Electronics Calculators
Essential electronics calculation tools for hobbyists and engineers. Calculate resistor values, Ohm's law, LED resistors, voltage dividers, capacitor codes, and PCB trace widths.
Resistor Color Code Calculator
Calculate resistance values from color bands. Supports 4-band and 5-band resistors with visual color selector.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to find the others.
Voltage Divider Calculator
Calculate output voltage for a resistive voltage divider circuit. Find the right resistor values for your project.
LED Resistor Calculator
Calculate the required series resistor for LED circuits. Includes presets for common LED colors and power rating recommendations.
Battery Life Calculator
Calculate how long a battery will last based on capacity and current draw. Includes presets for common battery types.
PCB Trace Width Calculator
Calculate minimum PCB trace width for a given current using IPC-2221 standard. Includes voltage drop and power loss.
Capacitor Code Converter
Convert capacitor codes (like 104) to actual values in pF, nF, and µF. Includes common code reference.
555 Timer Calculator
Calculate frequency and timing for 555 timer circuits. Supports astable (oscillator) and monostable (one-shot) modes.
AWG to mm Converter
Convert American Wire Gauge (AWG) to metric measurements. Includes diameter, area, and resistance per length.
Heat Sink Calculator
Calculate required thermal resistance for heat sinks. Includes junction, case, and heat sink temperature calculations.