# Resistor Color Code Calculator

Discussion in 'General Electronics Discussion' started by Ian, Mar 2, 2010.

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You can use this resistor color calculator to help you identify standard 4 band resistor values. The first 3 colors are used to indicate the resistance (in ohms) and the final band shows the resistor tolerance. If you wish to read more about how resistors work, please read this article to find out more.

Most resistors have 4 bands:
• The first band is the first digit of the resistance.
• The second band is the the second digit of the resistance.
• The third band indicates the number of zeros (the multiplier).
• The fourth band is used to shows the tolerance of the resistor (as a percentage).
Please use the dropdown boxes to select the colors on your resistor, then the resistance and tolerance values should be displayed in the boxes below:

[resistorcalc][/resistorcalc]

The Omega symbol (Ω) is used as the SI unit of electrical resistance and large vaules are often written in shorthand using K (for kilo, 1000) and M (for mega, 1000000). For example:
• 560Ω = 560 ohms
• 56KΩ = 56000 ohms = 56 kilohms
• 56MΩ = 56000000 ohms = 56 megohms

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Last edited: Mar 2, 2010