Resistor color code calculator help

Get started with the basics or learn all its advanced tricks

From resistance value to color code

To find out which is the color code of a resistor from the value of resistance simply type in the desired value (eg 120 ohm) and press Enter or click the Go button. A stylized image of a resistor with the required color code will automatically appear.

In cases where the required value is not a IEC-60063 standard, the two standard resistors closest to excess or defect will be suggested (eg 400 Ω).

In addition to the resistance, you can specify the tolerance, which must be followed by the percent sign "%" and the temperature coefficient, which must be followed by the unit of measure "ppm / K" (eg 5.23Ω 1%, 31.6Ω 2% 20ppm/K, etc.).

The resistance can be inserted either as a pure number (eg 470), or followed by the unit of measure, "ohm" or "Ω" (eg 8.2kΩ).
In both cases you can use some prefixes of the International System, in particular "k" and "K" to indicate a multiplication factor of a thousand and "M" to indicate a multiplication factor of one million (eg 1k ohm, 22MΩ, etc.) .

From color code to resistance value

To find out which is the nominal resistance of a resistor just type in the sequence of colors separated by a space or hyphen (-). The colors should be written in English and not case-sensitive.
Available colors are the following: Black-Brown-Red-Orange-Yellow-Green-Blue-Violet-Grey-White-Silver-Gold

To help you enter the sequence of colors a color selection bar has been provided. Using it, you can easily add the colors simply by clicking on the colored squares.
By clicking, for example, in sequence on the brown, black, red and gold boxes, the "Brown-Black-Red-Gold" string is generated, and as can be easily verified, it corresponds to a resistor of 1kΩ, 5%.