Room Heating Calculator
Use our room heating calculator to determine the most efficient and economical way to heat a large enclosed area.
The Room Heating Calculator is designed to be an approximate sizing guide for determining heat loss from a room. The Wizard will determine a total heat loss value based on your specific room data. The resulting value can then be used for specifying the appropriate Chromalox comfort heater for your heating needs.
*Use the R-Factor Reference to lookup common material R-Factor values. Important: R-Factor values are additive. For example, 2" of softwood results in an R-Factor of 2 x 1.25 = 2.5.
*For floor perimeter use U-factor of 1.2 for 1" insulation or 0.7 for 2" insulation.
Design Temperature Reference
Total Heating Requirement
Conversion to Watts
Total BTU / Hr / 3.412 BTU per watt =
Total Watts per hour
Select a Comfort Heater