Our calculators
All Wisiko calculators: appliance running cost, watts to amps, concrete, paint and data tables. Free, no sign-up.
Appliance running cost calculator
Enter an appliance's wattage and daily use to get kWh and running cost per hour, day, month and year, using current US, UK or European electricity prices or your own rate.
CalculatorConcrete calculator (slabs, footings, post holes)
Work out how much concrete you need for a slab, footing or round post hole, with a waste allowance, in cubic yards or cubic meters, plus the number of 80 lb or 60 lb bags.
CalculatorPaint calculator for a room
Enter room size, doors, windows, coats and coverage to get the wall area, gallons (or liters) of paint needed and the cans to buy.
CalculatorWatts to amps calculator
Convert watts to amps or amps to watts for 120 V, 230 V, 240 V or three-phase supplies, and work out energy use in kWh. Formulas and worked examples.
DataHow much electricity appliances really use: measured data
Median annual kWh for 36 household appliances, measured every 10 minutes in 100 homes (ADEME, 2023–2024): water heaters, fridges, routers, TVs, washers and more, with running costs.
DataElectricity prices in Europe: country ranking
Average household electricity price per kWh in every EU country plus Norway and Liechtenstein, including all taxes, from Eurostat. Which countries pay the most and the least?