ResistorCalc Pro
Professional resistor color code calculator with advanced features for electronics engineers, students, and hobbyists
Select colors to calculate resistance value
Understanding Different Band Configurations
These are becoming rare, but you'll still find them in older equipment. Two significant digits plus a multiplier. No tolerance band means ±20% tolerance—not great for precision work.
When you'll see them: Vintage electronics, very basic applications where precision doesn't matter.
The standard for most hobbyist and general-purpose applications. Two significant digits, multiplier, and tolerance. Usually ±5% tolerance (gold band) or ±10% (silver band).
When you'll see them: Arduino projects, basic circuits, general electronics.
Three significant digits for better precision. Common in professional equipment where you need values like 10.2kΩ instead of just 10kΩ. Usually ±1% tolerance.
When you'll see them: Audio equipment, precision analog circuits, measurement instruments.
Everything from 5-band plus a temperature coefficient band. These are for applications where temperature changes could affect circuit performance.
When you'll see them: Precision instruments, calibration equipment, high-end audio gear.
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