Multifunctional engineering calculations of electronic circuits and components

This tool allows you to determine which resistor you should use when you have a single LED or a number of the same color of LEDs in series. It displays resistor value, recommended resistor wattage as well as resistor color coding.

SMD Capacitor Code Calculator allows you to determine capacitance by the SMD (surface mount device) capacitor markings found on the device and to determine SMD capacitor markings by capacitance. It displays rated capacitance, capacitor tolerance and voltage.

SMD Inductor Code Calculator allows you to determine inductance of a SMD (surface mount device) inductor by the markings found on the device and to determine SMD inductor markings by inductance. It displays rated inductance and inductor tolerance.

A helpful tool for reading SMD (surface mount device) resistor markings found on the device. It displays rated resistance and resistor tolerance.

This calculator allows you to determine signal parameters of a square pulse generator built on the basis of the popular 555 microcircuit which can operate in astable (self-oscillating) mode.

This calculator allows you to determine signal parameters of a square pulse generator built on the basis of the popular 555 microcircuit which can operate in monostable mode.

This calculator is an online tool to quickly determine the capacitor value required for transformerless power supply circuit. A simple transformerless power supply with resistive load can be used if there is a need to connect to the AC mains a load designed for a voltage much less than the mains voltage, for example, a soldering iron. In this circuit a capacitor and resistive load are connected in series to AC mains.

Online Units Converter allows you to convert 10 types of measurement units: Length, Weight, Temperature, Volume, Area, Speed, Time, Pressure and Energy. It is easy to use and is available in English and Spanish.

Voltage Divider Calculator is a simple easy-to-use tool that helps you evaluate the output voltage or resistors values in a single voltage divider according to Ohm's law.

Wire resistance calculator allows you to quickly determine the electrical resistance of a specific wire. The resistance of a wire depends on its material and geometrical dimensions (length and diameter or cross-sectional area).