed information on electronics no one in this area wants to learn it so colleges have not had the class available thank you very much

  • Yahiko 2016-12-23

    I would like a version that I can have on my computer because I don’t always have a connection.

  • ray.leiter 2017-01-21

    Why would anyone go to the trouble of developing an application this useful and not provide a tolerance setting of 20%—it make NO sense!

    • Ricky Bennett 2018-06-12

      for the same reason they wont let you use black for the first band. as if that never happens lol. yes i know if its back then its a fuse or what not but not every knows that

  • Jari 2017-02-03

    Your calculator is not correct!
    0.1% qn 200K is not 220K is comes to 200.2K or 199.9L on the minus side.
    Hreetings John.

    • RK37 2017-02-03

      Hi Jari, I cannot quite understand your comment. Can you explain the problem in a different way?

      • iwasawizard 2017-02-22

        If you calculate a 200K resistor with a tolerance of 0.1%, the calculator will give a tolerance floor of 180K and a ceiling of 220K, which is correct for 10% tolerance, not 0.1%. The correct tolerance limits should be 199.8K - 200.2K.

  • Robert Keim 2017-02-23

    Ah, thanks for clarifying that, iwasawizard. We fixed it.

  • Jatrik Maity 2017-05-20

    how can I choose ist band inthe case 5 or 6 band

  • Jatrik Maity 2017-05-20

    How can I select 1st band among 5 bands

  • roper_ni 2017-08-09

    should make a downloadable version!

  • Shimmering Blaze 2017-09-01

    You have the violet tolerance color in your chart set to 0.15% but in the calculator it is set to 0.10%, which is correct?

  • Ajay Saraswati 2018-02-22

    can i download tools if yes then please guide

  • Wagner Silva 2018-10-10

    Some 5 strips resistor less than 1 ohms starts with a black strip. This calculator has not this option.