Electricity cost calculator

See how much a sauna, heater, kettle or electric car really costs per month.

W
h/day
days
€/kWh
Cost per month€9.00

Shopping list

  • Cost per year€108

How we got there

Energy per day
2 kWh
Energy per month
60 kWh
Energy per year
720 kWh

Results are estimates. Always check the consumption printed on the product you buy.

How it is calculated

Energy in kilowatt-hours is power in watts × hours of use ÷ 1,000. Multiplying by the number of days gives the monthly use, and multiplying by your price per kWh gives the cost. Use the full price from your bill, including transfer and taxes, for a realistic result.

FormulakWh per day = power (W) × hours ÷ 1,000Cost per month = kWh per day × days × price per kWh

Example

A 2 kW kettle used for one hour a day uses 60 kWh a month. At 0.15 € per kWh that is 9 € a month, or 108 € a year.

Tips from practice

  • Heaters and saunas run at full power only part of the time; the thermostat switches them on and off.
  • With a spot-price contract, running heavy appliances at night can cut the cost noticeably.
  • The power is printed on the appliance label in watts (W) or kilowatts (kW).

Questions and answers

How much does a sauna cost per session?

A 6 kW heater used for about 1.5 hours uses roughly 6–9 kWh, depending on how long the thermostat keeps it on.

What price should I enter?

Divide the total of your last bill by the kWh used. That includes energy, transfer and taxes.

How do I find the power of an appliance?

Look at the label on the back or bottom, or in the manual. 1 kW = 1,000 W.

Found a mistake in a formula? Write to [email protected]