Basics calculators

Ohm’s law, power, voltage dividers and the fundamental relationships every circuit rests on.

Solve for voltage, current, resistance or power. Get all four values at once, plus the resistor wattage you actually need.

Calculate output voltage, ratio, current and output impedance — with the loading effect built in, not hidden on another page.

Power from any two of voltage, current and resistance — then energy in kWh and what it costs to run.

3 calculators in this category. Every one is free to use on ElectroCalculators, with no account required.