Electricity Cost Calculator
Estimate running costs for any appliance, compare multiple devices side by side, and find your biggest energy users — daily, monthly, and annually.
Add your appliances to see which costs the most to run and get a combined total.
Enter your meter readings or known kWh usage to calculate your bill including standing charge.
Tips to cut your electricity costs
Switch off appliances at the wall rather than leaving them on standby. TVs, game consoles, and smart speakers can draw 1–20W continuously when not in use.
Replace old incandescent or halogen bulbs with LEDs. A 9W LED produces the same light as a 60W incandescent — roughly 85% less electricity for the same brightness.
Wash clothes at 30°C instead of 40°C or 60°C. Modern detergents work well at lower temperatures and the heating element uses significantly less energy.
Only boil as much water as you need. Kettles are one of the highest-wattage appliances in the home — overfilling wastes energy every time.
Consider a time-of-use tariff (such as Economy 7 or Octopus Go) if you can shift heavy usage — dishwasher, washing machine, EV charging — to overnight hours where rates can be 60–70% cheaper.
Keep fridge and freezer coils clean and ensure door seals are intact. A fridge with a failing seal or dusty coils can use up to 25% more electricity than necessary.
How it's calculated
All calculations use the standard energy formula:
- Energy (kWh) = (watts ÷ 1000) × hours per day × days × number of units
- Cost = energy (kWh) × rate (p/kWh) ÷ 100
- Bill estimate = unit cost + (standing charge × days) — then VAT applied to the subtotal
Results are estimates. Appliances that cycle on and off (fridges, air conditioners, heated tanks) have a duty cycle less than 100% — for these, use an average or derated power figure rather than the peak rated wattage. Actual bills will also vary by supplier, meter type, and tariff structure.