# Refrigerant Pressure-Temperature Lookup (R-22 / R-410A / R-134a) Saturated pressure ↔ temperature lookup for common HVAC refrigerants via the Antoine fit ln(P) = A − B/(T_C + C): R-22 (HCFC-22), R-134a (HFC-134a), and R-410A (R-32/R-125 near-azeotropic blend). Coefficients fitted against the ASHRAE Handbook / NIST REFPROP saturation tables. Two modes: solve saturation pressure from temperature, or solve saturation temperature from pressure. Pressure may be absolute or gauge (atmospheric default 1.01325 bar) in bar/MPa/kPa/PSI; temperature in °C/K/°F. Engineering estimate only — does not replace the manufacturer's P-T chart. > Canonical page: https://elysiatools.com/en/tools/refrigerant-pressure-temperature - **Category:** Math & Numbers - **Keywords:** refrigerant, PT chart, pressure-temperature, saturation, R-22, R-134a, R-410A, Antoine, HVAC, condensing, evaporating ## Overview Use this refrigerant pressure-temperature lookup to estimate saturated pressure from temperature or saturated temperature from pressure for R-22, R-134a, and R-410A. Select absolute or gauge pressure and common temperature and pressure units for an engineering estimate. ## Inputs - **Refrigerant** (select): Refrigerant. Coefficients fitted against ASHRAE/NIST saturation tables. - **Input Type** (select): Solve saturation pressure from temperature, or saturation temperature from pressure. - **Temperature** (number): Saturation temperature, in the selected Temperature Unit. Used when Input Type = pressure from temperature. - **Temperature Unit** (select) - **Pressure** (number): Saturation pressure, in the selected Pressure Unit. Used when Input Type = temperature from pressure. - **Pressure Form** (select) - **Pressure Unit** (select) - **Atmospheric Pressure** (number): Local atmospheric pressure in bar (0.5–1.5). Used to convert gauge ↔ absolute. Default 1.01325 bar (sea level). - **Decimal Places** (number) ## When to use - Estimate saturation pressure for a known evaporating or condensing temperature. - Estimate saturation temperature from a measured refrigerant pressure. - Convert refrigerant pressure readings between gauge and absolute values using atmospheric pressure. ## How it works - Select R-22, R-134a, or R-410A. - Choose whether to solve pressure from temperature or temperature from pressure. - Enter the value and select the temperature, pressure form, and pressure units. - The calculator applies an Antoine fit and returns the saturation result with converted pressure or temperature values. ## Use cases - Check expected evaporating or condensing pressure during HVAC service calculations. - Estimate saturation temperature from a gauge reading taken in PSI or another supported pressure unit. - Compare refrigerant pressure-temperature conditions using consistent absolute or gauge pressure values. ## Frequently asked questions ### Which refrigerants are supported? The tool supports R-22, R-134a, and R-410A. ### Can I calculate pressure from temperature? Yes. Select "Solve pressure from temperature," then enter a temperature in °C, K, or °F. ### Can I calculate temperature from pressure? Yes. Select "Solve temperature from pressure," then enter pressure in bar, MPa, kPa, or PSI. ### What is the difference between absolute and gauge pressure? Absolute pressure is referenced to a vacuum. Gauge pressure is referenced to local atmospheric pressure, which defaults to 1.01325 bar. ### Is this a replacement for a refrigerant P-T chart? 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