Total External Static Pressure (TESP) Calculator
TESP is the sum of the supply and return static pressures measured outside the air handler.
HVAC Pro calculator — inputs, formula and example are open to everyone.
Result
Results for this calculator are part of HVAC Pro
You can see the inputs, formula and worked example. Unlock results for every Pro calculator.
Unlock with HVAC ProAlready a member? Sign in
Formula
- TESP = |supply static| + |return static|
Example calculation
+0.45 supply and −0.30 return → 0.75 inWC (150% of a 0.50 rating).
Practical HVAC use
Diagnose airflow problems with the blower performance table.
Common mistakes
- Measuring after the coil when the coil is external to the cabinet.
- Subtracting the return reading.
Related calculators
Educational tool. Results are estimates from the stated formulas; always confirm with manufacturer data and the code adopted in your jurisdiction. All calculators