Electricity use
What an appliance costs per month and per year based on hours of use.
Engineering calculators
Ohm’s law, electrical power, consumption, voltage drop and cable sizing.
Tools in this category
Ohm’s law
Enter two of voltage, current or resistance and get the third.
Electrical power
Active and apparent power for single and three phase installations.
Engineering
Basic electrical tools aimed at installers, students and DIY enthusiasts.
Conductor calculations use the resistivity of copper and aluminium at 20 °C. For real projects, always check the electrical code that applies in your country.