What this heating cost calculator asks for
To keep the tool easy to use, it works from whole-home assumptions rather than requiring room-by-room heat-loss calculations. You enter your approximate heated floor area, property type, insulation level, glazing quality, draughtiness, UK region, target indoor temperature, heating hours per day, heating season length and the heating system you use.
Do you need to do it room by room?
Not for this version. A full room-by-room model is more accurate, but it makes the tool much slower to use. For most homeowners, a whole-property estimate is the better compromise when you want a practical budget figure.
Do radiator numbers, towel rails or exact window sizes matter?
They matter less than many people think for a quick cost estimate. Radiators and towel rails affect how heat is delivered, but the bill is driven mainly by the home's heat demand and the efficiency of the heating system. Instead of exact window dimensions, this tool uses glazing quality and draughtiness as simpler proxies.
What this estimate includes
- Space heating only, not hot water.
- System efficiency or heat pump COP so fuel purchase is adjusted for how effectively heat is produced.
- Regional winter temperature assumptions to reflect the fact that colder parts of the UK usually cost more to heat.
Important note
This is a planning estimate, not a replacement for a professional heat-loss survey or a supplier bill. Real results vary with weather, thermostat habits, room zoning, hot water demand, occupancy, solar gains and the condition of the property.