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Superheat, subcooling, airflow, PT chart and charge tools for HVAC techs.
HVACR Charge Calculator is the free offline toolkit for HVAC technicians. Calculate superheat, subcooling, airflow, refrigerant charge and duct size right on the job, with a built-in PT chart covering 17 refrigerants. KEY FEATURES Superheat Calculator Actual and target superheat with smart diagnosis. Know instantly if the charge, airflow or restriction needs attention. Subcooling Calculator TXV charge check with bubble point accuracy and high/low alerts. Airflow Calculator CFM by TESP, room size or area, using the 400 CFM per ton rule. PT Chart Pressure-temperature charts for 17 refrigerants including R410A, R32, R454B, R22 and more, with bubble and dew point. Charge Calculator Line set weigh-in charge for residential, heat pump and other systems. Duct Sizer Round and rectangular duct sizing by equal friction. Unit Converter Temperature, pressure, length and more, in imperial and metric. Saved Results Save every calculation, filter by tool, and share with one tap. WHY TECHNICIANS CHOOSE IT - 100% offline, works without internet - No login, no account needed - No ads - English and Spanish - Imperial and metric units - Clean, fast, professional design Whether you service residential AC, heat pumps or commercial refrigeration, HVACR Charge Calculator puts the essential charging tools in your pocket.