Heating and energy calculators

Size radiators properly, check how well a wall or loft is insulated, and see what solar panels or a heat pump might mean for you.

Which tool do I need?

BTU calculatorWork out how many BTU per hour a room needs to stay warm on a cold day.
New boiler cost calculatorWork out what a new gas boiler costs, fitted, in your part of the UK.
U-value calculatorWork out the U-value of a wall, roof or floor from the layers it is made of.
Radiator size calculatorWork out the radiator size you need for a room, in BTU/h and watts.
Solar panel calculatorWork out how many solar panels you need, how big the system is in kWp, how much roof it takes and how much electricity it should make in a year.
Energy bill calculatorWork out your gas and electricity bill from how many kWh you use, at the current Ofgem price cap unit rates and standing charges.
Insulation calculatorWork out how much insulation you need.
Heat pump cost calculatorWork out what a heat pump might cost in the UK.