°C
Heating calculators
Size radiators and heat pumps, estimate running costs, and plan a warm home. Every calculator updates live and works in metric or imperial.
Most used
Radiator BTU
Work out the heat output needed to warm a room. Enter dimensions and property details for a live ΔT50 result in watts, kW, and BTU.
Heat Pump Running Cost Calculator
Estimate what an air source heat pump costs to run in a UK home, and compare it with your current gas, oil, LPG or electric heating using current energy prices and SCOP.