A 5-band resistor uses three significant digit bands, one multiplier band, and one tolerance band. This format is standard for high-precision (1% or 2%) through-hole components. To find your value, match the colors to the reference table below, or input them directly into a 5 band resistor colour code calculator. The direct answer for reading direction: always start from the band closest to the lead, leaving the wider-spaced tolerance band (usually gold, brown, or red) on the far right.
The 5-Band Resistor Colour Code Reference Table
Use this spec-sheet-table to decode your component. The first three bands form the base number, the fourth band tells you how many zeros to add (or decimal placement), and the fifth band dictates the manufacturing variance.
| Color | Band 1 (1st Digit) | Band 2 (2nd Digit) | Band 3 (3rd Digit) | Band 4 (Multiplier) | Band 5 (Tolerance) |
|---|---|---|---|---|---|
| Black | 0 | 0 | 0 | ×1 (10⁰) | — |
| Brown | 1 | 1 | 1 | ×10 (10¹) | ±1% (F) |
| Red | 2 | 2 | 2 | ×100 (10²) | ±2% (G) |
| Orange | 3 | 3 | 3 | ×1k (10³) | — |
| Yellow | 4 | 4 | 4 | ×10k (10⁴) | — |
| Green | 5 | 5 | 5 | ×100k (10⁵) | ±0.5% (D) |
| Blue | 6 | 6 | 6 | ×1M (10⁶) | ±0.25% (C) |
| Violet | 7 | 7 | 7 | ×10M (10⁷) | ±0.1% (B) |
| Grey | 8 | 8 | 8 | ×100M (10⁸) | ±0.05% (A) |
| White | 9 | 9 | 9 | ×1G (10⁹) | — |
| Gold | — | — | — | ×0.1 (10⁻¹) | ±5% (J) |
| Silver | — | — | — | ×0.01 (10⁻²) | ±10% (K) |
Standard Variants: IEC 60062 vs. SMD and MIL-SPEC
Unlike home wiring where you must navigate NEC (US), IEC (EU), and old UK color codes, resistor color bands are globally unified under the IEC 60062 standard. A 5-band resistor bought in Tokyo, Berlin, or Chicago will use the exact same color mapping. However, you will encounter variant standards based on component package and era:
- IEC 60062 (Standard Through-Hole): The 5-band system detailed above. Used for 1% and 2% tolerance axial leaded resistors. (Note: 6-band resistors add a 6th band for Temperature Coefficient, usually 100ppm/°C for brown or 50ppm/°C for red).
- EIA-96 (Surface Mount): High-precision SMD resistors (0603, 0805 packages) do not use color bands. They use a 3-character alphanumeric code (e.g., '01C' = 10kΩ). Never attempt to apply the 5-band color chart to SMD markings.
- MIL-PRF-55342 (Military SMD): Uses a 5-character alphanumeric code printed on the component body, entirely bypassing color bands for reliability in high-vibration environments.
- Old JIS (Japanese Industrial Standard): Pre-1990s Japanese equipment occasionally used a body-tip-dot system rather than painted bands. The body color was the first digit, the tip was the second, and the dot was the multiplier. This is obsolete but relevant when restoring vintage audio gear.
Rows and Bands People Get Wrong
Even experienced technicians misread bands under poor bench lighting. Here are the specific failure modes to watch for:
Red (2) vs. Orange (3)
Under warm LED or fluorescent bench lights, red and orange look nearly identical. The fix: Take the resistor to a neutral daylight window or use a 5000K daylight bench lamp. If the multiplier band is red, your value is in the hundreds; if orange, it is in the thousands. This single misread shifts your resistance by a factor of 10.
Gold (5%) vs. Yellow (4)
Beginners often confuse the gold tolerance band with a yellow digit band. The rule: Yellow is never used as a tolerance band on standard 5-band resistors. If the band on the far right looks yellowish-gold, it is Gold (±5%). Furthermore, on a true 1% 5-band resistor, the tolerance band will almost always be Brown (±1%), not Gold.
Reading Direction (The Gap Rule)
Reading right-to-left instead of left-to-right yields a completely wrong value. Look for the physical gap. Manufacturers print the first four bands tightly grouped, then leave a slightly wider gap before the final tolerance band. The tolerance band is also often centered slightly off-axis or printed thicker.
Decision Tree: Faded, Burnt, or Missing Markings
Color bands fade after decades of heat cycling, or a resistor burns black from an overcurrent event. Do not guess. Follow this decision path to terminate in a concrete action.
| Condition | Diagnostic Step | Concrete Action / Replacement Pick |
|---|---|---|
| Faded but colors visible | Measure in-circuit with a DMM. If reading is within 10% of your decoded value, the parallel circuit is skewing it slightly. | Trust the decoded value. No replacement needed. |
| Severely faded / Unreadable | Desolder one leg of the resistor to lift it from the PCB pads. Measure out-of-circuit. | If out-of-circuit reading is stable, keep it. If it fluctuates or reads Open (OL), replace with a Vishay MRS25 series 1% metal film of the measured value. |
| Burnt / Blackened body | Do NOT measure in-circuit. The carbon track is likely fractured. Desolder completely. | Discard immediately. Replace with a Vishay PR02 flameproof metal film (specifically rated for 2W and flame-retardant) to prevent future fire hazards. |
| Missing / Fallen off board | Trace the schematic or measure the voltage divider ratio on the PCB to calculate the required resistance. | Order a Yageo MFR-25 1% kit. Never substitute a wire jumper unless the schematic explicitly calls for a 0Ω jumper. |
Practical Calculation: Worked Example & Tool Usage
While a digital 5 band resistor colour code calculator is excellent for quick verification, you must understand the underlying math to catch input errors. Let us decode a physical resistor with the following bands: Brown, Black, Black, Red, Brown.
- Band 1 (Brown): 1
- Band 2 (Black): 0
- Band 3 (Black): 0
- Base Number: 100
- Band 4 (Red): Multiplier of ×100 (10²)
- Calculation: 100 × 100 = 10,000 Ω
- Band 5 (Brown): ±1% Tolerance
Final Value: 10kΩ with a 1% tolerance. This means the actual measured resistance on your bench will fall between 9,900 Ω and 10,100 Ω.
For a more complex example, consider Yellow, Violet, Black, Gold, Brown. The digits are 4, 7, 0 (Base: 470). The multiplier is Gold (×0.1). The calculation is 470 × 0.1 = 47 Ω. The brown band confirms it is a 1% precision resistor, likely used in a current-sense or audio feedback loop where exact values are critical.
When using an online or app-based 5 band resistor colour code calculator, always double-check the multiplier band. The most common calculator error occurs when users select 'Black' (×1) instead of 'Brown' (×10) for the multiplier, resulting in a value 10 times lower than reality. Always verify the calculator's output against the physical size of the resistor; a 1/4W axial resistor will not physically be 100kΩ if the calculator outputs 100Ω due to a multiplier typo. Trust the chart, verify with your meter, and build with confidence.
