About the Energy Cost Calculator
Understanding how much your appliances cost to run helps you manage your energy bills and identify opportunities to save. This calculator converts the power rating (watts) and usage time into the actual cost based on the current UK energy price cap.
How to use this calculator
Enter the appliance's power rating in watts (usually printed on the back or in the manual), how many hours per day you use it, and the calculator will show the cost per hour, day, week, month, and year. Use the preset buttons for common household appliances.
Tips for reducing energy costs
- Switch to LED bulbs they use up to 90% less energy than incandescent bulbs.
- Wash clothes at 30C and use eco settings where available.
- Air-dry clothes instead of using a tumble dryer when possible.
- Turn off appliances at the plug rather than leaving them on standby.
- Use a smart thermostat to optimise heating schedules.
- Compare energy tariffs regularly to ensure you are on the best deal.
Understanding the Energy Price Cap
The Ofgem price cap limits how much energy suppliers can charge per kWh of electricity and per day for the standing charge. As of April 2025, the typical rate is about 27.0p per kWh for electricity with a standing charge of 53.5p per day. These rates are updated every three months.
Frequently asked questions
What does kWh mean?
A kilowatt-hour (kWh) is a unit of energy. 1 kWh is the energy used by a 1000W appliance running for one hour. Your electricity bill charges you per kWh used.
What is a standing charge?
The standing charge is a fixed daily amount you pay to be connected to the energy grid, regardless of how much energy you use. It covers maintenance, meter readings, and network costs.
How can I find my appliance wattage?
Check the rating plate on the appliance (usually on the back, bottom, or door frame). It will show the power in watts (W) or kilowatts (kW). 1 kW = 1000W.