The 8.2k (8,200 Ω) resistor color code is Grey-Red-Red for a standard 4-band resistor, or Grey-Red-Black-Brown for a 5-band precision resistor. The final band indicates tolerance, which is typically Gold (±5%) or Brown (±1%). Unlike household wiring, which varies by region, resistor bands follow a single global standard, meaning an 8.2k resistor reads the same whether you are in the US, UK, or EU.
8.2k Resistor Color Code Reference Tables
Before grabbing your multimeter, use the tables below to verify the bands on your component. The first table breaks down the exact 8.2k (8,200 ohm) sequence across the three most common through-hole formats.
| Format | Band 1 (Digit 1) | Band 2 (Digit 2) | Band 3 (Digit 3 / Mult) | Band 4 (Mult / Tol) | Band 5 (Tol / Temp) | Band 6 (Tempco) |
|---|---|---|---|---|---|---|
| 4-Band (±5%) | Grey (8) | Red (2) | Red (×100) | Gold (±5%) | N/A | N/A |
| 5-Band (±1%) | Grey (8) | Red (2) | Black (0) | Brown (×10) | Brown (±1%) | N/A |
| 6-Band (High Precision) | Grey (8) | Red (2) | Black (0) | Brown (×10) | Brown (±1%) | Red (50 ppm/°C) |
To understand how these values are derived, you need the master IEC 60062 color code chart. Here is the data-dense reference for the significant digits and multipliers you will encounter when reading any axial resistor.
| Color | Significant Digit | Multiplier (4-Band) | Multiplier (5-Band) | Tolerance | Tempco (ppm/°C) |
|---|---|---|---|---|---|
| Black | 0 | ×1 (10⁰) | — | — | 250 |
| Brown | 1 | ×10 (10¹) | ×10 (10¹) | ±1% | 100 |
| Red | 2 | ×100 (10²) | ×100 (10²) | ±2% | 50 |
| Orange | 3 | ×1k (10³) | ×1k (10³) | — | 15 |
| Yellow | 4 | ×10k (10⁴) | ×10k (10⁴) | — | 25 |
| Green | 5 | ×100k (10⁵) | ×100k (10⁵) | ±0.5% | — |
| Blue | 6 | ×1M (10⁶) | ×1M (10⁶) | ±0.25% | 10 |
| Violet | 7 | ×10M (10⁷) | ×10M (10⁷) | ±0.1% | 5 |
| Grey | 8 | — | — | ±0.05% | — |
| White | 9 | — | — | — | — |
| Gold | — | ×0.1 | ×0.1 | ±5% | — |
| Silver | — | ×0.01 | ×0.01 | ±10% | — |
Standard Variants: IEC 60062 vs. MIL-SPEC vs. Regional Wiring Confusion
A frequent point of confusion for beginners crossing over from home wiring to electronics is the assumption that component colors follow regional electrical codes. While AC mains wiring varies wildly by region—for example, the US uses NEC Article 200/210 (White/Green/Bare for neutral/ground), Europe uses IEC 60446 (Blue/Yellow-Green), and the old UK system used Black/Green—resistor color codes have no regional variants.
However, there are application-specific standard variants you should know:
- IEC 60062 (Commercial Global): The standard detailed in the tables above. Used for 99% of hobbyist, commercial, and industrial through-hole resistors.
- MIL-PRF-22684 (Military/Defense): Uses the standard IEC color bands for value, but historically added a 5th or 6th band to indicate reliability failure rates (e.g., a Yellow band for 0.001% failure rate per 1,000 hours). Modern MIL-SPEC parts largely rely on laser etching or SMD formats.
- EIA-96 / 3-Digit SMD Codes: If you are working with surface-mount devices (SMD) instead of axial leads, color bands disappear. An 8.2k 5% SMD resistor will be marked 822 (82 × 10²) or 8201 (820 × 10¹) for 1% tolerance.
Rows and Bands People Get Wrong on the Bench
Even experienced engineers misread resistors under poor lighting. When hunting for an 8.2k resistor in your bin, watch out for these specific traps:
1. The 5-Band "Black" Multiplier Trap
In a 4-band resistor, Black as a multiplier means ×1 (10⁰). But in a 5-band resistor, Black is the third significant digit (0). If you misread a 5-band 8.2k (Grey-Red-Black-Brown) as having a Black multiplier (Grey-Red-Black-Black), you will calculate 820 × 1 = 820 Ω. Always count the bands first; if there are five, the fourth band is your multiplier (Brown = ×10).
2. Red (2) vs. Orange (3) Under Warm LEDs
Under the warm 3000K LED lighting common in modern workshops, the Red band (2) on an 8.2k resistor can easily look Orange (3). If you misread it as Grey-Orange-Red, you are holding an 8.3k resistor—a standard E24 value, but one that will throw off a precision voltage divider. Fix: Take the resistor to a 5000K daylight lamp or use a digital component tester.
3. Finding the Tolerance Band (Orientation)
Which end do you start reading from? Gold and Silver are never used as significant digits. If you see a Gold or Silver band on the far right, that is your tolerance band, and you read left-to-right. If the resistor has Brown tolerance bands on both ends (common with 1% metal film), look for the physical gap: the spacing between the multiplier band and the tolerance band is usually slightly wider than the spacing between the significant digits.
Safe Interpretation When Markings are Faded or Burnt
Carbon composition resistors from the 1970s, or resistors that have run hot in a power supply, often feature burnt, blistered, or completely faded color bands. When visual identification fails, you must rely on electrical measurement.
Bench Rule: Never trust the color code of a resistor that shows physical signs of thermal stress (charring, cracked epoxy, or melted solder joints). The internal carbon or metal film track may have fractured, permanently altering its resistance.
How to Measure Safely with a DMM
- De-energize the Circuit: Never measure resistance in a live circuit. Your multimeter injects a small test voltage to measure resistance; external voltage will yield false readings and can blow the meter's internal fuse or destroy the ADC.
- Isolate the Component (Out-of-Circuit): If you measure an 8.2k resistor while it is still soldered into a PCB, you are actually measuring the parallel equivalent of the resistor and the rest of the circuit. A parallel path of 8.2k will always result in a DMM reading lower than 8.2k. Desolder at least one leg of the resistor to lift it off the pad.
- Zero the Probes: Touch your multimeter probes together. If your meter reads 0.2 Ω, subtract that from your final measurement to account for probe wire resistance (critical for low-value resistors, though negligible for an 8.2k part).
- Read and Verify: A healthy 8.2k ±5% resistor will read between 7,790 Ω and 8,610 Ω. If your DMM reads "OL" (Over Limit), the resistor is blown open and must be replaced.
For rapid sorting of unmarked or faded axial leads, bypass the DMM entirely and use an LCR meter or a dedicated transistor/resistor tester (like the popular TC1 or Mega328-based testers). These clamshell testers use a zero-insertion-force (ZIF) socket to instantly identify the resistance, tolerance, and even the inductance of the component leads in under a second, saving you from squinting at faded paint under a magnifying lamp.
