Calculate the resistance of a 4 band resistor
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Resistance Calculator
4 Band Resistor
1st Digit
2nd Digit
Multiplier
Tolerance
Black
0
x1
Brown
1
1
x10
± 1%
Red
2
2
x100
± 2%
Orange
3
3
x1K
± 3%
Yellow
4
4
x10K
± 4%
Green
5
5
x100K
± 0.5%
Blue
6
6
x1M
± 0.25%
Violet
7
7
x10M
± 0.10%
Grey
8
8
x100M
± 0.05%
White
9
9
x1G
Gold
÷ 10
± 5%
Silver
÷ 100
± 10%
Outputs
Resistance:
5.60k ohms
Tolerance:
± 5%
Introduction
A resistor is a perhaps the most common building block used in circuits. Resistors come in many shapes and sizes this tool is used to decode information for color banded axial lead resistors.4 Band Description
The number of bands is important because the decoding changes based upon the number of color bands. There are three common types: 4 band, 5 band, and 6 band resistors. For the 4 band resistor:Band 1 – First significant digit.
Band 2 – Second significant digit
Band 3 – Multiplier
Band 4 – Tolerance
Resistance Value
The first 4 bands make up the resistance nominal value. The first 2 bands make up the significant digits where:black – 0
brown – 1
red – 2
orange – 3
yellow – 4
green – 5
blue – 6
violet – 7
grey – 8
white – 9
The 3rd band or multiplier band is color coded as follows:
black – x1
brown – x10
red – x100
orange – x1K
yellow – x10K
green – x100K
blue – x1M
violet – x10M
grey – x100M
white – x1G
gold – .1
silver – .01
An example of a resistance value is:
band 1 = orange = 3,
band 2 = yellow = 4,
band 3 = blue = 1M
value = 34*1M = 34 Mohm
Resistance Tolerance
The fourth band is the tolerance and represents the worst case variation one might expect from the nominal value. The color code for tolerance is as follows:brown – 1%
red – 2%
orange – 3%
yellow – 4%
green – .5%
blue – .25%
violet – .1%
gray – .05%
gold – 5%
silver – 10%
An example calculating the range of a resistor value is:
If the nominal value was 34 Ohm and the 4th band of the resistor was gold (5%) the value range would be nominal +/- 5% = 32.3 to 35.7
