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Chimney Cap Calculator

Result
—cap size
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Cap Size
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CalcBuild › Chimney Cap Calculator

How to Calculate Chimney Cap

Use this free chimney cap calculator to get instant, accurate results for your construction project. Simply enter your measurements above and the calculator will automatically compute the result using industry-standard formulas.

Pro Tip: Always add 10-15% extra material to account for waste, cuts, and job-site conditions. This is standard practice recommended by experienced contractors.

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💡 Pro Tips — Chimney Cap

❓ Frequently Asked Questions

+How many blocks per sq ft?
Standard CMU (8×8×16): 1.125 per sq ft. Standard brick: 6.75 per sq ft with 3/8" mortar joints.
+How much mortar per block?
One 80-lb bag lays about 35 standard blocks or 100 bricks.
+How high can I build without engineering?
Unreinforced: 4-6ft depending on local code. Over 4ft retaining walls almost always need engineering.
+What mortar type do I use?
Type S: structural, retaining walls, below grade. Type N: general above-grade, veneer. Type M: heavy loads, foundations.