Heat Loss Calculator

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Calculate your heat requirements in three simple steps. Save each room, download a PDF report or export a CSV.

Room Basics
Step 1 of 3

Your preferred units	Metric Imperial
Room name
State avg. outside temp.
Type of room {{room.name}}

Dimensions
Step 2 of 3

Height ({{ctrl.getUnitLabel('length', ctrl.selected_units)}})

Width ({{ctrl.getUnitLabel('length', ctrl.selected_units)}})

Length ({{ctrl.getUnitLabel('length', ctrl.selected_units)}})

	Select top wall
Select left wall		Select right wall
	Select bottom wall

Number of external walls

Total area of windows (sq. {{ctrl.getUnitLabel('length', ctrl.selected_units)}}.)

Measure the area of a window by multiplying the width by the height in {{ctrl.getUnitLabel('length', ctrl.selected_units)}}.
Use the sum of all windows if there are more than one.

Construction Materials
Step 3 of 3

What is above the room?
What is below the room?
Type of external walls {{wall.name}}
Type of windows

{{ctrl.calc.watts}} Watts ({{ctrl.calc.btus}} BTUs) Result

{{ctrl.calc.name !='' ? ctrl.calc.name : ctrl.calc.room_type_name}} requires approximately {{ctrl.calc.watts}} Watts ({{ctrl.calc.btus}} BTUs) according to the parameters you’ve entered. This is a MARC-approved calculation and includes a 20% safety margin.

Download as CSV or Print PDF

My Saved Rooms

Name	Length ({{ctrl.getUnitLabel('length', ctrl.selected_units)}})	Width ({{ctrl.getUnitLabel('length', ctrl.selected_units)}})	Height ({{ctrl.getUnitLabel('length', ctrl.selected_units)}})	Room Type	Watts	BTUs
{{room.name}}	{{room.depth}}	{{room.width}}	{{room.height}}	{{room.room_type_name}}	{{room.watts}}	{{room.btus}}	Remove
Total	{{ctrl.totalWatts()}}	{{ctrl.totalBtus()}}

Download as CSV Print PDF