Our biggest accuracy upgrade yet is here. Ductulator now delivers professional-grade duct sizing and psychrometric results built for real HVAC work. NEW • Mixed Air calculator: combine outdoor and return air, adjust the ratio, and instantly see dry bulb, RH, wet bulb, dew point, enthalpy, moisture, and condensation risk. MAJOR IMPROVEMENTS • Recalibrated round, rectangular, and flexible duct calculations for more dependable pressure-loss results. • Smarter size recommendations with improved friction, velocity, fitting-loss, and flex-compression calculations. • More reliable psychrometrics below freezing and at extremely low humidity. • Clearer result cards, consistent forward and reverse sizing, smoother onboarding, haptic feedback, and a refined launch experience. • Every core calculation has been thoroughly reviewed and reinforced with expanded automated testing. This is Ductulator’s most accurate and polished release yet.

Professional HVAC duct sizing and psychrometric calculations in one powerful app. DuctCalc replaces your physical ductulator with a modern, accurate digital tool trusted by engineers, contractors, and HVAC professionals. DUCT SIZING CALCULATOR Size round, rectangular, and flexible ductwork with ASHRAE-compliant calculations: • Forward Mode: Enter CFM airflow → Get multiple duct size options with velocity, friction loss, and pressure drop for each • Reverse Mode: Select a duct size → See…