The standard EIA/IEC color resistor chart maps Black to 0, Brown to 1, Red to 2, Orange to 3, Yellow to 4, Green to 5, Blue to 6, Violet to 7, Gray to 8, and White to 9, with Gold and Silver reserved for multipliers and tolerance. For a standard 5-band 10kΩ 1% resistor, the bands are Brown (1), Black (0), Black (0), Red (x100), and Brown (1% tolerance). While 4-band resistors (2 digits, 1 multiplier, 1 tolerance) are common for 5% carbon films, modern precision metal film resistors use 5 or 6 bands to accommodate three significant digits and a temperature coefficient.
The Master Resistor Color Code Chart (IEC 60062)
The following table defines the complete EIA RS-279 / IEC 60062 standard mapping. To read this table correctly, orient the resistor so the Gold or Silver tolerance band is on the far right. Read the significant digits from left to right, apply the multiplier, and then apply the tolerance and temperature coefficient limits.
| Color | Digit Value (Bands 1, 2, 3) |
Multiplier (Band 4) |
Tolerance (Band 5) |
Tempco (ppm/°C) (Band 6) |
|---|---|---|---|---|
| Black | 0 | ×1 (10⁰) | — | 250 |
| Brown | 1 | ×10 (10¹) | ±1% (F) | 100 |
| Red | 2 | ×100 (10²) | ±2% (G) | 50 |
| Orange | 3 | ×1k (10³) | — | 15 |
| Yellow | 4 | ×10k (10⁴) | ±0.5% (D) | — |
| Green | 5 | ×100k (10⁵) | ±0.25% (C) | — |
| Blue | 6 | ×1M (10⁶) | ±0.10% (B) | 10 |
| Violet | 7 | ×10M (10⁷) | ±0.05% (A) | 5 |
| Gray | 8 | — | ±0.01% (T) | — |
| White | 9 | — | — | — |
| Gold | — | ×0.1 (10⁻¹) | ±5% (J) | — |
| Silver | — | ×0.01 (10⁻²) | ±10% (K) | — |
Quick-Jump: Most Queried 5-Band Resistor Values
Bookmark this section for the most common 1% metal film values you will encounter on the bench. These assume a standard 5-band configuration (3 digits, 1 multiplier, 1 tolerance).
| Nominal Value | Band 1 | Band 2 | Band 3 | Band 4 (Multiplier) | Band 5 (Tolerance) |
|---|---|---|---|---|---|
| 100 Ω | Brown (1) | Black (0) | Black (0) | Black (×1) | Brown (±1%) |
| 220 Ω | Red (2) | Red (2) | Black (0) | Black (×1) | Brown (±1%) |
| 1 kΩ | Brown (1) | Black (0) | Black (0) | Brown (×10) | Brown (±1%) |
| 4.7 kΩ | Yellow (4) | Violet (7) | Black (0) | Brown (×10) | Brown (±1%) |
| 10 kΩ | Brown (1) | Black (0) | Black (0) | Red (×100) | Brown (±1%) |
| 47 kΩ | Yellow (4) | Violet (7) | Black (0) | Red (×100) | Brown (±1%) |
| 100 kΩ | Brown (1) | Black (0) | Black (0) | Orange (×1k) | Brown (±1%) |
Tolerance, Tempco, and Real-World Drift
The color chart gives you the nominal value, but which column applies to your installation depends entirely on your circuit's sensitivity. For 90% of digital pull-ups, LED current limiting, and basic biasing, the tolerance band (Band 5) is all that matters—a 5% or 1% deviation won't break the logic. However, if you are designing an analog front-end, an ADC voltage divider, or a current shunt, Band 6 (Temperature Coefficient) becomes the critical column.
