This calculator converts resistor values to or from 5-band or 4-band colour codes.

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.