# Allday HVAC Calc — Pipe and Duct calculations > HVAC engineering tool for psychrometric, pipe, and duct calculations. (iPhone/iPad app by Dmitrii Pankov.) - Source: https://appshunter.io/ios/app/allday-hvac-calc/id6446276144 (this page in markdown: same URL + `.md`) - Developer: [Dmitrii Pankov](https://appshunter.io/developer/1677093604) - Category: Utilities - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.0 · 40 MB - Languages: English - Released: 2023-03-16 - Data updated: 2026-06-09 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/allday-hvac-calc/id6446276144/reviews.md ## What is Allday HVAC Calc? 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 ## Key features - Psychrometric air property calculations - Pipe velocity and pressure loss calculation - Duct speed and pressure loss calculation - Interdependent parameter calculations - Reference formulas included - SI and IP unit support ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Allday Design Assist | $4.99 | one-time | ## Frequently asked questions about Allday HVAC Calc ### What calculations can Allday HVAC Calc perform? Allday HVAC Calc offers three main modules: a psychrometric calculator for air properties, a pipe calculator for fluid dynamics and selection, and a duct calculator for air speed and pressure loss in various duct types. It supports both SI and IP units. ### Is Allday HVAC Calc available on Android? Based on the provided information, Allday HVAC Calc is currently supported on iPhone, iPad, and iPod. There is no mention of Android compatibility. ### How often is Allday HVAC Calc updated? The application was last updated on April 21, 2026, with version 1.6.17. This indicates a recent update, though the frequency of future updates is not specified. ### What is the age rating for Allday HVAC Calc? Allday HVAC Calc has an age rating of 4+, making it suitable for a wide range of users. This rating suggests it contains no mature content. ### Does Allday HVAC Calc have ads? No, Allday HVAC Calc does not contain advertisements. The 'hasAds' flag is set to false, indicating an ad-free user experience. ### What is the user rating for Allday HVAC Calc? Allday HVAC Calc has a perfect rating of 5.0 stars based on one review. This single rating suggests a highly positive initial user experience. ### Can Allday HVAC Calc be used offline? The provided description does not explicitly state whether Allday HVAC Calc can be used offline. However, its nature as a calculation tool suggests it may function without an internet connection. ### Where can I find the web version of Allday HVAC Calc? A web version of Allday HVAC Calc is available at calc.ashrae-meteo.info. This allows users to access its calculation features through a web browser. ## Version history (last 5 releases) ### 1.6.17 — 2026-04-21 Pipe Calculator: - Enhanced Calculations: In the "Calculate Flow from Known Power" section, added the ability to calculate Power (Q) based on flow rate, as well as Inlet/Outlet temperatures (Tin/Tout) based on Q and flow rate. - High-Precision Mode: Triple-click headers to display additional decimal places for Q, Tin, and Tout. - Smart Sync: Temperature and flow rate values are now linked between Block 2 and Block 3 (consistent with the Duct module workflow). - Dynamic Unit Conversion: Improved behavior for alternative units in Blocks 2 and 3. When switching units after entering a value, the app now automatically recalculates the input. - Bug Fixes: * Resolved an issue with the glycol concentration dropdown menu. * Resolved an issue with incorrect viscosity values during SI-to-IP conversion for secondary units. * Fine-tuned the Friction (pressure drop) conversion factor to 0.122488 for IP systems. * Adjusted the Glycol Density conversion factor to 0.0625 for IP systems. Duct Calculator: - Dynamic Recalculation: Block 3 now automatically updates when humidity values are modified. - Improved Precision: Enhanced calculation accuracy for Block 3, including Reynolds number (Re) values. - UI Fluidity: Optimized and accelerated animations for a smoother and more responsive interface. - UI Improvements: Added grouping frames in the Duct description for better readability. - Accuracy: Standardized the Friction conversion factor to 0.122488 for IP system consistency. General Updates: - Performance: Optimized build size via image compression. - UX Overhaul: Redesigned the Help menu with categorized sections for easier navigation. - Input Fixes: Resolved selection glitches in multiple numeric input fields. - Stability: General performance improvements and minor bug fixes. ### 1.5.0 — 2025-06-30 Added assistants to help you find the best design values given the codes for pipe and duct modules ### 1.4.14 — 2025-04-22 Fixed some bugs and add some features ### 1.4.12 — 2025-03-05 Fixed a few annoying bugs. ### 1.4.11 — 2025-02-15 Introducing a new calculation. This is Duct Calculator - the module is used to calculate the speed and pressure loss in round, rectangular and oval air ducts. ## Apps similar to Allday HVAC Calc | App | Rating | Price | Category | | --- | --- | --- | --- | | [Duct Calculator Elite](https://appshunter.io/ios/app/duct-calculator-elite/id665701601) | 4.8 (220) | $6.99 | Utilities | | [IN HVAC Calculator](https://appshunter.io/ios/app/in-hvac-calculator/id1219008229) | 4.2 (11) | Free | Utilities | | [Digiduct](https://appshunter.io/ios/app/digiduct/id6738926359) | 5.0 (10) | Free | Utilities | | [Dew Point Humidity Calculator](https://appshunter.io/ios/app/dew-point-humidity-calculator/id6480256120) | 4.6 (52) | Free | Utilities | | [Psychrometrics](https://appshunter.io/ios/app/psychrometrics/id6455889577) | 4.2 (12) | $3.99 | Utilities | | [AC Calculator - HVAC Sizing](https://appshunter.io/ios/app/ac-calculator-hvac-sizing/id1537174761) | 4.8 (20) | Free | Utilities | ## Related topics [allday hvac calc](https://appshunter.io/ios/topics/allday-hvac-calc) · [allday](https://appshunter.io/ios/topics/allday) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-09.*