Electronics
Resistor Color Code Calculator
Quickly translate four or five-band resistor colors into resistance values, tolerance, and temperature coefficient.
Decode 4- or 5-band resistors with tolerance and optional temperature coefficient.
Band interpretation
Digits come from the first two or three bands, multiplied by the power indicated by the multiplier band. Tolerance and temperature coefficient are read from the final bands.
How to use
- Choose whether the resistor uses 4- or 5-band markings.
- Select each band color from the palettes provided.
- Read the resistance in ohms, tolerance range, and ppm/°C if present.
Example
Input: 5-band: Brown, Black, Black, Red, Brown
Output: Value = 10 kΩ ±1%, Tempco = 100 ppm/°C
Student-friendly breakdown
This walkthrough emphasizes the most searched ideas for Resistor Color Code Calculator: resistor color code calculator, 5 band resistor calculator, resistor color chart, resistor color code decoder. Start with the formula above, then follow the guided steps to double-check your work. For quick revision, highlight the givens, plug into the equation, and finish by verifying your units.
Need more support? Use the links below to open the long-form guide, browse additional examples, or hop into adjacent calculators within the same topic — each one is a quick way to double-check your work or handle a related question without starting from scratch.
Deep dive & study plan
Resistor Color Code Calculator: Decodes resistor band colors into resistance and tolerance. It's built around resistor color code, resistance, tolerance, so you can go from a raw question to a checked answer without switching tools.
The math behind it: Digits come from the first two or three bands, multiplied by the power indicated by the multiplier band. Tolerance and temperature coefficient are read from the final bands.
To use it well: (1) Choose whether the resistor uses 4- or 5-band markings. (2) Select each band color from the palettes provided. (3) Read the resistance in ohms, tolerance range, and ppm/°C if present. Keep your units consistent as you go, and re-run a case you already know the answer to — it's the fastest way to catch a typo before it throws off a result you're relying on.
Worked example: entering 5-band: Brown, Black, Black, Red, Brown returns Value = 10 kΩ ±1%, Tempco = 100 ppm/°C. Try swapping in your own numbers next, especially a case you're unsure about, before you use this for something that matters.
Quick retention checklist
- Speak the formula aloud (or annotate it) so the relationships stick.
- Write each step in your own words and compare with the numbered list above.
- Swap in new numbers for the Example to make sure the calculator (and your logic) handles edge cases.
- Check at least one related calculator below — it's the fastest way to confirm your numbers still line up from a different angle.
FAQ & notes
Does the order of bands matter?
Yes—start from the end closest to the tolerance band (often gold or silver). Enter the colors in that order so the decoded resistance matches the physical part.
Can I enter custom color sets?
The palette follows IEC standards. Extend the lookup tables inside the component if you need rare colors.
What formula does the Resistor Color Code Calculator use?
Digits come from the first two or three bands, multiplied by the power indicated by the multiplier band. Tolerance and temperature coefficient are read from the final bands.
How do I use the Resistor Color Code Calculator?
Choose whether the resistor uses 4- or 5-band markings. Select each band color from the palettes provided. Read the resistance in ohms, tolerance range, and ppm/°C if present.