Energy and household cost calculators

Eight calculators for the bills and decisions that matter most in a European home. Each one shows its formula, explains its assumptions and runs entirely in your browser.

• Appliance running cost calculator

  Turn a wattage label into a cost per hour, day, month and year at your own electricity price.

• Electricity bill calculator

  Turn your kWh, unit rate and standing charge into a monthly and yearly bill and your true price per kWh.

• EV charging cost calculator

  Price any charge from the socket, see the range it adds, the cost per 100 km and the time it takes.

• EV vs petrol cost calculator

  Compare a year of electric driving with petrol or diesel and see when the extra purchase price pays back.

• Gas m3 to kWh calculator

  Convert cubic metres or hundreds of cubic feet from your gas meter into kWh, using the factors on your bill.

• Heat pump vs gas boiler calculator

  Compare yearly running costs, find the break-even efficiency and see how long a heat pump takes to pay back.

• LED savings calculator

  See what swapping halogen or incandescent bulbs for LEDs saves each year and how fast the new bulbs pay back.

• Solar panel payback calculator

  Estimate how many years a rooftop system takes to pay back and what it earns over 25 years.