The color code of resistance bands is a visual shorthand defined globally by the IEC 60062 standard to indicate a resistor's ohmic value, tolerance, and temperature coefficient. Unlike mains wiring, this standard does not change by region. A 4.7kΩ resistor reads the same in Tokyo, London, and New York. Below is the complete reference chart, followed by bench-tested advice for reading faded components and avoiding common visual traps.
The Universal Resistance Band Reference Table
Read the table below to decode any standard axial resistor. The columns represent the physical bands painted on the component body, from left to right.
| Color | Band 1 (Digit) | Band 2 (Digit) | Band 3 (5-Band Digit) | Multiplier | Tolerance | Temp Coeff (ppm/°C) |
|---|---|---|---|---|---|---|
| Black | 0 | 0 | 0 | ×1Ω | — | 250 |
| Brown | 1 | 1 | 1 | ×10Ω | ±1% | 100 |
| Red | 2 | 2 | 2 | ×100Ω | ±2% | 50 |
| Orange | 3 | 3 | 3 | ×1kΩ | — | 15 |
| Yellow | 4 | 4 | 4 | ×10kΩ | — | 25 |
| Green | 5 | 5 | 5 | ×100kΩ | ±0.5% | — |
| Blue | 6 | 6 | 6 | ×1MΩ | ±0.25% | 10 |
| Violet | 7 | 7 | 7 | ×10MΩ | ±0.1% | 5 |
| Gray | 8 | 8 | 8 | ×100MΩ | ±0.05% | — |
| White | 9 | 9 | 9 | ×1GΩ | — | — |
| Gold | — | — | — | ×0.1Ω | ±5% | — |
| Silver | — | — | — | ×0.01Ω | ±10% | — |
Worked Example (5-Band): You have a resistor with Yellow, Violet, Black, Red, and Brown bands.
1. Yellow (4), Violet (7), Black (0) = 470.
2. Red multiplier = ×100.
3. 470 × 100 = 47,000Ω (47kΩ).
4. Brown tolerance = ±1%. The actual value will fall between 46.53kΩ and 47.47kΩ.
Standard Variants: IEC 60062 vs Regional Wire Codes
Beginners often conflate component markings with mains wiring standards, leading to dangerous assumptions. It is critical to understand that while household wire insulation colors vary wildly by region, the color code of resistance bands does not.
The only 'variants' you will encounter on the bench are the physical band counts, which dictate the precision of the component:
- 4-Band Standard: Two significant digits, one multiplier, one tolerance. Typical for 5% carbon film resistors.
- 5-Band Precision: Three significant digits, one multiplier, one tolerance. Standard for 1% metal film resistors (e.g., Vishay MRS25 series).
- 6-Band High-Reliability: Adds a sixth band indicating the Temperature Coefficient (ppm/°C), crucial for precision analog circuits and audio crossovers where heat drift alters circuit behavior.
Rows People Get Wrong and Faded Marking Fixes
Even experienced engineers misread bands under poor lighting. Here are the most common visual traps and how to resolve them.
1. Red vs. Orange Under Warm Lighting
Under 2700K warm bench LEDs or incandescent bulbs, an orange band (3) will frequently look red (2). This turns a 3.3kΩ resistor into a 2.2kΩ resistor in your mind, completely throwing off bias networks. The Fix: Always inspect resistors under 5000K daylight-balanced LEDs or hold them to a window. If using a smartphone camera, turn off the flash and rely on ambient daylight.
2. Brown vs. Black vs. Red
Dark brown (1) can easily be mistaken for black (0) if the epoxy coating is thick, or mistaken for red (2) if the lighting is dim. The Fix: Compare the suspect band to the other bands on the same resistor. If the first band is brown and the third band is red, the contrast will reveal the true colors.
3. Gold Tolerance vs. Yellow Multiplier
A gold band (±5% tolerance) and a yellow band (×10k multiplier) can look similar at a glance. The Fix: Look at the sheen. Gold has a distinct metallic, reflective sparkle. Yellow is flat and matte. Furthermore, gold is almost always the final band on the right side of the component.
Safe Interpretation of Faded or Burnt Markings
When a resistor overheats, the epoxy body darkens and the paint blisters, obliterating the color code of resistance bands. Never guess the value based on the schematic. The physical component may have drifted wildly from its nominal value due to thermal stress.
- Desolder at least one leg of the resistor from the PCB. Measuring in-circuit will yield a falsely low reading due to parallel current paths through other components.
- Set your digital multimeter (e.g., a Fluke 87V) to the appropriate ohms range.
- Measure across the leads. If the reading is 'OL' (open loop) or significantly higher than the schematic value, the carbon track has fractured internally and the part must be replaced.
Frequently Asked Questions
What is the color code of resistance bands for a 10k ohm resistor?
For a standard 4-band 10kΩ resistor (5% tolerance), the bands are Brown (1), Black (0), Orange (×1k), and Gold (±5%).
If you are using a precision 5-band 10kΩ resistor (1% tolerance), the bands are Brown (1), Black (0), Black (0), Red (×100), and Brown (±1%). Always verify which physical variant you are holding before soldering.
Which way do I read the color code of resistance bands?
Always read from left to right, starting with the bands grouped closest to one lead. The key is to locate the tolerance band first. On 95% of resistors, this is a Gold or Silver band, which is spaced slightly further away from the other bands and placed on the far right.
Edge Case: If you have a 5-band or 6-band resistor with a 2% tolerance (Red band), there is no Gold or Silver to act as a visual anchor. In this case, look for the wider physical gap between the multiplier band and the tolerance band, or use a multimeter to verify your left-to-right assumption.
Does the color code of resistance bands apply to surface mount (SMD) resistors?
No. SMD resistors are too small for painted bands. Instead, they use a printed numeric code based on a completely different standard.
For 5% SMDs, a 3-digit code is used: the first two digits are significant, and the third is the multiplier (e.g., 103 = 10 × 10³ = 10,000Ω or 10kΩ).
For 1% SMDs, a 4-digit code is used (e.g., 1002 = 100 × 10² = 10kΩ).
High-precision 0603 size 1% SMDs use the EIA-96 standard, which consists of two digits and a letter (e.g., 01C = 10kΩ). If you are transitioning from axial to SMD design, you must discard the color code chart and reference an EIA-96 lookup table.
