A typical resistor for an electronic project has four color bands that specifies the value of the resistor. The right-most band is either gold or silver. Once you've identified the right side of the resistor, use the calculator below to determine the value of the resistor. Note that unless you've 20/20 vision, you'll need a magnifying glass and good lighting to see the color bands. In the calculator below, select the color of each band and the value of the resistor will be displayed. See the source of this HTML page, if you are curious how the color code is interpreted.