Heating Calculators
Single-purpose tools for planning the heating in a UK home. Every page shows the formula and a worked example.
Heat Loss Calculator
Room-by-room heat loss in watts and BTU at your area's design temperature
Open CalculatorRadiator Size Calculator
The radiator output to buy for a room, corrected for your flow temperature
Open CalculatorBoiler Size Calculator
Heating load and, for a combi, the hot water flow that sets its size
Open CalculatorHeat Pump Size Calculator
Design heat load at your local design temperature and the nearest headline unit sizes to check
Open CalculatorHeat Pump Cost Calculator
What a heat pump costs to install by size, from official grant statistics, and what is left after the grant
Open CalculatorHeat Pump vs Gas Running Cost Calculator
Annual running cost of a heat pump against a gas boiler at the Oct to Dec 2026 price cap
Open CalculatorBoiler Upgrade Scheme Eligibility Checker
Check whether your home qualifies for the Boiler Upgrade Scheme grant, and how much
Open Calculator
Heating Planner
Free UK home heating tools
Tools
Resources
More Calculators
- Electrical Calculators AC wiring, voltage drop and cable sizing tools
- Flow Rate Calculator Pump, pipe and flow rate tools
- Solar Sizing Calculator Solar, plug-in solar and battery sizing tools
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