Overall UA Value Calculator

Calculate overall heat transfer coefficient times area (UA) for building envelope assemblies. Used in heat loss/gain calculations.

Gross wall area.
ft²
Wall assembly U-factor.
BTU/hr·ft²·°F
Total window area.
ft²
Window U-factor.
BTU/hr·ft²·°F
Roof area.
ft²
Roof assembly U-factor.
BTU/hr·ft²·°F

Results

Wall UA-BTU/hr·°F
Window UA-BTU/hr·°F
Roof UA-BTU/hr·°F
Total UA-BTU/hr·°F
References: ASHRAE Fundamentals Chapter 18: Nonresidential Cooling and Heating Load Calculations; ASHRAE Standard 90.1