Calculate Comfort

This app calculates comfort levels by evaluating heat, cold, dryness, and moisture.
You can easily adjust values using a dial. Results are visually displayed using color and emoji indicators.
By inputting temperature and humidity, dew point, or wet-bulb temperature, the app calculates the following air conditions:
Relative Humidity (%RH)
Dew Point / Frost Point Temperature (°C DP / °C FP)
Wet-Bulb Temperature (°C WB)
Mixing Ratio (g/kg)
Absolute Humidity (g/m³)
Enthalpy (kJ/kg)
Specific Volume (m³/kg)
Vapor Pressure (hPa)
Saturated Vapor Pressure (hPa)
Discomfort Index (DI)
Wet-Bulb Globe Temperature (WBGT)
Comfort Indicator (18–28°C, 40–70% humidity)
When within the comfort range, a visual indicator using color or emoji will appear.
■ Main Features
Index Toggle (DI / WBGT)
Tap the DI section to switch between Discomfort Index and WBGT.
Atmospheric Pressure Input
Tap the pressure icon to select from:
Standard (1013.25 hPa)
Sensor (reads from internal barometer)
Weather Data (auto-fetched)
Manual Entry (800–1200 hPa, or 23–36 inHg with Pro)
Input Switching (% Icon)
Switch between relative humidity, dew point, or wet-bulb temperature.
In dew point mode, long-press to choose between dew point (condensation) and frost point (ice).
In wet-bulb mode, long-press to select psychrometer type:
　・Assmann (ventilated, high accuracy)
　・August (non-ventilated, simple)
　・Sling (manual rotation)
When below 0°C, a freeze switch appears (automatic freeze below -10°C for Sling type). You can toggle freezing manually to match actual conditions.
Weather Auto-Fetch (Weather Icon)
Uses location to retrieve temperature and humidity from weather data.
Displays the comfort temperature screen. Shows the recommended indoor temperature based on the outside temperature.
Long-press to choose the provider: OpenWeatherMap or Apple Weather.

Reset (Circular Arrow Icon)
Restores default values (set in settings). Psychrometer resets to Assmann.
Long-press to set your own default temperature/humidity.
Info (i Icon)
Opens help and purchase screen.
– Pro Version Features –
Unlock the following:
・Ad Removal
Removes all ads.
・Unit Conversion
Switch between SI and US units:
　°C ↔ °F
　g/kg ↔ gr/lb
　g/m³ ↔ gr/ft³
　kJ/kg ↔ BTU/lb
　m³/kg ↔ ft³/lb
　hPa ↔ inHg
・Export Function
Export calculation results as text.
Selectable saturation vapour pressure formulas (in normal use the results differ very little; they were built in for development verification)
• Sonntag: high-accuracy formula adopted by the WMO. Range -65°C~100°C
• Hyland-Wexler: high-accuracy formula recognised by ASHRAE. Range -100°C~100°C
• Wagner-Pruss: highest-accuracy formula based on IAPWS-95, for scientific research. Range -123°C~374°C (sublimation zone – critical point)
• Goff-Gratch: standard formula long used in meteorology. Range -100°C~100°C
• Magnus-Tetens: approximation widely used in meteorology. Range -50°C~50°C
■ Calculation Specs
Saturated Vapor Pressure: Sonntag formula
Vapor Pressure: JIS Z 8806
Relative Humidity: WMO standard (denominator = vapor pressure of supercooled water)
Enthalpy: ASHRAE
■ Notes
Extreme inputs may cause errors.
Values may slightly vary due to rounding and internal conversion.
While accuracy is a priority, results are not guaranteed. The developer is not liable for any damage caused by app usage.