Calculators & Converters
    Resistor Color Code
    Color Band (A) :

    Color Band (B) :

    Color Band (C) :

    Tolerance :

    Color Code :





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    Decode Resistance Value - Resistor Color Code Calculator

    getcalc.com's Resistor Color Code Calculator is an online electrical engineering tool to calculate or decode resistance value based on the 4 color bands of resistors. Based on the composition of the material, the resistance value get changed largely. The below table of information shows the common materials and their corresponding resistance values used in the field of electrical & electronics engineering for various purposes. Any value of resistors can be represented by using this most reliable color coding method. Users may refer the below table to get familiar with the values of different colors used in the resistors and decode the actual resistor value by applying the values in the below formula.

    Common Materials & Resistance
    Material Resistance (Ω) Usage
    Silver 1.64 x 10-8 Conductor
    Copper 1.72 x 10-8 Conductor
    Gold 2.45 x 10-8 Conductor
    Aluminium 2.80 x 10-8 Conductor
    Carbon 4 x 10-5 Semi-conductor
    Germanium 47 x 10-2 Semi-conductor
    Silicon 6.40 x 102 Semi-conductor
    Paper 1010 Insulator
    Mica 5 x 1011 Insulator
    Glass 1012 Insulator
    Teflon 3 x 1012 Insulator

    To easily remember the color code values, memorize the below setence that is
    Black Brown ROY of Great Britain had a Very Good Wife who wore Gold and Silver Necklace“. Each marked alphabets & words in the sentence denotes the order of colors with their associated multiplier values. User may refer the below color band table & formula for more clarification.

    Definition & Formula

    Resistor Color Code is a popular technique used in electrical & electronic engineering to measure or decode the actual resistance value of a resistor in ohms, kilo-ohms, mega-ohms & giga-ohms. The 4 band color code is the most common & reliable color coding method to find the resistance value of a lead resistor. The A, B, C & Tolerance are the 4 color bands which represents the actual value of a resistor.

    Resistor color coding chart & formula
    Formula & chart to decode the resistance value by color code

    How to Decode Resistor Color Code?

    The below example may help users to know how to calculate or decode the resistance value by using the color code of a resistor.
    Example
    Find the resistivity of a resistor having the color bands A as Green, B as Violet, C as Blue and Tolerance as Silver.

    Solution
    step 1 Address the formula, input parameters & values
    Resistance Value (Ω) = AB x 10c ± Tolerance %
    Band A = Green = 5
    Band B = Violet = 7
    Band C = Blue = 6
    Tolerance = Silver = ± 10%

    step 2 Apply the corresponding values in the resistance color coding formula
    Resistance = 57 x 106 ± 10%
    = 57000000 ± 10%
    = 57 Mega ohm ± 10%

    Step 3 Find the Tolerance
    10% of 57 MΩ = (10/100) x 57000000
    Tolerance = 5.7 MΩ

    Step 4 Apply the tolerence in the formula
    Resistance = 57 MΩ + 5.7 MΩ
    = 62.7 MΩ
    Resistance = 57 MΩ - 5.7 MΩ
    = 51.3 MΩ

    Thus, the resistance value of resistor varies between 51.3 MΩ and 62.7 MΩ

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