Tools

Ohm's Law Calculator

Calculate the voltage, current, or resistance of a circuit

LED Resistor Calculator

Calculate the resistor needed for an LED in a circuit

DC Power Calculator

Calculate the power consumption of a DC circuit

Battery Life Calculator

Calculate the length of time you can run a circuit from a battery

Resistor Colour Calculator

Work out a resistor value from the coloured bands

Electronics Tools

Welcome to our suite of free online electronics tools. Here we have an array of different handy tools, from calculators to interactive charts.

We have created calculators for some of the most common formulas, including an Ohm's Law Calculator and LED Resistor Calculator.