Total vs Static Pressure Calculator
Split total pressure into static and velocity components.
Enter your values
ⓘ Live results
Results
- Duct velocity
- 1,500 FPM
- Velocity pressure
- 0.1403 in wc
- Total pressure
- 2.14 in wc
- Static regain factor
- 0.934
Quick answer
Total pressure equals static pressure plus velocity pressure, where velocity pressure is derived from duct velocity.
TP = SP + VP; VP = (V/4005)^2
How to use the Total vs Static Pressure Calculator
- 1Enter airflow, duct cross-section area and the measured static pressure.
- 2The tool converts velocity into velocity pressure and adds it to static pressure.
- 3Use total pressure, not static alone, for accurate fan brake horsepower calculations.
Worked example
Using the values the calculator loads with:
Inputs
- Airflow6000 CFM
- Duct area4 sq ft
- Static pressure2.0 in wc
Results
- Duct velocity1,500 FPM
- Velocity pressure0.1403 in wc
- Total pressure2.14 in wc
- Static regain factor0.934
Frequently asked questions
Why does velocity pressure matter?
It represents the kinetic energy of the moving air and is always part of the total energy the fan must supply.
What is 4005?
It is the standard constant relating FPM to velocity pressure in inches of water at standard air density.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.