HumidCalc Downloads & RevenueHumidCalc · App Store
湿度の計算
Not in any tracked top chart right now.
Updated 1 Nov 2026 · rankings refresh through the day
Developeryoshihito sakagami
CategoryWeather
PriceFree
Released
Rating★ 3.2 (15)
Version1.2.8
Age rating4+
First seen by us
6 Oct 2026
6 Oct 2026🆕First spotted by AppInsider📈Dropped out of every chart we track📦Version 1.2.8🆕Released on the App Store
Full timeline · 4 events
- 🆕HumidCalc first spotted by AppInsider#84 in Top Free · Weather · Japan
- 📈HumidCalc dropped out of every chart we trackLast seen 5 Oct
- 📦HumidCalc version 1.2.8- Added "Auxiliary Input Mode," allowing numeric input for Dew Point Temperature and Relative Humidity.
In addition to the standard input ("Atmospheric Pressure × Dry-Bulb Temperature × Wet-Bulb Temperature"), you can now enter values using two distinct modes:
• Atmospheric Pressure × Dry-Bulb Temperature × Dew Point Temperature
• Atmospheric Pressure × Dry-Bulb Temperature × Relative Humidity
- Added Pictogram Indicators next to the WBGT (Estimated Value) and Discomfort Index numbers to help you visually check heatstroke risk and mugginess.
(For pictogram types and threshold values, please check the 9th and 10th screenshots.)
- Updated the ad format from standard Adaptive Banners to Collapsible Banners.
[Important: How to use the new "Auxiliary Input Mode" & Tip]
While this update adds support for Relative Humidity and Dew Point inputs, this app is designed to prioritize calculation based on the "Dry-Bulb Temperature × Wet-Bulb Temperature" combination.
Therefore, changes in the Dry-Bulb or Wet-Bulb temperatures will automatically update and recalculate the Dew Point and Relative Humidity values accordingly.
● Tip for accurate input:
Always enter and set the Dry-Bulb Temperature first.
If you change the Dry-Bulb Temperature later, any previously entered Relative Humidity or Dew Point values will be automatically recalculated to match the new temperature.
For a smooth experience, we recommend entering values from top to bottom, starting with Atmospheric Pressure!… more - 🆕HumidCalc released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
3.2 ★
15 ratings
Measured
HumidCalc on the App Store
App details
App ID
1135328698
Publisher
yoshihito sakagami
On the store since
Jul 2016
10 years on the store
Minimum OS
iOS 15.6+
iPhone 6s and later
Devices
iPhone · iPad
Content rating
4+
Languages
3
EN JA ZH
Size
12 MB
Also listed in
Utilities
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
3.2 ★
15 ratings
Measured
Ratings
15
Measured
About HumidCalc
＊Weather data supported＊
A versatile humidity calculation app for everyone from general users to engineers — also suitable for agricultural applications.
This app allows you to easily calculate indicators such as the Discomfort Index, WBGT (estimated heat stress index), Volumetric Absolute Humidity (an important indicator for influenza prevention), and Humidity Deficit (HD) used in agriculture, using weather data.
You can also calculate a wide range of air properties from dry-bulb temperature (normal air temperature) and wet-bulb temperature obtained from ventilated psychrometers such as the Assmann psychrometer. Atmospheric pressure can be entered manually.
The app supports 12 indicators across 16 calculation items, and unit conversion between Celsius/Fahrenheit and SI/Imperial units can be performed instantly by switching the temperature unit setting.
■ High-Precision Calculation Engine
This app uses the Wexler–Hyland equations combined with numerical analysis, enabling highly accurate and stable calculations across a wide range of environmental conditions.
■ Calculable Indicators
* Wet Bulb Temperature
* Dew Point Temperature
* Frost point temperature
* Relative Humidity
* Humidity Ratio(Absolute Humidity)
* Mass-based absolute humidity
* High-resolution mass-based absolute humidity
* Volumetric absolute humidity
* Humidity Deficit (HD)
* Vapor Pressure Deficit (VPD)
* Enthalpy
* Specific Volume
* Saturation Vapor Pressure
* Water Vapor Partial Pressure
* Boiling Point of Water
* WBGT (Estimated value)
* Discomfort Index (DI)
Supplementary Notes on WBGT & Discomfort Index
Outdoor WBGT is defined as:
WBGT = 0.7 Tnw + 0.1 Td + 0.2 Tg (°F)
Since globe temperature (Tg) is not an input parameter, it is estimated from dry-bulb temperature (Td) using:
Tg = 1.45 Td − 27.162 (°F)
Td and Tg show a strong correlation (n = 17,376, R² = 0.919).
Natural wet-bulb temperature (Tnw) is obtained by converting the measured wet-bulb temperature from an Assmann psychrometer to natural conditions, assuming a wind speed of 98.4 fpm (0.5 m/s) or less.
Details of this conversion algorithm are omitted.
The Discomfort Index (DI) is calculated as:
DI = 0.4 × (Td + Tw) + 15 (°F).
