Notice: This HVAC calculator provides estimates only and is for informational purposes. Results
should be verified by a licensed HVAC professional. Use at your own risk.
Technical Tool
HVAC Static Pressure Calculator (Total External Static)
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Enter Nameplate Rating & All Component Pressure Drops (in. w.g.)
Equipment
| Equipment Rated TESP | in. w.g. |
| Evaporator Coil (wet) | in. w.g. |
| Supply Filter (clean) | in. w.g. |
Accessories & Ductwork
| Return Grilles / Filter Grille | in. w.g. |
| Humidifier | in. w.g. |
Duct System Parameters — Equal Friction Method (ACCA Manual D)
| Supply Duct System Drop | in. w.g. |
| Return Duct System Drop | in. w.g. |
| System CFM | CFM |
| System Tonnage | tons |
Total TESP Used
—
—% of rated capacity
Available Duct Budget Remaining
—
—
Detailed Component Breakdown
| Component | Pressure Drop | Typical Range | Status |
|---|
🏆 Residential Target
Most residential systems are rated for 0.50 in. w.g. TESP.
🔧 High Static Symptoms
High TESP causes reduced CFM, noise, and component strain.
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How to Use the HVAC Static Pressure Calculator
The HVAC static pressure calculator is a field diagnostic tool for technicians and system designers. Total external static pressure (TESP) represents the sum of all resistance the blower motor must overcome to move air through the system.
What Is Total External Static Pressure (TESP)?
TESP is the total resistance, measured in inches of water gauge (in. w.g.), that the blower must overcome. To size the ductwork correctly so that available static pressure remains within budget, refer to the duct size calculator.
Frequently Asked Questions
What is a normal static pressure for a residential HVAC system?
For most standard residential furnaces and air handlers, the maximum rated total external static pressure (TESP) is 0.50 in. w.g.
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