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Calcimator

Ductwork Pressure Loss Calculator

Calculate total static pressure loss through ductwork including straight runs, fittings, and equipment for blower selection.

Inputs

ft
"WC/100ft
CFM
"WC
"WC

Results

Total Static Pressure

0.66 "WC

External Static Pressure

0.36 "WC

Duct Friction Loss0.12 "WC
Fitting Loss0.21 "WC
Equipment Loss (filter+coil+grille)0.33 "WC
How to Use This Calculator
  1. Enter Total Equivalent Length, Friction Rate, and System CFM.
  2. Set Number of Elbows, Loss per Elbow, and Number of Tees/Transitions.
  3. Adjust Loss per Tee as needed.
  4. Review Total Static Pressure () and External Static Pressure ().
  5. Use Duct Friction Loss () and Fitting Loss () to inform your decision.
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