Soffit Vent Area Calculator

Calculate soffit vent area needed to balance ridge ventilation.

Enter the ridge vent nfa value for this calculation.
sq in
Linear measurement in the specified unit.
ft
Enter the soffit vent type value for this calculation.

Results

Intake NFA Needed:
Calculated intake nfa needed based on your inputs.
-sq in
Vents/Length Needed:
Calculated vents/length needed based on your inputs.
-
Spacing if Individual:
Calculated spacing if individual based on your inputs.
-in OC
Reference: Industry Standards. Intake should slightly exceed exhaust NFA for positive flow.