Electronics Calculators & Tools
Professional electronics calculators for engineers, makers, and students. Interactive visualizations, standard component values, and instant calculations — all free in your browser.
Ohms Law Calculator
Calculate voltage, current, resistance, and power instantly. Interactive Ohm's Law wheel, animated circuit diagram, and practical presets.
Resistor Color Code Calculator
Decode resistor color bands or find band colors by resistance value. Interactive SVG, 4/5/6 bands, tolerance range, E-series matching.
Capacitor Code Decoder
Decode 3-digit capacitor markings to pF/nF/µF or find the code from a capacitance value. Voltage ratings, tolerance codes, unit converter.
SMD Code Decoder
Decode SMD component markings — 3-digit, 4-digit, and EIA-96 codes for resistors and capacitors. Reverse lookup and package size reference.
LED Resistor Calculator
Calculate the current-limiting resistor for any LED circuit. Color presets, series/parallel arrays, power warnings, nearest E24 value.
Voltage Divider Calculator
Calculate voltage divider output, find R1/R2 from desired Vout, E24 matching, load effects, tolerance analysis, and power dissipation.
Wire Gauge Calculator (AWG)
Find the right wire gauge for your project. AWG↔mm² converter, voltage drop calculator, ampacity tables, copper and aluminum support.
PCB Trace Width Calculator
Calculate minimum PCB trace width for a given current using IPC-2221 standard. Supports internal/external layers, multiple copper weights, and voltage drop.
555 Timer Calculator
Calculate NE555 timer circuits — astable and monostable modes. Frequency, duty cycle, waveform preview, and reverse component calculation.
Circuit Simulator
Build and simulate electronic circuits in your browser. Drag-and-drop components, animated current flow, real-time voltage and current readouts.
