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Resistor Colour Code Calculator

This calculator converts resistor values to or from 5-band or 4-band colour codes. Details of the colour code system can be found here in the technical data section.

To convert from value to colours:

Select the resistor type (4 or 5 bands) using the radio buttons. Type the resistance in the box below and select the units and (optionally) the tolerance from the drop-down boxes. The colour bands will be displayed below on the image of the resistor.

To convert from colours to value:

Select the resistor type (4 or 5 bands) using the radio buttons. Hover the mouse over the coloured bands on the image of the resistor to display the colour selector box, then click on the required colour. Repeat for all bands (tolerance is optional). The resistance will be shown in the box above the image, along with the units and tolerance.

Preferred resistor values:

Converting a value either way will display the nearest preferred resistor value below the image of the resistor. Use the radio buttons below the image to select the series of preferred values to use (E12 - E192).

Select code type:

The colour code is:  
Select Value Series:
The nearest preferred resistor value is: Ohms

If you found this calulator useful you should try Electronics Assistant!

Electronics Assistant
  • All the online calculators and more in a stand-alone application
  • Converts Resistor & Inductor colour codes, calculates LED series resistors, capacitance units, series / parallel resistors & capacitors, frequency, reactance & more
  • Calculation of nearest preferred resistor values with a choice of 5 series from E12 to E192
  • Print & save calculation results
Band:
  • Black
  • Brown
  • Red
  • Orange
  • Yellow
  • Green
  • Blue
  • Violet
  • Grey
  • White
Multiplier:
  • Black
  • Brown
  • Red
  • Orange
  • Yellow
  • Green
  • Blue
  • Gold
  • Silver
Tolerance:
  • Brown
  • Red
  • Gold
  • Silver
  • None