EB Toolbox: Electronics Tools

Put 157 electronics calculators and a component datasheet finder in your pocket.



EB Toolbox helps you work out circuit values, choose component values and explore electronics calculations from your phone. From an LED resistor calculator to PCB trace width and battery life estimates, keep useful tools together for your next project.



Made for electronics students, hobbyists, technicians and makers, with dedicated inputs, clear results and visual illustrations to help connect calculations with circuits.



Explore the calculator collection



• Ohm's law and circuit basics
Calculate voltage, current, resistance and power with the Ohm's Law Calculator. Work through Voltage Divider, Current Divider, Wheatstone Bridge, Star-Delta and Thevenin-Norton calculations.



• Resistors and component codes
Use the LED Resistor Calculator, Resistor Color Code, SMD Resistor Code and Series & Parallel Resistors. Find standard component values with E-Series Finder and explore combinations with Reverse E-Series.



• Capacitors and inductors
Decode Capacitor Code and Inductor Color Code. Calculate series and parallel values, Capacitive Reactance, Inductive Reactance, Capacitor Energy, RC Time Constant and RC Charge/Discharge Time. Explore changing values with the interactive RC Curve Simulator.



• 555 timers, transistors and op-amps
Work with the 555 Timer Calculator, Transistor Base Resistor, Transistor Bias, Op-Amp Gain, Summing Amplifier and Differential Amplifier. Calculate regulator values with LM317 and Zener Regulator tools.



• Filters and AC circuits
Find Filter Cutoff Frequency, LC Resonance and RLC Impedance. Explore Sallen-Key filters, Q Factor, RMS voltage conversion, Power Factor and Three-Phase Power.



• Power supplies and batteries
Estimate Battery Life, Battery Charging Time and UPS Runtime. Calculate Battery Pack configurations, Transformer Turns Ratio, Rectifier Ripple and Regulator Power Dissipation. Explore Buck, Boost and Buck-Boost Converter basics.



• PCB design, cables and heat
Use the PCB Trace Width Calculator, PCB Via Current Capacity, Voltage Drop Calculator and AWG Converter when planning board traces and wiring. Explore Microstrip Impedance, Wire Resistance and Heatsink Thermal Resistance.



• Audio and radio frequency
Calculate Speaker Impedance, Speaker Crossover and Amplifier Power. Convert decibels and dBm to watts. Explore Dipole Antenna Length, SWR, Frequency and Wavelength, and RF Impedance Matching.



• Motors, digital circuits and measurement
Calculate Motor Torque and RPM, Motor Efficiency and Stepper Motor values. Work with ADC Resolution, MCU Timer & Prescaler, UART Baud Rate Error, Pull-up Resistors, PWM filters and Number Base Conversion.



Find component datasheets
Search by part number and follow links to available datasheet resources. Check the manufacturer's specifications, pin connections and operating limits while planning your circuit.



From a single component to a wider circuit calculation, choose a tool, enter your values and explore the result.



Built to keep growing
157 calculators is just the beginning. We plan to grow EB Toolbox with more electronics tools, improvements to existing calculators and refinements to the app experience in future updates. Your feedback helps us understand what would be most useful for your projects.



Get EB Toolbox and put 157 calculators to work on your next electronics project.



Internet access is needed for initial content downloads and online features, including datasheet search. Contains ads.



Verify calculations against component specifications and your circuit's operating conditions before practical use.



Support: dev@elwarbraja.com

Recent changes:
Welcome to the first production release of EB Toolbox!

Explore practical electronics calculators for circuit design, component selection, troubleshooting, and everyday electronics work.

More tools and improvements are coming in future updates.