Every resistor has colored bands that encode its value. Master these and you can read any resistor at a glance — a core skill every electronics engineer needs.
Bands → Value
Select the color bands you see on a real resistor
220Ω
Tolerance ±5% → range: 209Ω – 231Ω
= (22) × 10 Ω
🔢 Value → Bands
Enter a resistance, see the color code
Red
digit 1
Red
digit 2
Brown
mult
Gold
tol
📊 Complete Color Band Reference
Color
Swatch
Digit
Multiplier
Tolerance
Black
0
×1
—
Brown
1
×10
±1%
Red
2
×100
±2%
Orange
3
×1,000
—
Yellow
4
×10,000
—
Green
5
×100,000
±0.5%
Blue
6
×1,000,000
±0.25%
Violet
7
×10,000,000
±0.1%
Grey
8
—
±0.05%
White
9
—
—
Gold
—
×0.1
±5%
Silver
—
×0.01
±10%
🧠 Memory tip — "BB ROY of Great Britain has Very Good Wife"
Black (0) Brown (1) Red (2) Orange (3) Yellow (4) Green (5) Blue (6) Violet (7) Grey (8) White (9)
Then Gold = ×0.1 (5% tol), Silver = ×0.01 (10% tol). The 4th band is always Gold or Silver on common resistors.