 # How to calculate resistor color code pdf

Calculating the resistance value of a resistor using its color code may seem complicated at first, but with practice and an understanding of the color code chart, it becomes relatively easy. In this article, we will discuss how to calculate the resistance value  resistor color code of a resistor using its color code.

## The resistor color code chart is a tool that helps you

identify the resistance value of a resistor based on the colors of its bands. The chart consists of a list of colors and their corresponding digits and multipliers. The digits and multipliers are combined to form the resistance value of the resistor.

The color code chart for a 4-band resistor is as follows:

## Color | Digit Value | Multiplier | Tolerance

Black 0 1 ±20%

Brown 1 10 ±1%

Red 2 100 ±2%

Orange 3 1k ±3%

Yellow 4 10k ±4%

Green 5 100k ±0.5%

Blue 6 1M ±0.25%

Violet 7 10M ±0.1%

Gray 8 — ±0.05%

White 9 — ±10%

Gold — 0.1 ±5%

Silver — 0.01 ±10%

To calculate the resistance value of a 4-band resistor using its color code, follow these steps:

## Step 1: Identify the color of the first band.

The first band represents the first digit of the resistance value. Look up the color of the band on the color code chart and note down the corresponding digit value.

For example, if the first band is red, the digit value is 2.

## Step 2: Identify the color of the second band.

The second band represents the second digit of the resistance value. Look up the color of the band on the color code chart and note down the corresponding digit value.

For example, if the second band is green, the digit value is 5.

## Step 3: Identify the color of the third band.

The third band represents the multiplier of the resistance value. Look up the color of the band on the color code chart and note down the corresponding multiplier value.

For example, if the third band is brown, the multiplier value is 10.

## Step 4: Calculate the resistance value.

Combine the digit values from the first two bands and multiply them by the multiplier value from the third band.

For example, if the first band is red (digit value = 2), the second band is green (digit value = 5), and the third band is brown (multiplier value = 10), then the resistance value is:

Resistance value = (2 x 10) + 5 = 25

The units of the resistance value are in ohms, so the value of 25 ohms represents the resistance of the resistor.

## Step 5: Identify the tolerance value.

The fourth band represents the tolerance of the resistor. Look up the color of the band on the color code chart and note down the corresponding tolerance value.

For example, if the fourth band is gold, the tolerance value is ±5%.

## Final words

calculating the resistance value of a 4-band resistor using its color code requires an understanding of the color code chart and the ability to identify the Mad PCB   colors of the bands on the resistor. By following the steps outlined above, you can calculate the resistance value of a 4-band resistor with ease.