Duct Calculator S&P vs Allday HVAC Calc Usage & Stats
The S&P duct calculator allows three different calculations to be carried out quickly and with ease. These calculations are divided in four areas:
1. Diameter converter, which allows converting circular to equivalent rectangular ducts.
2. Calculator of different ventilation parameters, with which will be able to obtain the diameter, the air speed, the airflow and the dynamic pressure of your installation.
3. Pressure drop calculation tool for installations with straight sections and duct system elements.
4. Units converter, with which you will be able to transform speed, airflow, power and pressure units for other equivalents in different scales.
- Apple App Store
- Free
- Utilities
Store Rank
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The application can be useful for HVAC engineers and contains 3 modules.
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. It can also be used as a reference for heat transfer fluid properties and pipe characteristics.Psychrometric calculator - allows for psychrometric calculations.
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
- Apple App Store
- Free
- Utilities
Store Rank
- -
Duct Calculator S&P VS. 
Allday HVAC CalcJanuary 11, 2026