Resistor Color Code Decoder
Decode any resistor color code instantly with our free resistor color code decoder. Select the color bands on your 3, 4, 5, or 6-band resistor to get the resistance value, tolerance, min/max range, and E-series classification - or use Encode mode to find the correct color bands for any resistance value. Includes a full color band reference chart and TCR decoding for 6-band precision resistors. No signup required.
Select the color bands on your resistor to instantly decode its resistance value, tolerance, and temperature coefficient. Supports 3, 4, 5, and 6-band resistors. All calculations run locally in your browser - no data is sent to any server.
| Color | Digit | Multiplier | Tolerance | TCR |
|---|---|---|---|---|
Black | 0 | ×1 | - | 250 ppm/°C |
Brown | 1 | ×10 | ±1% | 100 ppm/°C |
Red | 2 | ×100 | ±2% | 50 ppm/°C |
Orange | 3 | ×1k | - | 15 ppm/°C |
Yellow | 4 | ×10k | - | 25 ppm/°C |
Green | 5 | ×100k | ±0.5% | 20 ppm/°C |
Blue | 6 | ×1M | ±0.25% | 10 ppm/°C |
Violet | 7 | ×10M | ±0.1% | 5 ppm/°C |
Gray | 8 | ×100M | ±0.05% | - |
White | 9 | ×1000M | - | - |
Gold | - | ×0.1 | ±5% | - |
Silver | - | ×0.01 | ±10% | - |
Why Use Our Resistor Color Code Decoder?
Instant Resistor Color Code Decoding
Decode any resistor color code instantly in your browser with zero wait time. Our resistor color code decoder supports 3, 4, 5, and 6-band resistors and delivers the resistance value, tolerance range, and E-series classification in milliseconds.
Secure Resistor Color Code Decoder Online
All resistor color code calculations happen locally in your browser. Your band selections never leave your device - the resistor color code decoder processes everything client-side with complete privacy and no data transmission.
Resistor Color Code Decoder - No Installation
Use our resistor color code decoder directly in any modern browser with no downloads, plugins, or signup required. Decode resistor color codes from any device - desktop, tablet, or mobile - instantly and for free.
Decode and Encode - Both Directions
Our resistor color code decoder works both ways: select color bands to get the resistance value, or enter a resistance value to get the correct color band sequence. The built-in encoder supports 4-band and 5-band output with your choice of tolerance.
Common Use Cases for Resistor Color Code Decoder
Electronics Prototyping
Quickly identify resistor values when building circuits on a breadboard or PCB. Our resistor color code decoder eliminates the need to memorize the color band chart, letting you focus on your circuit design.
Component Sorting and Inventory
Sort and label loose resistors from a mixed component bin by decoding each color band sequence. The resistor color code decoder helps you organize your electronics inventory accurately and efficiently.
Electronics Education and Learning
Students and hobbyists use our resistor color code decoder to learn the standard color band system. The built-in reference chart and visual resistor display make it easy to understand how color codes map to resistance values.
PCB Repair and Troubleshooting
Identify the value of resistors on a circuit board during repair work without a multimeter. The resistor color code decoder lets you quickly verify component values from the color bands alone.
Precision Resistor Selection
Use the 5-band and 6-band decoder modes to identify precision resistors with 1% or tighter tolerances. The 6-band mode also decodes the temperature coefficient (TCR) band for high-precision applications.
Value-to-Color Encoding
Use the encode mode to find the correct color band sequence for a target resistance value. Enter any resistance in ohms and instantly get the 4-band or 5-band color code to order or verify the right component.
Understanding Resistor Color Codes
What is a Resistor Color Code?
A resistor color code is a standardized system of colored bands printed on resistors to indicate their resistance value, tolerance, and sometimes temperature coefficient. Defined by the IEC 60062 standard, the color code uses 10 colors (black through white) to represent digits 0-9, plus gold and silver for multipliers and tolerance values. Our resistor color code decoder supports all four common band configurations - 3-band, 4-band, 5-band, and 6-band - covering everything from basic carbon film resistors to precision metal film components. Reading resistor color codes accurately is a fundamental skill in electronics, and our decoder makes it instant and error-free.
How Our Resistor Color Code Decoder Works
- Select Your Band Count: Choose 3, 4, 5, or 6 bands depending on your resistor type. Most common resistors use 4 bands; precision resistors use 5 or 6 bands. The resistor color code decoder updates the band selectors automatically.
