3-Band Resistor Color Code to Value Calculator

Using this 3-Band Resistor Color Code to Value Calculator you can calculate the value of any resistor that has three color codes. You can calculate resistance values in Ohm, KiloOhm, MegaOhm, and even in GigaOhm also.

3-Band Color Code Resistor Value Calculator

Band 1: Select color Black Brown Red Orange Yellow Green Blue Violet Gray White
Band 2: Select color Black Brown Red Orange Yellow Green Blue Violet Gray White
Band 3: Select color Black Brown Red Orange Yellow Green Blue Violet Gray White Gold Silver

Resistance Value:

How to Use this calculator?

1. First of all, Identify the three color bands on your resistor.
2. For each band, select the corresponding color from the drop-down menu in the calculator.
3. Band 1: Choose the color of the first band from the "Band 1" drop-down menu.
4. Band 2: Choose the color of the second band from the "Band 2" drop-down menu.
5. Band 3: Choose the color of the third band from the "Band 3" drop-down menu.
6. Once you have selected the colors for all three bands, click on the "Calculate" button.
7. The calculator will process your input and display the calculated resistance value.
8. Look for the "Resistance Value" section below the calculator interface.
9. The calculated resistance value will be shown in different units in the result section.

Formula

Here are the formulas, this calculator uses to find out the resistance values,

Resistance = (Band1Value * 10 + Band2Value) * 10^Band3Value

Here is the explanation of each component of the formula:

Band1Value: This represents the value of the first color band. Each color corresponds to a specific numerical value (0 to 9). For example, Black = 0, Brown = 1, etc.

Band2Value: This represents the value of the second color band. Like Band1Value, each color corresponds to a specific numerical value (0 to 9).

Band3Value: This represents the multiplier value indicated by the color of the third band. It determines the order of magnitude for the resistance value. The colors Gold (10^-1) and Silver (10^-2) are also included which are used for small-value resistors.

You can see here "10" is used. This is the base value used to calculate the resistance. Each digit in the first and second bands represents a factor of 10.

The value of Band 3 is used like this - 10^Band3Value: This is the multiplier applied to the combined value of Band1Value and Band2Value that is determined by the color of the third band. It represents the order of magnitude by which the resistance should be multiplied.

Example

Now, Let's take an example to calculate the resistance value of a three-band resistor using the color code.

Assuming we have a resistor with the following colors:

Band 1 or Color 1: Red

Band 2 or Color 2: Violet

Band 3 or Color 3: Green

We know that Red (value = 2), Violet (value = 7), Green (multiplier = 5)

Using the formula mentioned earlier:

Resistance = (Band1Value * 10 + Band2Value) * 10^Band3Value

So, Resistance = (2 * 10 + 7) * 10^5

Resistance = (20 + 7) * 10^5

Resistance = 27 * 10^5

Resistance = 27,000,000 Ω (Ohms)

So, in this example, the calculated resistance value for the given three-band resistor is 27,000,000 Ohms or 27 Megaohms.

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