Resistor Color Code Calculator
Decode resistor color bands to find the resistance value in ohms.
Supports both 4-band and 5-band resistors.
Resistance Value
Resistor Color Code is a system of colored bands painted on resistors to indicate their resistance value and tolerance.
4-Band Resistor:
Value = (Band1 × 10 + Band2) × Multiplier ± Tolerance
5-Band Resistor:
Value = (Band1 × 100 + Band2 × 10 + Band3) × Multiplier ± Tolerance
Color values:
- Black = 0, Brown = 1, Red = 2, Orange = 3, Yellow = 4
- Green = 5, Blue = 6, Violet = 7, Grey = 8, White = 9
Multiplier colors:
- Black = ×1, Brown = ×10, Red = ×100, Orange = ×1k, Yellow = ×10k
- Green = ×100k, Blue = ×1M, Violet = ×10M, Gold = ×0.1, Silver = ×0.01
Tolerance:
- Brown = ±1%, Red = ±2%, Green = ±0.5%, Blue = ±0.25%
- Violet = ±0.1%, Grey = ±0.05%, Gold = ±5%, Silver = ±10%