Designed For
Hvac technicians, installers, apprentices, and light-commercial service teams.
Included Calculators
- Round duct sizing
- Rectangular duct conversion
- Airflow and sensible heat
- Air velocity
- Superheat and subcooling
SiteCalc
SiteCalc: HVAC Duct Calc
HVAC field calculators for duct sizing, rectangular equivalent diameter, airflow, velocity, superheat, subcooling, and PT reference.
Calculation Workflow
Enter valuesUse field units and project conditions.
Review resultCheck the calculated output and assumptions.
Verify externallyConfirm against official sources where the work is regulated or safety critical.