Resistor Code Calculator

A resistor code calculator that decodes color bands in seconds, giving makers, hobbyists, and electronics professionals instant access to resistance values without manual calculation or lookup tables.

Whether you're prototyping on Arduino, configuring Raspberry Pi circuits, breadboarding new designs, or repairing electronics, this app eliminates guesswork and saves time on every project. Simply tap the color rings corresponding to your resistor's bands, and the app instantly displays the resistance value in ohms along with tolerance specifications.

Designed for anyone working with electronics—from students encountering resistor color codes for the first time to seasoned technicians and engineers—the calculator supports both 4-band and 5-band resistor formats. It follows the industry-standard EIA color code, ensuring accuracy across all your builds and repairs.

The clean, distraction-free interface keeps you focused on your work. With offline functionality, you can reference color codes anywhere—in your workshop, at the bench, or in the field—without needing an internet connection. No ads, no unnecessary features, just a reliable tool that works when you need it.

Whether you're building a new circuit, debugging a project malfunction, or studying for an electronics exam, the Resistor Code Calculator makes identifying component values effortless. Keep a complete color code reference in your pocket and work faster and more confidently on every project.