Psychrometric Drying Calc

Psychrometric calculator: calculate air properties from entered dry-bulb temperature, relative humidity and 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.

Alongside HVAC Psychrometric, use this separate psychrometric calculator for an educational air-state worksheet based on measurements you enter manually. Write down the observation context before interpreting the figures, and keep any building-condition or equipment decision outside this calculation exercise.

Recent changes:
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.