Electrical Calculators

Choose the right calculator

Calculate electrical quantities, energy, resistance, speed, and motion from your inputs.

Ohms Law Calculator

Calculate voltage, current, or resistance from the other two values and show the associated electrical power.

Electrical Power Calculator

Calculate active power, voltage, or current in DC, single-phase, or balanced three-phase systems using your chosen power factor.

Series Parallel Resistor Calculator

Calculate the equivalent resistance of 2 to 20 resistors in series or parallel on one page.

Watt Hour Calculator

Calculate energy in Wh and kWh from power and time, convert energy units, or estimate battery capacity and runtime from entered values.

Speed Distance Time Calculator

Calculate average speed, distance, or time using the available metric units: m, km, m/s, km/h, seconds, minutes, and hours.

Kinetic Energy Calculator

Calculate kinetic, potential, or combined mechanical energy in joules using mass, speed, height, and the entered gravity.

Voltage Drop Calculator

Estimate voltage drop for an entered one-way conductor run. Select AWG or mm² as an input to the same calculation. This page does not choose a wire size or certify electrical-code compliance.