Developer Tools
Resistor Color Code Calculator
🔒 Runs in your browser
Decode resistor color bands to find resistance value and tolerance. Supports 4-band and 5-band resistors. Instant, browser-based.
Result
1.00 kΩ ±5%
Range: 950 Ω – 1.05 kΩ
How to Read Resistor Color Code — Free Calculator (2026)
Decode the colored bands on any resistor in your browser. Works in both directions: pick bands to read resistance, or enter a value to find the color sequence.