Select bands to calculate resistance value.
Note: The tolerance band indicates how much the actual resistance may vary from the stated value.
Instantly decode resistor values using our 4-band color code calculator. Perfect for electronics hobbyists, engineers, and students alike.
Resistors are one of the most essential components in any electronic circuit. However, interpreting the colored bands on them can be tricky—especially for beginners. That’s where our 4-band resistor color code calculator comes in. Just select the colors you see on your resistor, and our tool will instantly show you its resistance value and tolerance.
A 4-band resistor uses four color bands to indicate its resistance value and tolerance. The first two bands represent the significant digits, the third band is the multiplier, and the fourth band represents the tolerance.
A resistor with color bands Red, Violet, Orange, Gold would be calculated as:
Our calculator instantly matches each selected color to its corresponding digit or multiplier value, in line with international standards (IEC 60062).
The fourth band indicates the possible variation in resistance, which is critical for circuit reliability.
As soon as you select the colors, the tool displays resistance in ohms (Ω), kilo-ohms (kΩ), or mega-ohms (MΩ), along with the tolerance range.
The calculator supports all standard resistor colors:
Our 4-band calculator is more than a tool—it’s a quick reference, a learning assistant, and a troubleshooting aid. Whether you're breadboarding a prototype or diagnosing a faulty circuit, it helps you work faster and smarter.
Don't let color bands slow you down. Use our 4-band resistor color code calculator to decode resistor values instantly and accurately. It’s reliable, easy to use, and always available—right when you need it.