P-T Calculator

P-T Calculator by National Refrigerants offers a comprehensive HVAC/R pressure/temperature calculator. It computes pressure/temperature relationships or superheat/subcool values, updating automatically as you input pressure or temperature; for refrigerant blends, both saturated vapor and saturated liquid data are shown. A blended display on the superheat/subcool screen visualizes entering, midpoint, and outlet temperatures.

Extras include automatic altitude correction if location services are enabled, English/Metric units, a Favorites refrigerants list, and quick links to NRI resources (Lubricant Cross Reference, Branch Locator).