Resistor Color CodeCalculator
Decode 4-band, 5-band, and 6-band resistor color rings into exact resistance values, tolerance ranges, and temperature coefficients.
Color Band Configuration
Decoded Resistance
Resistor Color Code Calculator - Free 4-Band, 5-Band & 6-Band Decoder: Decode 4-band, 5-band, and 6-band axial resistor color bands into resistance, tolerance, and PPM. Fast, free, and secure client-side execution in your browser.
How to Use the Resistor Color Code Calculator
Select Resistor Band Count
Choose between standard 4-band, precision 5-band, or military/aerospace 6-band resistors.
Select Ring Colors
Pick colors matching the painted rings on the physical cylindrical through-hole resistor body.
Read Resistance in Ω / kΩ / MΩ
Instantly view nominal resistance with automatic SI prefix metric formatting.
Inspect Tolerance Boundaries
Review exact manufacturing tolerance boundaries (minimum and maximum acceptable Ohms).
Deciphering Resistor Color Codes: EIA-RS-279 Standards and E-Series Values
Through-hole axial-lead resistors are universally identified by painted colored rings based on the international Electronic Industries Alliance standard EIA-RS-279. Because miniature cylindrical resistors are too small for readable alphanumeric text stamping, color coding enables electronic technicians, hobbyists, and circuit board assembly operators to rapidly identify component resistance, manufacturing tolerance, and temperature stability.
The 4-band resistor represents the traditional consumer electronics baseline. The first two bands denote significant digits (0 through 9), the third band represents the decimal multiplier (powers of 10), and the fourth band designates manufacturing tolerance (typically gold for ±5% or silver for ±10%). For example, Yellow-Violet-Orange-Gold translates directly to 4-7 with a 1,000 multiplier (47,000 Ω or 47 kΩ) ±5%.
Modern high-precision metal film resistors employ 5-band and 6-band formats. In a 5-band resistor, three significant digit rings provide three-digit resolution, followed by a multiplier ring and a narrow tolerance band (often brown for ±1% or red for ±2%). In a 6-band resistor, a final sixth ring indicates the Temperature Coefficient of Resistance (TCR) expressed in parts per million per Kelvin (ppm/K), indicating how resistance drifts as the component warms.
Commercial resistors are manufactured strictly in standardized preferred values known as the E-series (E12, E24, E96, and E192). Established by the International Electrotechnical Commission (IEC 60063), each series establishes logarithmic spacing between adjacent values, ensuring that the component's manufacturing tolerance neatly covers the mathematical gap to the next available resistor value without overlap.
Key Advantages & Analytical Value
4, 5 & 6-Band Versatility
Decodes every standard through-hole axial resistor encountered in electronics engineering.
Smart Prefix Formatting
Automatically formats values into clean Ohms (Ω), kilo-Ohms (kΩ), and mega-Ohms (MΩ).
Tolerance Boundary Bounds
Calculates exact physical component resistance min/max inspection limits.
Tempco ppm/K Tracking
Supports 6th-band temperature coefficient of resistance for precision instrumentation.
100% Client-Side Privacy
Decode proprietary hardware schematics and PCB designs safely in browser memory.
Zero Friction
Immediate recalculations on every color dropdown selection.
Frequently Asked Questions
Hold the resistor with the tolerance band (gold or silver, or the band with a larger space) on the right. Read bands from left to right: significant digits, multiplier, and tolerance.
A popular mnemonic is "Bad Beer Rots Our Young Guts But Vodka Goes Well" representing Black (0), Brown (1), Red (2), Orange (3), Yellow (4), Green (5), Blue (6), Violet (7), Gray (8), White (9).
A 4-band resistor has 2 significant digits and 1 multiplier, typically used for ±5% tolerance. A 5-band resistor has 3 significant digits, providing higher precision (typically ±1% or ±2%).
A gold multiplier band means multiply by 0.1, while a silver multiplier means multiply by 0.01, allowing fractional sub-Ohm values.
Ppm/K stands for parts per million per Kelvin, measuring how many micro-ohms the resistance will change per Ohm for each degree Celsius/Kelvin shift in temperature.