Electronics Engineering Calculators, developed by SCHILLER App, is an Android application designed to assist students and enthusiasts in building electronic circuits. The app contains a wide range of tools, calculators, and guides that cover the most frequently used functions in the field of electronics engineering. It also includes other useful information for engineering students or electrical engineers, making it an excellent reference book. The app features a vast list of calculators for Ohm's Law, Resistors, Inductors, Capacitors, RLC Impedance, Voltage Regulator, Operational Amplifier, IC-555, Delta-Star Conversion, Battery, Converters, Wavelength, PCB trace resistance, Stepper Motor, Antenna Power Density, LED Resistor Value, Transformers, Zener Diode, AWG, Karnaugh Map, and Filters. Additionally, it includes pinouts for various devices, lists of materials, circuit symbols, and abbreviations, as well as guides for electricity, meters, oscilloscopes, analog and digital circuits, and power supply. The app is free and an excellent resource for engineering students and electrical engineers.