100 Ohm Resistor Color Code for 4-band

100 ohm resistor color code decoding method will explain in this article

Resistor color code

Resistor color coding is a method used to decode the resistance value of a fixed resistor, before that we need to know the colors and corresponding values.


 Colors and codes

Black – 0

Brown – 1

Red – 2

Orange – 3

Yellow – 4

Green – 5

Blue – 6

Violet – 7

Grey – 8

White – 9

Along with these 10 colors, Gold and silver represent tolerance band values.


How to identify first color band

 Start calculating color codes from left to right

The first color band is much closer towards the end of the resistor surface

The last color band is clearly separated from the rest of the color bands


Tolerance band

The Tolerance color band is the estimation of resistance value variation lower to higher, in other words, the tolerance band explains how much more or less a particular resistor varies from its actual resistance values.

Usually three values are used for this representation;

Gold -/+ 5%

Silver -/+ 10%

No color -/+ 20%

100 ohm resistor color code

1st color band – brown – 1

2nd color band – black – 0

3rd color band – brown – 1

4th color band – gold – +/-5%

100 Ohm Resistor Color Code for 4-band
100 Ohm Resistor Color Code for 4-band
















Decoding 100ohm resistor color code

When we start decoding resistor color code, the first two bands shows brown and black, it gives the values 1 and 0;

Then, the third color band brown, represent value 1, but 3rd band indicate multiplier 10^1,

This will give a value 100ohm, 4th tolerance band +/- 5% gold

 = 100ohm+/- 5%

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