Ridge Cap Calculator
Enter your size to get ridge cap quantity, plus an estimated cost. Waste is included and prices are editable.
Material needed
Estimated cost
How to calculate ridge cap
Ridge caps sold by the foot. Enter ridge length to get caps needed.
Formula: quantity = length × 1 × (1 + waste %) = 20 × 1 × 1.10 = 22 caps.
Worked example
Example: 20 ft long. Quantity: 22 caps, about $66 at $3 per caps.
Tips
Measure the full area, then subtract large openings if you want an exact count. Order a little extra for cuts and breakage, and confirm quantities with your supplier before you buy.
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Frequently asked questions
How much ridge cap do I need?
Example: 20 ft long. Quantity: 22 caps, about $66 at $3 per caps.
How much waste should I add?
Add 10% for straight areas and 15% for areas with many cuts, corners and openings.
Are the prices accurate?
Prices are editable estimates. The defaults are typical US figures, and your local price can be higher or lower.