■ Weather Data & Sensors
By tapping the Weather Data button, you can obtain current atmospheric pressure, dry-bulb temperature, and wet-bulb temperature.
On devices equipped with a barometric pressure sensor, pressing the MEAS button allows direct pressure measurement.
Wet-bulb conditions can be set to Normal or Frozen (effective below freezing).
Corrected values can also be displayed for non-ventilated psychrometers such as the August psychrometer (ventilated types recommended for accuracy).
■App Ecosystem Integration
You can directly receive calculated dry-bulb and wet-bulb temperatures from the companion app “Calculator of Air”.
(Please note that calculations must be performed in Calculator of Air before data can be transferred.)
By combining HumidCalc with Calculator
A versatile humidity calculation app for everyone from general users to engineers — also suitable for agricultural applications.
This app allows you to easily calculate indicators such as the Discomfort Index, WBGT (estimated heat stress index), Volumetric Absolute Humidity (an important indicator for influenza prevention), and Humidity Deficit (HD) used in agriculture, using weather data.
You can also calculate a wide range of air properties from dry-bulb temperature (normal air temperature) and wet-bulb temperature obtained from ventilated psychrometers such as the Assmann psychrometer. Atmospheric pressure can be entered manually.
The app supports 12 indicators across 16 calculation items, and unit conversion between Celsius/Fahrenheit and SI/Imperial units can be performed instantly by switching the temperature unit setting.
■ High-Precision Calculation Engine
This app uses the Wexler–Hyland equations combined with numerical analysis, enabling highly accurate and stable calculations across a wide range of environmental conditions.
■ Calculable Indicators
* Wet Bulb Temperature
* Dew Point Temperature
* Frost point temperature
* Relative Humidity
* Humidity Ratio(Absolute Humidity)
* Mass-based absolute humidity
* High-resolution mass-based absolute humidity
* Volumetric absolute humidity
* Humidity Deficit (HD)
* Vapor Pressure Deficit (VPD)
* Enthalpy
* Specific Volume
* Saturation Vapor Pressure
* Water Vapor Partial Pressure
* Boiling Point of Water
* WBGT (Estimated value)
* Discomfort Index (DI)
Supplementary Notes on WBGT & Discomfort Index
Outdoor WBGT is defined as:
WBGT = 0.7 Tnw + 0.1 Td + 0.2 Tg (°F)
Since globe temperature (Tg) is not an input parameter, it is estimated from dry-bulb temperature (Td) using:
Tg = 1.45 Td − 27.162 (°F)
Td and Tg show a strong correlation (n = 17,376, R² = 0.919).
Natural wet-bulb temperature (Tnw) is obtained by converting the measured wet-bulb temperature from an Assmann psychrometer to natural conditions, assuming a wind speed of 98.4 fpm (0.5 m/s) or less.
Details of this conversion algorithm are omitted.
The Discomfort Index (DI) is calculated as:
DI = 0.4 × (Td + Tw) + 15 (°F).
■ Weather Data & Sensors
By tapping the Weather Data button, you can obtain current atmospheric pressure, dry-bulb temperature, and wet-bulb temperature.
On devices equipped with a barometric pressure sensor, pressing the MEAS button allows direct pressure measurement.
Wet-bulb conditions can be set to Normal or Frozen (effective below freezing).
Corrected values can also be displayed for non-ventilated psychrometers such as the August psychrometer (ventilated types recommended for accuracy).
■App Ecosystem Integration
You can directly receive calculated dry-bulb and wet-bulb temperatures from the companion app “Calculator of Air”.
(Please note that calculations must be performed in Calculator of Air before data can be transferred.)
By combining HumidCalc with Calculator
Latest updates
1.2.8
- Added "Auxiliary Input Mode," allowing numeric input for Dew Point Temperature and Relative Humidity.
In addition to the standard input ("Atmospheric Pressure × Dry-Bulb Temperature × Wet-Bulb Temperature"), you can now enter values using two distinct modes:
• Atmospheric Pressure × Dry-Bulb Temperature × Dew Point Temperature
• Atmospheric Pressure × Dry-Bulb Temperature × Relative Humidity
- Added Pictogram Indicators next to the WBGT (Estimated Value) and Discomfort Index numbers to help you visually check heatstroke risk and mugginess.
(For pictogram types and threshold values, please check the 9th and 10th screenshots.)
- Updated the ad format from standard Adaptive Banners to Collapsible Banners.
[Important: How to use the new "Auxiliary Input Mode" & Tip]
While this update adds support for Relative Humidity and Dew Point inputs, this app is designed to prioritize calculation based on the "Dry-Bulb Temperature × Wet-Bulb Temperature" combination.
Therefore, changes in the Dry-Bulb or Wet-Bulb temperatures will automatically update and recalculate the Dew Point and Relative Humidity values accordingly.
● Tip for accurate input:
Always enter and set the Dry-Bulb Temperature first.
If you change the Dry-Bulb Temperature later, any previously entered Relative Humidity or Dew Point values will be automatically recalculated to match the new temperature.
For a smooth experience, we recommend entering values from top to bottom, starting with Atmospheric Pressure!
