Psychrometric Drying Calc

PatchMedia

In-app purchases

About this app

Calculate air properties from the values you enter: dry-bulb temperature, relative humidity and air pressure. Psychrometric Drying Calc calculates dew point, humidity ratio, grains per pound of dry air, vapor pressure and moist-air enthalpy on your device. The calculator works offline and shows units, supported input limits and the correlation used.

The free calculator is ready on first open. Enter your measurements, switch between °C and °F or kPa and inHg, and review the result. Changing an input clears the previous result so it cannot be mistaken for a current calculation.

Optional Lifetime Pro adds a local field-case library, case search and reopening, A/B differences, and user-entered load/rate/time scenarios. A scenario shows the arithmetic remainder from your own inputs; it does not predict field performance or a completion time. Pro also adds plain-text reports and CSV case export. Free includes versioned JSON backup and import to move your own saved cases and scenarios through Android's document picker.

Your measurements and saved cases stay in app-private storage during normal use. There is no PatchMedia account, advertising or cloud sync. Export and import happen only when you choose a file destination. Google Play handles the optional one-time purchase and restoration.

This app provides educational calculations for measured air states. It does not select equipment, assess building safety or mold, certify conditions, or provide professional guidance. Verify critical decisions with qualified methods.

What’s new

First release: offline air-state calculator with explicit units and formula version. Optional Lifetime Pro adds saved cases, A/B comparison, user-entered rate scenarios, and text/CSV export. JSON backup is user-controlled.