Fast, accurate calculators for resistors, LEDs, Ohm's law, voltage dividers, and more. Built for engineers, students, and makers.
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Decode or encode resistor color bands. Get resistance, tolerance, E-series info, and practical insights.
Calculate voltage, current, resistance, and power. Visual circuit diagram with real-time updates.
Find the right current-limiting resistor for your LED. Supports series and parallel LED strings.
Calculate output voltage for any resistor divider network. Includes loading effect analysis.
E-series tables, color code charts, standard capacitor values, and common component specs.
Capacitor codes, inductor calc, frequency tools...