Refrigerant and charging calculators
Refrigerant saturation pressures and temperatures, superheat and subcooling, and leak-rate arithmetic — from validated property tables, always deferring to the manufacturer’s charging procedure.
Refrigerant Pressure–Temperature (PT) Calculator
Saturation pressure at a temperature, or saturation temperature at a gauge reading, for R-410A, R-32, R-22 and R-134a — with bubble and dew points, temperature glide and an altitude correction.
Answers: What pressure should R-410A (or R-32, R-22, R-134a) be at this temperature?
Superheat and Subcooling Calculator
Superheat from suction pressure and suction-line temperature, or subcooling from liquid pressure and liquid-line temperature, compared with the manufacturer’s target.
Answers: How do I calculate superheat and subcooling from my gauge readings?
Refrigerant Leak Rate Calculator (EPA Annualizing Method)
Annualized refrigerant leak rate from the pounds added, the full charge and the days since the last addition, compared with the EPA repair threshold for the appliance type.
Answers: What is my refrigerant leak rate, and does it exceed the EPA threshold?
Validated property data, manufacturer procedures
These tools turn gauge and thermometer readings into saturation temperatures, superheat and subcooling, and turn refrigerant additions into an EPA leak rate. The refrigerant tables are generated with an open-source property library and only published once they agree with independent tables — see the Refrigerant PT charts page for the comparison. The charging method, target and tolerance always come from the equipment manufacturer, and only certified technicians may handle refrigerant.