Allday HVAC Calc
Duct, Pipe & Psychrometrics
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Practical HVAC calculations for engineers. Calculate pipes, ducts, psychrometric properties, and heat emitter parameters in SI and IP units.
The application can be useful for HVAC engineers and contains 3 modules.
Psychrometric Calculator - this module determines air properties based on input values such as dry-bulb temperature, wet-bulb temperature, and relative humidity. It provides results like humidity ratio, specific volume, enthalpy, and vapor pressure in both SI and IP units.
Pipe Calculator - this module is used to calculate velocity and pressure loss in pipelines and to select pipeline diameters for a given maximum velocity and pressure loss. The module supports interdependent calculations of flow rate, heat load, and fluid temperatures: when any three of these parameters are specified, the fourth is calculated automatically. It can also be used as a reference for heat transfer fluid properties and pipe characteristics.
Duct Calculator - the module is used to calculate the speed and pressure loss in round, rectangular and oval air ducts when moving wet or dry air through them, as well as to select their sections for a given maximum speed and maximum pressure loss. Additionally, the heating or cooling power is calculated for a given air flow rate, or reverse calculations: air flow rate for a given power; temperature of incoming or outgoing air for a given power and flow rate. It can also be used as a reference material for determining the properties of wet and dry air at different pressures and temperatures.
Also in the description sections are the reference formulas by which the calculations are made.
Web version: calc.ashrae-meteo.info
Ratings & Reviews
Pipe Calculator:
- Added a heat emitter calculation feature. You can now calculate one of the three design temperatures (supply, return, or room temperature) when the other two are known. The calculator also determines the design heat output at a specified flow rate or the required flow rate for a given heat output.
- Expanded the documentation with a new section, Calculation of Heat Emitter Parameters.
Duct Calculator:
Extended the maximum size of rectangular ducts that can be selected when either width or height is specified, up to 30 m.
The developer, Dmitrii Pankov, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Dmitrii Pankov
- Size
- 39.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Allday Design Assist $4.99
- Copyright
- © 2026 Dmitrii Pankov