DuctCalc - HVAC Ductulator

Size and check HVAC ductwork with guided steps made for installers, sheet-metal workers, and residential designers. DuctCalc works on iPhone and iPad, and its calculators work without an internet connection. SIZE DUCTWORK Enter airflow, then size by design friction or target velocity. Review the exact diameter, recommended standard round size, velocity, friction, and nearby round options. Select up to three rectangular heights for equivalent sizes, set fabrication width increments, and apply a configurable flex-duct factor when your design calls for one. CHECK AN EXISTING DUCT Choose round, rectangular, or flat oval. Use known airflow to calculate velocity and friction, or use known velocity to calculate airflow. Add an optional run length to estimate total friction loss. Results also include velocity pressure. CONVERT DUCT SHAPES AND UNITS Calculate equivalent round and rectangular…