Calculate Comfort
Psychrometer ℃alc
Only for iPhone
Free · In‑App Purchases · Designed for iPhone
iPhone
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.
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.
■ Calculation Specs
Saturated Vapor Pressure: Sonntag formula
Vapor Pressure: JIS Z 8806
Relative Humidity: WMO standard (denominator = vapor pressure of supercooled water)
■ 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.
Fixed an issue that allowed out-of-range values on the atmospheric pressure input screen.
Adjusted font sizes to improve readability.
Optimized the keyboard.
Added multilingual support.
The developer, JUN KANAYAMA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- JUN KANAYAMA
- Size
- 10.6 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.6 or later.
- Languages
English and 14 more
- English, French, German, Indonesian, Italian, Japanese, Korean, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- This app has an age rating of 4+ with content restrictions. Some content may be rated higher, but access is managed by the developer through in-app controls.
- In-App Controls
Age Assurance
Parental Controls
Contains
Advertising
- In-App Purchases
Yes
- Pro Version $3.99
- Copyright
- ©︎2025 Jun Kanayama
