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Advanced Calculator

Home / Resources / Heat Loss Calculators / Advanced Calculator

A more in-depth, fully customisable heat loss calculator.

1. General information about the room
Enter room name
Preferred room temperature
External winter temperature
2. Heat loss through ventilation

How draughty is the room?

Draughtier rooms lose more heat through air changes than well sealed rooms. The number of air changes is the number of times the air in a room is completely renewed through draughts every hour. Older houses tend to be draughtier than modern houses.

Room usage also affects draughtiness.
Here’s a general guide:

  • Select Draughty for hallways and kitchens.
  • Select Average for living rooms.
  • Select Not draughty for bedrooms and bathrooms.
3. Heat transfer through the walls
4. Heat transfer through the floor & ceiling
5. Results
Form incomplete
Ventilation heat loss:0 Watts (0 BTUs)
Fabric heat loss:0 Watts (0 BTUs)
Total heat loss:0 Watts (0 BTUs)