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Heat Loss Calculator

Home / Resources / Calculators / Heat Loss Calculator

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
Dimensions
Step 2 of 3



Select top wall
Select left wall Select right wall
Select bottom wall
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
{{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.

My Saved Rooms

NameLength ({{ctrl.getUnitLabel('length', ctrl.selected_units)}})Width ({{ctrl.getUnitLabel('length', ctrl.selected_units)}})Height ({{ctrl.getUnitLabel('length', ctrl.selected_units)}})Room TypeWattsBTUs
{{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