How to Calculate Static Pressure
What is Static Pressure?
Static Pressure Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.
Formula
Total SP = SP of supply duct + SP of return duct + equipment SP
Step-by-Step Guide
- 1Measure each section static pressure, sum for total system SP
- 2Apply the formula using your project measurements
- 3Add required safety factors or waste allowances per code
Worked Examples
Input
0.3 supply + 0.2 return + 0.1 coil
Result
Total SP = 0.6 inches WC
Common Mistakes to Avoid
- ✕Not applying code-required safety factors or derating
- ✕Forgetting to account for waste and cut losses in material estimates
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