To read a 5 band resistor color code, identify the first three bands as the significant digits, the fourth band as the multiplier, and the fifth band as the tolerance. For example, a resistor with Brown-Black-Black-Red-Brown bands equals 10,000 Ω (10 kΩ) at ±1% tolerance. Unlike 4-band resistors used for 5% and 10% tolerances, the 5-band format is the standard for precision 1% (and sometimes 2%) metal film resistors, giving you three significant digits instead of two.
The 5 Band Resistor Color Code Reference Chart
Use this table to decode any standard axial 5-band resistor. Read the bands from left to right, starting from the end where the bands are grouped closest together, leaving the wider-spaced tolerance band on the right.
| Color | Band 1 (1st Digit) | Band 2 (2nd Digit) | Band 3 (3rd Digit) | Band 4 (Multiplier) | Band 5 (Tolerance) |
|---|---|---|---|---|---|
| Black | 0 | 0 | 0 | ×1 Ω | — |
| Brown | 1 | 1 | 1 | ×10 Ω | ±1% (F) |
| Red | 2 | 2 | 2 | ×100 Ω | ±2% (G) |
| Orange | 3 | 3 | 3 | ×1 kΩ | — |
| Yellow | 4 | 4 | 4 | ×10 kΩ | — |
| Green | 5 | 5 | 5 | ×100 kΩ | ±0.5% (D) |
| Blue | 6 | 6 | 6 | ×1 MΩ | ±0.25% (C) |
| Violet | 7 | 7 | 7 | ×10 MΩ | ±0.1% (B) |
| Grey | 8 | 8 | 8 | — | ±0.05% (A) |
| White | 9 | 9 | 9 | — | — |
| Gold | — | — | — | ×0.1 Ω | ±5% (J) |
| Silver | — | — | — | ×0.01 Ω | ±10% (K) |
Decoding the Bands: What Each Row Means in Practice
Let us break down a real-world bench example. You are repairing a power supply and find a burnt resistor. You clean it off and read the bands: Red, Violet, Black, Orange, Brown.
- Band 1 (Red): 2
- Band 2 (Violet): 7
- Band 3 (Black): 0
- Band 4 (Orange): ×1,000 (kΩ)
- Band 5 (Brown): ±1%
Calculation: 270 × 1,000 = 270,000 Ω, or 270 kΩ ±1%. Because this is a 1% resistor, it belongs to the E96 standard value series. If you measure it with a multimeter and it reads 271.5 kΩ, it is still well within its 2.7 kΩ tolerance window and is likely fine. If it reads 310 kΩ, the carbon film has degraded from heat, and it must be replaced.
Standard Variants: IEC 60062 vs. MIL-SPEC vs. Legacy
A common point of confusion for beginners crossing over from home wiring is assuming regional electrical codes like NEC (US) or IEC 60446 (EU) apply to component markings. They do not. Wire color codes change by region; resistor color codes do not. Component markings are universally governed by the IEC 60062 standard globally. However, you will encounter two specific variants in the wild:
| Standard | Application | Key Differences from IEC 60062 |
|---|---|---|
| IEC 60062 | Global commercial/consumer electronics | The baseline chart provided above. Universally adopted for commercial axial resistors. |
| MIL-PRF-55342 | US Military / Aerospace | Often uses 5-band codes identical to IEC, but high-reliability mil-spec parts may use surface-printed alphanumeric codes (e.g., '2703F') instead of painted bands to prevent flaking in vacuum environments. |
| BS1852 (Legacy UK) | Old British equipment (pre-1990s) | Used identical color bands but frequently appended a printed letter suffix for tolerance (e.g., 'R' for ±2%, 'K' for ±10%) rather than relying solely on the final painted band. |
The 'Rows People Get Wrong' Trap Guide
Even experienced technicians misread bands under poor bench lighting. Here are the specific traps that cause incorrect component selection:
Under warm LED bench lights, a red band (2) and an orange band (3) look nearly identical. A 220 Ω resistor (Red-Red-Black-Black-Brown) misread as 320 Ω (Orange-Red-Black-Black-Brown) will cause a 45% error in a current-sense circuit. Fix: Take the resistor to a neutral white daylight lamp or use your phone camera with the flash on to differentiate the hues.
Trap 2: Black vs. Brown Multipliers (×1 vs. ×10)
The 4th band multiplier is where most catastrophic math errors happen. Black means ×1 (no zeros added). Brown means ×10 (add one zero). If you read a 100 Ω resistor (Brown-Black-Black-Black-Brown) and mistake the 4th band for Brown, you will calculate 1,000 Ω. Always verify low-value resistors with a multimeter in continuity/ohms mode.
Trap 3: Gold and Silver as Digits
Gold and Silver never appear in the first three bands. They are strictly used for multipliers (Band 4) or tolerances (Band 5). If you see a gold band, it is either the multiplier (×0.1) or a 5% tolerance marker. If a 'gold' band appears in the first three positions, you are likely looking at a faded yellow band or a 4-band resistor where the gold is the tolerance, and you are reading it backward.
Trap 4: Reading Backward
Manufacturers space the tolerance band (Band 5) slightly further away from the other four bands. If the spacing is ambiguous, look for a gold or silver band. Since gold and silver cannot be significant digits, whichever end has the gold/silver band is the right side (tolerance), meaning you must read from the opposite end.
Decision Path: Reading Faded, Burnt, or Ambiguous Resistors
When a resistor has been subjected to thermal stress, the epoxy coating darkens, and the painted bands turn into indistinguishable brown smudges. Do not guess. Follow this decision tree to identify the correct replacement value.
| Symptom / Observation | Measurement / Action | Concrete Resolution |
|---|---|---|
| Bands are faded but resistor body is intact (not charred). | Measure resistance in-circuit with a DMM. If reading is stable, desolder one leg and measure out-of-circuit. | Pick: Match the measured value to the nearest standard E24 or E96 series value. Buy a 1/4W 1% metal film replacement. |
| Resistor is charred/blackened; bands are completely destroyed. | Do NOT trust a DMM reading (carbon tracking alters resistance). Scrape away the burnt epoxy to expose the inner film and measure, OR trace the circuit schematic. | Pick: Identify the circuit block. If it is a base-drive resistor for a BJT, default to a standard 1kΩ or 4.7kΩ 1/2W metal oxide. If it is a mains bleed resistor, use a 1MΩ 2W flameproof resistor. |
| Resistor measures 'OL' (Open Loop) on DMM; bands are ambiguous. | The resistor has failed open due to overcurrent. Check the voltage rating of the surrounding components (e.g., capacitors rated for 25V). | Pick: Calculate the required wattage using P = V²/R based on the rail voltage. Replace with a 1% metal film resistor rated for at least 2x the calculated wattage dissipation. |
| Band 4 and Band 5 look identical (e.g., both look brown). | Assume it is a 1% resistor (Brown tolerance). Test both directional readings against known E96 values. | Pick: Whichever directional read yields a valid E96 standard value (e.g., 4.75kΩ instead of a non-standard 1.14kΩ) is the correct orientation. Order the verified E96 value. |
When in doubt, always default to measuring the physical component out-of-circuit and cross-referencing the result against standard E-series value charts. Relying purely on visual inspection of degraded 5 band resistor color codes is a reliable way to introduce subtle calibration errors into precision analog builds.
