Resistor Calculator

Select the color bands and the app returns the resistance value immediately - based on the industry-standard color code system. Over 1 million downloads!

Pick a resistor, set the color code, read the value. Supports 3, 4, 5, and 6 bands including tolerance and temperature coefficient - fast, precise, and offline.

• Makers and hobbyists working with Arduino or Raspberry Pi
• Electronics training, school, and university
• Engineers who need a quick reference on the go