Resistor Color Code Calculator

The electronic color code was established to make it easier to recognize the values of resistors and other components. Our free resistor color code calculator makes it even simpler. This versatile tool not only allows users to determine the value of a resistor based on the color code but also find the color codes for a 4 and 5 band resistor.

How to calculate the color code

Begin by selecting your resistor type; either a 4 or 5 band resistor. Next, you will be asked to enter the resistance and units (e.g. 10 Ohm, 1 kOhm, 5 MOhm, 1 GOhm). Finally, you will select the appropriate tolerance from the drop-down list. Once you have inputted all of the required information, the calculator will display the correct color code.

How to calculate the value

Select the correct resistor type. Then, click on the color bands that are found on the resistor image. When you see the color selector box, click on the appropriate color bands. Once you have completed all of these steps, the calculator will display the resistor's resistance, units, and tolerance. Please note that the displayed value will always be the nearest preferred resistor value of the "E" series.

Resistor Color Code Calculator
Number of Bands:



Will this calculator work for 3-band resistors?

Yes. Select the 4-band resistor type and don't enter anything in the field designated for the 4th band. A 3-band resistor has no tolerance band, which means they have a value of tolerance of 20%.

How can I use this calculator to find the value of a 6-band resistor?

Although this calculator is designed to return values and color codes for 4 to 5-band resistors, it also works for 6-band resistors. All you need to do is enter the first five colors. The extra band is used to indicate either the reliability or the temperature coefficient of the 6-band resistor.

SMD Resistor Calculator

The SMD Resistor Calculator is a fast and easy way to find the value of SMD (surface mount device) resistors. All you have to do is enter the 3-digit code (standard tolerance) or 4-digit code (precision surface mount) that is found on the resistor, and the calculator will automatically display the resistance value.

SMD Resistor Calculator
Type in the SMD resistor code:
Calculated Resistance Value: 1kΩ

You may also be interested in our Voltage Divider Calculator or Sig Fig Calculator

Rating: 4.4/5 (304 votes)