Psychrometric Calculator - Dry-Bulb, Wet-Bulb, RH, Dew Point & Enthalpy (Free)
Why does a glass of iced water "sweat," why does a 30 °C day in Chennai feel unbearable while 30 °C in Jaipur feels fine, and how big a cooling coil do you actually need? Every one of these questions is answered by psychrometrics — the science of moist air. Air isn't just "hot" or "cold"; it carries water vapor, and that moisture controls comfort, condensation and energy use. This free psychrometric calculator lets you enter any two properties — dry-bulb, wet-bulb, relative humidity or dew point — and instantly get all the rest, using validated ASHRAE equations. Figure 1. Any two properties fix a single point on the psychrometric chart — and from that point every other property of the moist air can be read off. This calculator does it numerically. Table of Contents The Psychrometric Calculator What Is Psychrometrics? The 7 Key Properties The Core Equations Why You Need Two Properties Real-World Appli...