BTU Heating Load Calculator
Create a rough early-stage heating-load placeholder. Final emitter selection requires room-by-room heat-loss design and manufacturer output data at the actual system temperatures.
How to use the BTU Heating Load Calculator
- Enter the room length, width and height in feet.
- Choose the room use, insulation level and glazing type.
- Add the number of exposed walls and other relevant room factors.
- Review the rough planning load in BTU per hour, then obtain a room-by-room heat-loss design.
Why use this tool
- Provides an early BTU/h planning figure from simple room information.
- Uses feet and cubic feet on the US route.
- Makes the need for a complete heat-loss calculation explicit.
This is not a final radiator, baseboard or HVAC equipment selection. A real room-by-room heat-loss calculation needs measured assemblies and thermal values, infiltration and ventilation, local outdoor design temperature and the intended indoor temperature. Select equipment from manufacturer output data at the actual operating conditions and have a qualified HVAC professional verify the complete system.
Part of Builder Tools Calculators — construction tools for US contractors.