# How to Calculate 4 Band Resistor Color Code? A Step-By-Step Guide

Have you ever encountered a resistor with multiple colored bands, but don’t know How to Calculate 4 Band Resistor Color Code? This guide is for you! Resistor color codes are important for anyone working with electronics since they represent the resistor’s resistance value. In this guide, we will discuss what resistor color codes are, why they are important, and provide a step-by-step guide so that you can quickly understand and calculate resistor color codes.

Resistor color codes are labels printed on resistors indicating their electrical properties such as resistance and tolerance values. Each color band on the resistor carries a specific meaning in regard to these electrical properties. By learning to read resistor colors correctly, we can determine the exact values of each resistance in an electronic circuit. Understanding these values is essential in helping us construct effective electronic circuits with accurate results.

This guide will explain the purpose of each colored band on a four-band resistor and demonstrate how to use them to calculate its resistance value and tolerance. We will also go over some tips and tricks for quickly interpreting resistor colors without having to do any calculations at all. By following this step-by-step guide, understanding how to read four-band resistors should become second nature.

## Understanding the Four Band Resistor Color Code

Before we dive into the specifics of how to calculate the resistor color code, let’s look at the history behind it. Resistor color codes have been around since the early 1900s when they were developed to help quickly identify resistance values in electronic circuits. The earliest designs only had three bands and eventually evolved into a four-band system which is still used today.

The four-band resistor color code consists of four colored stripes or bands that are printed on most resistors. Each band has a specific meaning in regard to its electrical properties, such as resistance and tolerance value. By learning to read resistor colors correctly, we can determine the exact values of each resistance in an electronic circuit.

The first three bands represent numerical values that indicate the resistor’s resistance value, while the fourth band provides information about tolerance. The tolerance indicates how much variation from its stated value should be expected from the actual measured value of the resistor. This can range from +-1%, +-2%, etc., depending on which color is used for this band.

Below is a breakdown of each color and what it stands for:

• Black – 0
• Brown – 1
• Red – 2
• Orange – 3
• Yellow – 4
• Green – 5
• Blue – 6
• Violet/Purple/Gray – 7 or 8 (depending on manufacturer)
• White – 9 (if applicable)

The fourth band can have one of several different colors, indicating its tolerance level: • Brown – +/- 1%

• Red – +/- 2%
• Gold – +/- 5%
• Silver – +/- 10%

## How to Calculate 4 Band Resistor Color Code?

Calculating a resistor’s value is simple and only requires a few steps. Here’s how:

Step 1: Identify the first band color – The first band on the resistor indicates its first digit. Refer to the list of colors above to determine which numerical value is represented by this band.

Step 2: Identify the second band color – The second band on the resistor indicates its second digit. Again, refer to the list of colors above to determine which numerical value is represented by this band.

Step 3: Identify the third band color – The third band on the resistor indicates its multiplier. This number can range from 0 up to 9 depending on its color. Refer to the list above for a detailed explanation of each color and its corresponding value.

Step 4: Determine the multiplier value – To calculate this, you need to find out what power of ten your number should be multiplied by based on your third-band color (or other symbols if applicable). For example, if your third-band color is orange (multiplier = 3), then you will multiply your two digits by 1000 (or 10^3).

Step 5: Calculate the resistor value – Now that you have all three values, you can add them together and get your total resistance in ohms (Ω). For example, if your first two bands are brown and red (1 & 2) and your third-band color is orange (multiplier = 3), then your total resistance would be 12 X 1000 or 12000 ohms.

Step 6: Determine the tolerance value – Lastly, identify what colour your fourth band is and use that colour’s associated tolerance level as an estimate of how close you can expect this resistor’s actual measured resistance to be compared with its stated resistance value.

## Examples

To help illustrate the resistor color code calculation, let’s look at three examples:

Example 1: Resistor with colors red, yellow, green, and gold – The first two bands indicate the numerical value (2 & 4), which when added together gives us 24. The third band indicates the multiplier which is 5 in this case. Our total resistance would be 24 X 10^5 or 2400000 ohms (2.4MΩ). The fourth band color is gold, so this resistor has a tolerance of +-5%.

Example 2: Resistor with colors brown, black, black, and silver – The first two bands indicate the numerical value (1 & 0), which when added together gives us 10. The third band indicates the multiplier which is 0 in this case. Our total resistance would be 10 X 10^0 or just 10 ohms (10Ω). The fourth band color is silver, so this resistor has a tolerance of +-10%.

Example 3: Resistor with colors orange, white, blue, and brown – The first two bands indicate the numerical value (3 & 9), which when added together gives us 39. The third band indicates the multiplier which is 6 in this case. Our total resistance would be 39 X 10^6 or 39000000 ohms (39MΩ). The fourth band color is brown so this resistor has a tolerance of +-1%.

## Conclusion

The resistor color code is a valuable tool for accurately calculating the value of a resistor. It is an essential component in many electrical and electronic circuits, so understanding this topic is essential for anyone working with these types of systems. In this article, we have gone over the steps for calculating a four-band resistor color code as well as some examples of how to do so. We have also highlighted the importance of accurate calculation of resistor values and provided additional resources to help further your knowledge in this area.

Here are some additional resources you can use to further your knowledge of resistor color codes:

## FAQs

### How do you calculate a 4 band color coded resistor?

The value of a 4-band colored resistor can be calculated using the following formula: Resistance = (First band x 10) + (Second band x multiplier) + (Third band). The first two bands on the resistor identify the digits and the third band indicates the multiplier.

### How do you calculate resistor color code?

The resistor color code is calculated by taking into account each of the four colored bands present on most resistors. The first two bands indicate the digits, while the third band indicates the multiplier and the fourth band indicates tolerance.

### What is the value of a 4 band resistor which?

To find out what value a 4-band resistor has, you must use its colored bands. The first two bands represent digits, while the third band indicates a multiplier in ohms and finally, there is a fourth that represents tolerance.

### How do you interpret the four Colour bands?

To interpret a 4-color resistor’s color bands, read each of them from left to right. The first two are digits and indicate whether they are in tens of thousands; then there is an additional multiplier (like 0.1 or 1000); lastly, there is an additional tolerance code that tells us how much our final result may vary.