AirFlow ProCalc

AirFlow ProCalc is the ultimate duct sizing tool for HVAC professionals. Whether you’re in the field or at the desk, this app makes duct calculations fast, accurate, and easy. Designed by HVAC techs for HVAC techs, AirFlow ProCalc helps you size round and rectangular ducts instantly, with real-time updates to airflow, velocity, and friction loss as you adjust. You can even toggle between smooth metal and internally lined ducts for accurate results in any scenario. Features: Automatic duct sizing for round & rectangular ducts Real-time velocity & static loss calculations Manual size adjustments with instant recalculation Smooth metal or internally lined duct options CFM, velocity, or static loss–based sizing Clean, easy-to-use interface that works great in the field Perfect for load calculations, system design, and quick checks on service calls—AirFlow ProCalc saves you time and ensures precision every time.