Calculate Comfort
iOS app by JUN KANAYAMA. Productivity · JUN KANAYAMA
- Store rating
- 3.86 / 5
- Store rating count
- 35
- Download price
- Free to download
- In-app purchases
- Unknown
- Version
- 5.7
- Listing last refreshed
- 2026-09-10
View the original store listing
Store description excerpt
Calculate Comfort computes the psychrometric properties of moist air — dew point, wet bulb temperature, absolute humidity, enthalpy and more — from temperature and humidity. Turn a dial instead of reading a psychrometric chart. Built for HVAC design, instrumentation, building maintenance and condensation control. Units: the Pro version switches the entire readout between IP and SI in one tap, °F⇄°C included. Useful when your measurements are in IP but the equipment data is in SI. If you work only in Fahrenheit, our companion app Psychrometer °F opens in Fahrenheit by default. ■ Who it's for ・HVAC engineers and contractors who need moist-air properties on site ・Technicians converting psychrometer readings to relative humidity ・Anyone assessing condensation or mold risk from dew point ・Students learning to read a psychrometric chart ■ What it calculates Enter temperature plus relative humidity, dew point or wet bulb temperature: ・Relative humidity (%RH) ・Dew point (°C DP) / frost point (°C FP), switchable below 0 °C ・Wet-bulb temperature (°C WB) ・Mixing ratio, gravimetric absolute humidity (g/kg) ・Absolute humidity, volumetric (g/m³) ・Enthalpy (kJ/kg), for load calculations ・Specific volume (m³/kg) ・Vapor pressure and saturated vapor pressure (hPa) ・Discomfort index (DI) ・Estimated WBGT heat index (indoor, no solar load) ・Comfort indicator (18–28 °C, 40–70 % RH) ■ Main features ◯ Three input modes: relative humidity, dew point or wet bulb temperature. Tap the % icon to switch; keyboard entry also available. ◯ Works in place of a psychrometric chart. Dew point mode traces constant absolute humidity — sensible heating and cooling. Wet bulb mode traces the constant wet-bulb line — humidification and dehumidification. ◯ Three psychrometer types: aspirated (Assmann), wall-mounted (August) and sling. Below freezing you can set whether the wet bulb is iced; below −10 °C this applies automatically, except for the sling type. ◯ Pressure-corrected calculation: standard pressure (1013.25 hPa), built-in barometer, weather data or manual entry (800–1200 hPa). ◯ Automatic weather retrieval from your location, with a recommended indoor temperature (ASHRAE Standard 55). Choose OpenWeatherMap or Apple Weather. ◯ Works offline. A connection and location permission are needed only to fetch outdoor weather. ◯ Comfort indicator in color and emoji. [Common gestures] ・Pressure and index readouts: tap to open settings ・Outdoor air (weather icon), dew point input, wet bulb input and reset buttons: touch and hold to open settings ■ Pro version (one-time in-app purchase) ・Removes all ads ・IP ⇄ SI unit switching in one tap: °C⇄°F, g/kg⇄gr/lb, g/m³⇄gr/ft³, kJ/kg⇄BTU/lb, m³/kg⇄ft³/lb, hPa⇄inHg ・Text export of calculation results ・Extended pressure input: 23–36 inHg ・Selectable saturation vapor pressure formula: Sonntag (WMO), Hyland-Wexler (ASHRAE), Wagner-Pruß (IAPWS-95), Goff-Gratch, Magnus-Tetens ■ Supported devices iPhone with iOS 16.0 or later. Also runs on Apple M1
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