Resistor Color Code Calculator

Resistors use colored bands to indicate their resistance value and tolerance. Here's a guide to decode them:

4-Band Resistor Color Code Table

Color	1st Digit	2nd Digit	Multiplier	Tolerance
Black	0	0	1Ω	-
Brown	1	1	10Ω	±1%
Red	2	2	100Ω	±2%
Orange	3	3	1kΩ	-
Yellow	4	4	10kΩ	-
Green	5	5	100kΩ	±0.5%
Blue	6	6	1MΩ	±0.25%
Violet	7	7	10MΩ	±0.1%
Grey	8	8	100MΩ	±0.05%
White	9	9	1GΩ	-
Gold	-	-	0.1Ω	±5%
Silver	-	-	0.01Ω	±10%

How to Use the Table

Example: A resistor with bands [Yellow, Violet, Red, Gold]:

1. Yellow (1st digit) = 4
2. Violet (2nd digit) = 7
3. Red (Multiplier) = 100Ω
4. Gold (Tolerance) = ±5%

Calculation: 47 × 100Ω = 4700Ω (4.7kΩ) ±5%

Notes

• 5-band resistors include a third digit and higher precision.
• Military-spec resistors may use additional colors for tolerance.