Read the value of any through-hole resistor by selecting its colored bands. This calculator supports 4, 5 and 6 band resistors and converts the colors into a resistance in ohms plus a tolerance and, on 6 band parts, a temperature coefficient. The bands encode digits, a multiplier and a tolerance using the standard electronic color code where black is zero, brown is one, red is two and so on up to white for nine. Working the code out by eye is error prone, especially with gold and silver multipliers or tightly spaced bands, so a quick lookup saves time and prevents mistakes when you are stuffing a board or checking a salvaged part. Choose your band count, set each color, and the resistance updates instantly in your browser.
The first bands give significant digits, the next band is a multiplier, and later bands give tolerance and temperature coefficient. This calculator combines them into the final ohm value.
A 4 band resistor has two digit bands, a multiplier, and a tolerance band. A 5 band adds a third digit band, and a 6 band adds a temperature coefficient band.
Tolerance is the allowed percentage the real resistance can deviate from the coded value, for example a gold band means plus or minus 5 percent.
Read the value of any through-hole resistor by selecting its colored bands. This calculator supports 4, 5 and 6 band resistors and converts the colors into a resistance in ohms plus a tolerance and, on 6 band parts, a temperature coefficient.
Yes. Resistor Color Code Calculator is completely free, with no sign-up and no usage limits.
Yes. Resistor Color Code Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Resistor Color Code Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.