- Choose Each Band Color: Select the color of each band from left to right using the dropdown selectors. The visual resistor diagram updates in real time to show your selections. All calculations run entirely in your browser - your data never leaves your device.
- Read Your Results: Click Decode Resistor to instantly see the resistance value, tolerance, minimum and maximum values, E-series classification, and (for 6-band resistors) the temperature coefficient. Use the Encode mode to reverse the process - enter a resistance value and get the correct color bands.
What Each Band Represents
- Digit Bands (1st, 2nd, and optionally 3rd): Each digit band represents one significant figure of the resistance value. 4-band resistors have 2 digit bands; 5- and 6-band resistors have 3 digit bands for higher precision.
- Multiplier Band: The multiplier band specifies the power of 10 to multiply the digit value by. Gold (×0.1) and silver (×0.01) allow sub-ohm values; colors from black (×1) to white (×10⁹) cover the full range.
- Tolerance Band: The tolerance band indicates the acceptable deviation from the nominal value. Gold (±5%) and silver (±10%) are most common; brown (±1%) and red (±2%) indicate precision resistors.
- TCR Band (6-band only): The temperature coefficient of resistance (TCR) band indicates how much the resistance changes per degree Celsius, measured in ppm/°C. Brown (100 ppm/°C) through violet (5 ppm/°C) cover standard TCR grades.
Understanding Tolerance and E-Series Values
The tolerance of a resistor defines the range within which the actual resistance is guaranteed to fall. A 1 kΩ resistor with ±5% tolerance will measure between 950 Ω and 1050 Ω. Our resistor color code decoder calculates and displays both the minimum and maximum values for your selected tolerance. Resistors are manufactured in standardized E-series values (E12, E24, E48, E96) that ensure even logarithmic spacing across each decade. The decoder identifies whether your decoded value matches a standard E12 or E24 series value, helping you verify that the resistor is a genuine standard component.
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Frequently Asked Questions About Resistor Color Code Decoder
A resistor color code decoder is a tool that translates the colored bands on a resistor into its resistance value, tolerance, and temperature coefficient. Our resistor color code decoder supports 3, 4, 5, and 6-band resistors and runs entirely in your browser - select your band colors and instantly get the decoded resistance value with no signup required.
Hold the resistor with the tolerance band (gold or silver) on the right. Read the remaining bands from left to right: the first bands are significant digits, the next band is the multiplier, and the last band is the tolerance. For 6-band resistors, the final band is the temperature coefficient. Our resistor color code decoder handles all band configurations automatically.
A 4-band resistor has two significant digit bands, one multiplier band, and one tolerance band - giving two significant figures of precision. A 5-band resistor adds a third digit band for three significant figures, making it a precision resistor. 5-band resistors typically have tighter tolerances (±1% or ±2%) and are used in precision circuits. Our resistor color code decoder supports both formats.
The 6th band on a resistor indicates the temperature coefficient of resistance (TCR), measured in parts per million per degree Celsius (ppm/°C). It shows how much the resistance changes with temperature. Brown (100 ppm/°C) is the most common; violet (5 ppm/°C) indicates a very stable precision resistor. Our resistor color code decoder decodes the TCR band for all 6-band resistors.
Absolutely. All resistor color code calculations happen entirely in your browser using JavaScript. Your band selections and resistance values are never sent to any server. No data is stored, logged, or shared - the resistor color code decoder processes everything locally on your device.
Yes - our resistor color code decoder is 100% free with no signup, no account, and no usage limits. Decode as many resistors as you need, completely free forever. There are no ads, no premium tiers, and no hidden fees.
E-series values are standardized resistance values defined by IEC 60063 that are evenly spaced on a logarithmic scale. The E12 series has 12 values per decade (e.g. 1.0, 1.2, 1.5…), while E24 has 24. These series ensure that any resistance within a tolerance range can be covered by a standard value. Our resistor color code decoder identifies whether your decoded value matches an E12 or E24 standard value.
Yes - use the Encode mode in our resistor color code decoder. Enter your target resistance in ohms, select the desired tolerance and band count (4 or 5 bands), and the tool instantly shows the correct color band sequence. The encoded result is also applied to the decoder view so you can verify it visually.
Some resistors are manufactured to non-standard values for specific applications, or the color bands may be difficult to read accurately due to fading or unusual color shades. If the decoded value does not match an E-series value, double-check the band colors - especially distinguishing brown from red, orange from yellow, and blue from violet, which are common sources of misreading.