Psychrometric & Paint Calculator. Psychrometric Calculator (Both Metric & British Units): To calculate WetBulb Temperature, Relative Humidity, Dew Point, Atmospheric Pressure, Saturated Vapour Pressure, Partial Vapour Pressure, Humidity Ratio, Enthalpy, and Specific Volume. Paint Calculator: To calculate Dry Film Thickness, Wet Film Thickness, Solid by Volume, Consumption Rate & Cost.Ship Surface CalculatorTo estimate surface areas of ships in sqm as per Lloyds.