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Resistor Color Code Calculator

How to use the calculator

To use this resistor calculator select the number of bands, the colors, the multiplier and the tolerance, the value will be displayed below:

Select the color of the bands:

First band


Second band


Multiplier(*)



Resistor Value:


Select the color of the bands:

First Band

First Band

Multiplier(*)

Tolerance



Resistor Value:


Select the color of the bands:

First Band
Second Band
Third Band
Multiplier(*)
Tolerance


Resistor Value:


Enter the resistor value


Select the number of tracks to display


Select units to convert


Select the Tolerance










How to calculate 3 band resistors

To calculate the value of a 3-band resistor, you need to know the colors of the three bands. The first band represents the first number, the second band represents the second number, and the third band represents the tolerance factor. Place the first and second numbers and multiply this value by the multiplication factor to get the resistor value.

Example: If the colors of a resistor are brown, purple, and red, that means the resistance value is 1.6 kiloohms.



How to calculate 4 band resistors

To calculate the value of a 4-band resistor, you need to know the colors of the four bands. The first band represents the first number, the second band represents the second number, the third band represents the third number, and the fourth band represents the tolerance factor.
Position the first and second and multiply this value by the multiplication factor to obtain the resistor value.

Example: If the colors of a resistor are brown, green, red and gold, it means that the resistance value is 1500 ohms, with a tolerance of ±5%.



How to calculate 5 band resistors

To calculate the value of a 5-band resistor, you need to know the colors of the five bands. The first band represents the first number, the second band represents the second number, the third band represents the third number, the fourth band represents the multiplication factor, and the fifth band represents the tolerance factor. Place the first, second and third number and multiply this value by the multiplication factor to get the final value of the resistor.

Example: If the colors of a resistor are green, blue, red, gray and gold, it means that the resistance value is 56.2 Gigaohms, with a tolerance of ±5%.< /p>

Be careful when calculating which resistor is ideal for your project

Proper resistor sizing is important to ensure proper circuit operation and to prevent damage to circuit components. If the resistor is not sized correctly, the current can increase, causing overheating or even fire. Also, if the resistor size is too large, it can cause a voltage drop and prevent the circuit from working properly. Therefore, it is essential to ensure that the resistors are sized correctly to ensure the safety and proper functioning of the circuit.


Observe the table with the representations of the colors of the resistors

Resistor Color Code Table
Color Band Multiplier Tolerance
1st 2nd 3rd
Black 0 0 0 x1 Ω (100) ± 1%
Brown 1 1 1 x10 Ω (101) ± 1%
Red 2 2 2 x100 Ω (102) ± 2%
Orange 3 3 3 x1K Ω (103)
Yellow 4 4 4 x10K Ω (104)
Green 5 5 5 x100K Ω (105) ± 0.5%
Blue 6 6 6 x1M Ω (106) ± 0.25%
Violet 7 7 7 x10M Ω (107) ± 0.1%
Gray 8 8 8 x100M Ω (108) ± 0.05%
White 9 9 9 x1G Ω (109)
Gold x0.1 Ω (10-1) ± 5%
Silver x0.01 Ω (10-2) ± 10%

Reinforce your knowledge with the video below

See also