Roof cap material estimator

Roof Ridge Cap Calculator

Estimate ridge cap shingles, hip caps, or metal roof cap pieces from ridge length, hip length, piece exposure, bundle coverage, waste, and cost. It fills the roofing accessory gap after roof area, underlayment, drip edge, and step flashing.

Units

Ridge length (ft)Hip length (ft)Coverage per bundle (ft)Cap exposure per piece (in)Waste / laps (%)Cost per bundle ($)

Bundles to buy

Cap length

Cap pieces

Rough cost

Ridge cap layout depends on the roof system

This calculator estimates ridge and hip cap quantities only. Venting ridge, starter or end caps, laps, wind zone, profile, fastener pattern, hip/ridge intersections, and manufacturer instructions can change the final order.

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Roof Shingle Calculator

Estimate roof squares and shingle bundles before caps.

Roof Underlayment Calculator

Estimate roof roll coverage for the same roof planes.

Drip Edge Calculator

Estimate eave and rake trim sticks around the roof edge.

View all

Roof ridge cap formula

Measured cap length = ridge length + hip length

Order cap length = measured length × (1 + waste %)

Bundles = order cap length ÷ coverage per bundle

Pieces = order cap length ÷ cap exposure

Sample takeoff

A roof with 40 ft of ridge, 32 ft of hips, 20 ft bundle coverage, 12 in cap exposure, and 10% waste needs about four bundles and 80 cap pieces.A roof with 12 m of ridge, 9.6 m of hips, 6 m bundle coverage, 300 mm cap exposure, and 10% waste needs about four bundles and 80 cap pieces.

Roof Ridge Cap Calculator FAQ

How do I calculate roof ridge caps?+

Add ridge length and hip length, add waste for laps and cuts, then divide by the coverage per bundle or piece exposure.Add ridge length and hip length, add waste for laps and cuts, then divide by the coverage per bundle or piece exposure.

Does ridge vent change the count?+

It can. Vented ridge caps, end caps, closures, and manufacturer overlap rules can change both coverage and accessory pieces.It can. Vented ridge caps, end caps, closures, and manufacturer overlap rules can change both coverage and accessory pieces.

Can I use this for metal roof ridge cap?+

Yes for a planning count if you enter metal cap coverage and exposure. Confirm laps, closures, sealant, fasteners, and trim details with the roof system.Yes for a planning count if you enter metal cap coverage and exposure. Confirm laps, closures, sealant, fasteners, and trim details with the roof system.