Electricity & Power Cut Calculators
Size a generator or battery backup for the next power cut, estimate your electricity bill and see what your appliances cost to run.
- Electricity Bill Calculator Pick your region, enter the kWh you used and get an estimated electricity bill from the Ofgem price cap unit rate and standing charge.
- Home Energy Use Calculator Estimate monthly kWh and cost from common household appliances and your own devices.
- Generator Size Calculator Add the appliances you need during a power cut and find the running and starting watts your generator must supply (230 V).
- Battery Backup Runtime Calculator How long a portable power station, UPS or home battery will run your devices during a power cut.
- Air Conditioner Running Cost Calculator Estimate portable, split or heat-pump air conditioner energy use and monthly cost from kW, efficiency and hours.
- Electric Heater Cost Calculator Calculate what an electric heater costs to run per hour, day and month at your unit rate.
- Immersion Heater & Electric Shower Cost Calculator Estimate the electricity an immersion heater, hot-water cylinder or electric shower uses each month.
- EV Charging Cost Calculator Estimate the cost of charging an electric vehicle at home per charge, per mile and per month.
- Solar Savings Calculator Estimate rooftop solar production, bill savings, Smart Export Guarantee income and payback time.
- Electricity Bill to kWh Calculator Work out roughly how many kilowatt-hours a bill amount represents after the standing charge.
- Electricity Price Cap by Region Compare the Ofgem price cap unit rate and standing charge in every region.
Regional electricity bill calculators
- London
- South East England
- South West England
- East of England
- East Midlands
- West Midlands
- Yorkshire and the Humber
- North West England
- North East England
- Wales
- Scotland
- Northern Ireland
Channel Islands & Isle of Man
Recent reports across the UK
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Questions about bills, generators & backup power?
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