Resistor Color Code (4-band)
Decode 4-band resistors (two significant, multiplier, tolerance)
Resistor Color Code Calculator
Resistor color codes provide a simple and reliable way to represent resistance values without printing numbers on small components.
This Resistor Color Code Calculator decodes 4-band resistors accurately and quickly.
Understanding Resistor Color Codes
A 4-band resistor consists of:
1. First significant digit
2. Second significant digit
3. Multiplier
4. Tolerance
Each color corresponds to a numeric value.
How the Calculation Works
Resistance = (Band1 × 10 + Band2) × Multiplier
Tolerance indicates allowable variation in resistance.
Why Color Codes Are Used
• Compact design
• Durable markings
• Universal standard
• Easy visual identification
Common Mistakes
• Reading bands in reverse order
• Confusing multiplier and tolerance
• Ignoring tolerance range