Duct sizing
Round and rectangular ductulator by friction rate or velocity.
iPhone · iPad · HVAC/R
HVAC Calculator & Ductulator
Duct sizing, superheat and subcooling, airflow and load in seconds. Built for the field: every calculator works offline.
Superheat & subcooling
PT data for six refrigerants, including R-32 and R-454B.
Airflow & load
Temperature-rise CFM, CFM/ton checks and a quick load estimate.
Jobs & PDFs
Save calculations to jobs and share PDF reports. Works offline.