Electricity Calculators

Electric motors, household appliances and heating systems all draw power, and what they actually cost to run is rarely obvious from the nameplate. These calculators turn the numbers you already have — voltage, current, wattage, hours of use, the price per kilowatt-hour — into an answer you can act on. Some solve the underlying physics, like Ohm's law and Watt's law. Others estimate what a single device adds to the bill over a month or a year. All of them show the formula next to the result, so you can check the working rather than take it on trust.