Ridge Vent Calculator

Calculate ridge vent length needed for proper attic ventilation.

Surface area measurement (length × width for rectangles).
sq ft
Linear measurement in the specified unit.
ft
Enter the vent type value for this calculation.

Results

NFA Required:
Calculated nfa required based on your inputs.
-sq in
Ridge Vent Needed:
Calculated ridge vent needed based on your inputs.
-ft
Ridge Coverage:
Calculated ridge coverage based on your inputs.
-%
Reference: Industry Standards. 1:150 ventilation ratio per IRC and NRCA.