Resistor 4-Band Color Code

Electronic engineers, hobbyists, and technicians identify axial resistor values using standard EIA-RS-279 color bands painted around the component body.

This calculator decodes 4-band resistors: Band 1 (first significant digit), Band 2 (second significant digit), Band 3 (multiplier 10ⁿ), and Band 4 (tolerance percentage like Gold ±5% or Silver ±10%), displaying standard and SI-prefixed values (kΩ, MΩ).

Resistance = (Digit₁ × 10 + Digit₂) × 10^(Multiplier). Tolerance Band defines acceptable tolerance window: Min = Resistance × (1 - Tol%), Max = Resistance × (1 + Tol%).