Printable Attic Vent Calculator
This sheet is for homeowners, roofers, and remodelers who need a quick attic ventilation check. It has columns for attic name, length, width, ratio, intake percentage, intake NFA each, exhaust NFA each, total NFA in square inches, intake count, and exhaust count. Enter attic dimensions, choose 150 or 300, and add the NFA values for the vents you plan to use. The rows are set up for multiple attic areas, such as a main house section or other roof spaces.
Free printable · PDF
- 1 page
- US Letter, landscape — choose “Fit to page” for A4
- PDF, 50 KB
Free for personal, family and classroom use.
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Use it by typing the attic dimensions and product NFAs into the blank fields. The required areas and vent counts calculate automatically, so you can compare intake and exhaust needs before ordering vents or planning a roof job.
Good for
- Sizing intake and exhaust vents
- Checking attic ventilation ratios
- Planning multiple attic sections
Tip: Print in landscape and keep product NFA labels nearby when filling in vent counts.
4 files · PDF, DOCX, XLSX
Get every sheet: Attic Ventilation Planning Pack
This sheet plus 3 more in one download, with the editable Word and Excel files. Attic ventilation worksheet, Excel vent calculator with product NFA inputs, attic inspection checklist and a roof project log.
$5.00 USD, one-time 4 files · about $1.25 each
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- 7-day refund
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Printable Attic Ventilation Worksheet1 page · free PDF
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