Calculator of Air

Calculator of Air

Psychrometric Charts Tool

14 ratings
10 reviews
Free
With Ads

Details

  • Released
  • Updated
  • May 12, 2016
  • April 20, 2026

Features

Calculator of Air screenshot #1 for iPhone
Calculator of Air screenshot #2 for iPhone
Calculator of Air screenshot #3 for iPhone
Calculator of Air screenshot #4 for iPhone
Calculator of Air screenshot #5 for iPhone
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About

This tool calculates humidity-related air properties with a calculator-like interface. It supports six key parameters and provides accurate results even under extreme conditions. Ideal for HVAC, cleanrooms, and industrial drying.

Calculate six humidity parameters
Accurate results under extreme conditions
Supports Celsius and Fahrenheit
Input range and safety checks
Memory function for continuous calculations
Available in multiple languages
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What's New in Calculator of Air

1.2.3

April 20, 2026

- Changed the ad banner from a Smart Banner to an Adaptive Banner. - Fixed a layout issue that occurred on some devices. - Updated to comply with the privacy requirements introduced in iOS 14 (IDFA and App Tracking Transparency). - Optimized the UI for 6.5-inch displays on iPhone X and later models. - Updated the AdMob advertising SDK. - Improved the numerical analysis algorithms, resulting in faster calculations and accurate computation of relative humidity and dew point even at extremely low temperatures (below −150 °C / -238°F ). - Fixed a bug in the exception handling logic.

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User reviews

Love the App, Update Broke Display

As an HVAC controls technician this app is incredibly useful. I use this app all the time.

The latest update broke the display though, now the app is only rendering in the upper left-hand corner of my screen with a big black border around the rest of the screen. I’m on an iPhone 17 Pro.

Response from developer

Thank you very much for your report, and I sincerely apologize for the delayed response. I truly appreciate you taking the time to let me know about the issue. Could you please provide a bit more detail about the layout problem occurring on your iPhone 17 Pro? It would be very helpful if you could also let me know which version of iOS is installed on your device. I am currently investigating this issue and plan to release a new version with improvements in the near future. However, since the exact cause has not yet been fully identified, it is possible that the same issue may still occur in the upcoming version. I apologize for the inconvenience and would greatly appreciate your reply.

Good app

I’ve been using this for a while, it works !

Response from developer

Sorry for the very late reply. Thank you for your high evaluation! The "Calculator of Air" implements a memory function, and by utilizing this function, you can use this application even more conveniently. As an example, we will explain how to calculate the relative humidity when outdoor air is taken into a room and then heated. *When humidification is not performed. 1: Enter the temperature and humidity of the outside air into the "Calculator of Air". 2: Press the "Dew Point" button. 3: Next, press the "TEMP." button and after entering the indoor temperature, press "ENTER". With this simple operation, you can calculate the indoor humidity. If you have a chance, please try it.

Good but too many digits

There are way too many digits in the output values. I’d suggest 3 significant figures or make it a user option. A very useful app otherwise!
SteveK

Response from developer

I sincerely apologize for the delay in my reply to you. There is a way to alleviate the inconvenience caused by the large number of digits in this app. The app has a function where if you press "TEMP." or "Wet Bulb" or "Dew Point" or "HUMID." or "HUM Ratio" or "Enthalpy" after performing a calculation, the value of the button you press will be retained and all other values will be erased. With this function, for example, if you are calculating the outdoor dew point temperature from the outdoor temperature and outdoor humidity, and then the indoor humidity from the indoor temperature and the outdoor dew point temperature, then you can easily calculate the indoor humidity from the operations described below. (1)First of all, calculate the dew point temperature from the outdoor temperature and the outdoor humidity using this app. (2)In that state, please tap the "Dew Point" button. All numerical values ​​other than "Dew Point" are erased from the calculation result screen, and only the numerical value of "Dew Point" remains. (3)In that state, enter the indoor temp and tap the "ENTER" button. This app calculates indoor humidity. I'm sorry, I'm Japanese so I'm bad at English.

食品の乾燥に利用してます

気温、相対湿度から瞬時に絶対湿度を計算してくれるので、非常に重宝してます!
作成者さんありがとう!

Enthalpy?

Just to cross ck proper use:

1) Don’t I need return & supply WB to ascertain change in ethalpy? There is only 1 temp & 1 WB entry - so how are we calc enthalpy

2) For TTL btu change I’d need the enthalpy X ACFM. Where is the function to make this final reading?

Response from developer

I read your review, but there are some incomprehensible points in your review, and your review has words that I don't understand. The following is a summary of those things, so please have a look. For question 1, you may have misunderstood this app. This app is an application to facilitate the calculation of humidity charts, but it's not an application for checking changes in enthalpy, so there's only 1 TEMP and 1 WB entry. By the way, the approximate formula for calculating enthalpy(btu/lb) is as follows. btu/lb = 0.24t + (0.44t + 1061.13)x t --- Fahrenheit temperature(℉) x --- Humidity ratio(lb/lb) For question 2, I am sorry, I don't understand the meaning of the following words. - TTL btu - X ACFM If you explain that to me, I may be able to give you good advice.

Developer apps

FAQ

What is Calculator of Air?

Calculator of Air is a psychrometric calculation app used to determine humidity-related properties of moist air. It uses the Wexler–Hyland formulation for accurate results.

What parameters can Calculator of Air calculate?

It supports calculating dry-bulb temperature, wet-bulb temperature, dew point temperature, relative humidity, humidity ratio, and enthalpy. You only need to input any two of these to get the rest.

Does Calculator of Air support different temperature units?

Yes, Calculator of Air supports both Celsius (°C) and Fahrenheit (°F) for temperature inputs and calculations.

What is the input range for Calculator of Air?

Temperature can be entered from -273.15 °C to 99.97 °C. Relative humidity ranges from 0% to 100%. Atmospheric pressure is fixed at standard.

Does Calculator of Air have ads?

Yes, Calculator of Air contains advertisements.

How does the memory function in Calculator of Air work?

The memory function allows you to store calculated values for subsequent calculations, enabling continuous air-state analysis. This is useful for complex scenarios like calculating indoor humidity based on outdoor conditions.

What devices is Calculator of Air available on?

Calculator of Air is available for iPhone and iPod devices.

How often is Calculator of Air updated?

The latest version is 1.2.2, last updated on March 3, 2026. This indicates a history of updates, suggesting ongoing support and potential improvements.