Math & Science
Motståndets färgkodskalkylator
Decode resistor values from color bands
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Frequently asked questions
How do I read the bands?
Start from the band closest to one end. That's band 1.
What does each band mean?
4-band: digit, digit, multiplier, tolerance. 5-band adds third digit.
What is the gold/silver band?
Typically tolerance: Gold = ±5%, Silver = ±10%.
Related tools
About this tool
Inputs
- Resistance Value
- Mode
- Number of Bands
- Band Colors
- Colors to value
- Value to colors
- Band
- Black
- Brown
- Red
- Orange
- Yellow
- Green
- Blue
- Violet
- Gray
- White
- Gold
- Silver
Results
- Resistance
- Tolerance
- Temp Coefficient
Getting the right answer starts with the right formula. The Resistor Color Code Calculator handles the computation so you can focus on the decision. Enter resistance value, mode, number of bands, band colors, colors to value, value to colors, band, black, brown, red, orange, yellow, green, blue, violet, gray, white, gold and silver. The tool processes your data and returns resistance, tolerance and temp coefficient. Understanding the underlying principle helps you judge whether a result is reasonable. Whether you need to decode resistor values from color bands for a quick check or a thorough analysis, this tool adapts to both.
4-band: digit, digit, multiplier, tolerance. 5-band adds third digit. Rounding to the appropriate number of significant figures avoids false precision. Results are rounded for display; the underlying computation retains full precision. Percentage change is computed as (new − old) / old × 100, one of the most universally useful formulas. Visualizing a mathematical relationship often makes the result more intuitive than the raw number alone.