Roof Vent Calculator
Calculate roof ventilation requirements, vent types, and materials needed for proper attic ventilation. Get precise calculations and cost estimates for any roof.
Step 1: Roof Dimensions
Ventilation Requirements
Proper attic ventilation requires 1 sq ft of net free vent area per 150-300 sq ft of attic floor space, depending on climate and roof design.
Step 2: Vent Details
About Roof Ventilation
Proper roof ventilation extends roof life, reduces energy costs, and prevents moisture damage. Balanced systems combine intake (soffit) and exhaust (ridge) vents.
Roof Vent Calculation Results
Total Project Cost
Roof Ventilation Requirements
Installation Recommendations
For balanced ventilation: Install intake vents along soffits and exhaust vents at ridge. Maintain 50/50 ratio between intake and exhaust for optimal airflow.
Material & Cost Breakdown
Ventilation Calculation Formula
Total NFVA = Attic Floor Area ÷ Ventilation Ratio
Calculate required Net Free Vent Area by dividing attic floor area by ventilation ratio (typically 150-300). Then divide total NFVA by NFVA per vent to determine number of vents needed.
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