How Derating and Tempco Modify the Base Value:
A 10kΩ resistor with a 1% tolerance and a 50ppm/°C tempco seems precise at 25°C. But if that resistor sits next to a voltage regulator and its local ambient temperature rises to 75°C (a 50°C delta), the tempco drift calculation is:
ΔR = Nominal × Tempco × ΔT
ΔR = 10,000 Ω × (50 / 1,000,000) × 50°C = 25 Ω
Your 10kΩ resistor has now drifted by 25Ω purely from heat, which is a 0.25% shift. Combined with the initial ±1% manufacturing tolerance (which could already put it at 10,100Ω), your real-world operating resistance could be 10,125Ω. In a 12-bit ADC reference divider, this drift introduces measurable non-linearity. This is why precision analog designs mandate 0.1% tolerance and ≤15ppm/°C tempco resistors, regardless of what the basic color chart implies.
Furthermore, power derating modifies the base wattage value. A standard 1/2W metal film resistor is only rated for 0.5W up to 70°C ambient. According to Vishay's CMF series datasheet, above 70°C the power rating derates linearly, hitting 0W at 155°C. If your PCB sits in a 90°C enclosure, that 1/2W resistor can only safely dissipate ~0.35W before the film degrades.
What the Color Chart Cannot Tell You
Relying solely on the color bands is a common beginner mistake. The EIA color code specifies resistance, multiplier, tolerance, and tempco. It cannot tell you:
- Power Rating (Wattage): A 10kΩ 5-band resistor could be a 1/8W miniature, a 1/4W standard, or a 1/2W oversized package. You must judge wattage by physical size (e.g., 0204 body = 1/4W, 0207 body = 1/2W) or read the packaging.
- Maximum Working Voltage: A 1MΩ 1/4W resistor theoretically passes 0.5mA at 500V (P = V²/R). However, standard 1/4W resistors have a maximum working voltage limit of 250V. Exceeding this causes internal arcing across the film cut, regardless of the wattage math.
- Parasitic Inductance and Capacitance: The color bands on a 100Ω wirewound resistor and a 100Ω metal film resistor look identical. But the wirewound version acts as an inductor at high frequencies, ruining RF and high-speed digital termination. Always check the construction type (metal film, thick film, or wirewound) for AC applications.
- Noise Characteristics: Carbon composition resistors generate significant thermal and current noise compared to metal film. The color chart won't warn you if you place a carbon comp in a low-noise audio preamp.
Decision Tree: Picking the Right Resistor Beyond the Bands
Use this decision path to select the exact resistor specification for your build, moving past the basic color code into real-world component selection.
| Application Scenario | Required Tolerance | Required Tempco | Construction Type | Concrete Pick / Series |
|---|---|---|---|---|
| I2C Pull-ups, LED Limiting, Logic Biasing | 5% or 1% | Any (200ppm is fine) | Thick Film or Standard Metal Film | Yageo CFR-25 (1/4W, 5%) or standard generic 1% metal film kits. |
| Op-Amp Gain Networks, Active Filters | 1% or 0.1% | ≤ 50ppm/°C | Metal Film | Vishay Dale CMF55 (1/2W, 1%, 50ppm) or CMF60 for higher power. |
| ADC Voltage References, Precision Shunts | 0.1% or better | ≤ 15ppm/°C | Precision Metal Film / Bulk Metal Foil | Vishay Z-Foil or Susumu RG series (SMD) / PRP series (Through-hole). |
| RF Termination, High-Speed Digital Snubbers | 1% to 5% | Any | Thick Film (SMD) or Carbon Comp (Axial) | Panasonic ERJ series (SMD) or Xicon carbon comp (avoid wirewound). |
The Default Bench Recommendation: If you are stocking your lab and want to minimize inventory while covering 95% of through-hole prototyping needs, buy the Vishay Dale CMF55 series (1/2W, 1%, 50ppm/°C, metal film). Because they are rated for 1/2W, you can safely use them in 1/4W circuits with double the thermal headroom, and their 1% tolerance and low tempco are sufficient for all but the most extreme precision analog work. Keep a small supplemental kit of 5% 1/4W carbon films strictly for high-voltage snubbers or vintage audio restoration where specific noise profiles are required.
