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BuyRidge Cap Shingle Calculator
Linear feet of ridge and hip into hip-and-ridge bundles — editable coverage, default 25 ft/bundle (GAF Seal-A-Ridge)
Field shingles are sold by the square. Ridge and hip caps are sold by the linear foot in dedicated bundles. Enter ridge length, optional hip length, coverage per bundle, and waste. Method: ridge cap guide. Field failures: troubleshooting. Cut 3-tab vs pre-scored caps: comparison. Field squares: shingle bundle calculator. Hub: roofing tools.
How to Use This Ridge Cap Calculator
Tape or measure every ridge run and every hip run that gets the same hip-and-ridge product. Leave hip at 0 on a simple gable. Confirm the linear feet printed on the wrapper you will buy — GAF Seal-A-Ridge is commonly ~25 ft per bundle at 6⅔ in exposure; TimberTex and other wider-exposure products cover fewer feet. Add a waste percentage, calculate, and order the rounded-up bundle count.
total lf = (ridge + hip) × (1 + waste%/100)
bundles = ceil(total lf ÷ coverage per bundle)
bundles = ceil(total lf ÷ coverage per bundle)
Worked example — 60 ft ridge, 20 ft hip, 25 ft/bundle, 5% waste
(60 + 20) × 1.05 = 84 linear ft. 84 ÷ 25 = 3.36 → round up to 4 bundles.
Full method write-up: ridge cap guide. Field failures: troubleshooting. Cut 3-tab vs pre-scored: comparison.
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Ridge Caps, Hip Caps, and Field Shingles Are Not the Same Order
Field shingles cover the roof planes. Ridge and hip caps cover the high lines where those planes meet. Mixing the two on a material takeoff is how crews run short at the ridge while leftover field bundles sit on the driveway.
Ridge caps finish the horizontal (or near-horizontal) peak. Hip caps finish the sloping hip lines. Both are typically sold as hip-and-ridge product — the same bundle stock covers ridge and hip lineal footage — but the takeoff still has to measure both runs and add them before you divide by coverage per bundle.
Field shingles are ordered by the square (and often by the three-bundle pack). Caps are ordered by linear feet of run, then converted to bundles using the manufacturer’s published coverage. The roofing square / shingle bundle calculator handles the field. This calculator handles the high lines. Do not steal field bundles for the ridge and hope the count works out.
Caps are not leftover tabs.On architectural roofs especially, hand-cut 3-tab strips used as “free” ridge stock are a different decision — and a common warranty / crack problem. See cut shingles vs architectural ridge cap and 3-tab vs architectural shingles.
Why Coverage Per Bundle Changes by Brand (GAF Numbers)
Hip-and-ridge coverage is exposure-driven. Shorter exposure means more pieces per lineal foot and more lineal feet per bundle. Longer exposure stretches each piece along the run — fewer total feet from the same carton size.
GAF Seal-A-Ridge is the clear published planning default on this tool: approximately 25 lineal feet per bundle, with 45 pieces at a 6⅔ in exposure. That is why the coverage input defaults to 25 ft/bundle.
GAF TimberTex and similar wider-profile products use a longer published exposure (commonly cited around 8 in). Longer exposure means each piece covers more of the run, so a TimberTex-style bundle typically covers less total lineal footage than Seal-A-Ridge. You cannot swap brands and keep the same bundle count without re-checking the label.
Industry ballpark.Across manufacturers, hip-and-ridge bundles generally land in the 20–33 lineal feet per bundle range. Defaulting to 25 ft is a planning starting point — always override with the carton coverage for the SKU on the truck.
Wrong exposure on the roof shows up as gaps (exposure too long) or stacked-looking overlap (exposure too short). Both burn through the order differently than the calculator expected. Fixes: common ridge cap problems and solutions.
The Linear-Footage-to-Bundles Method
The reliable takeoff is simple:
- Measure every ridge run in feet (include each ridge segment on multi-ridge roofs).
- Measure every hip run in feet (enter 0 on a pure gable).
- Add ridge + hip for total lineal feet of hip-and-ridge product.
- Apply a waste factor (5% is a common default for cuts, starters, and center closers).
- Divide by the manufacturer’s lineal feet per bundle and always round up.
bundles = ceil( (ridge_ft + hip_ft) × (1 + waste%/100) / coverage_per_bundle )
Yards do not sell 0.36 of a hip-and-ridge bundle. Adjacent takeoffs stay on their own sheets: underlayment, nails, drip edge, and attic ventilation when the ridge is vented.
Worked Example: 60 ft Ridge + 20 ft Hip
Inputs
Ridge = 60 ft
Hip = 20 ft
Waste = 5%
Coverage = 25 ft/bundle (Seal-A-Ridge-class)
Hip = 20 ft
Waste = 5%
Coverage = 25 ft/bundle (Seal-A-Ridge-class)
Raw lineal feet:
60 + 20 = 80 lf
With 5% waste:
80 × 1.05 = 84 lf
Bundles:
ceil(84 / 25) = ceil(3.36) = 4 bundles
Order 4 bundles.Three bundles cover only 75 lf before waste — short of the 84 lf planning total. The fourth bundle covers starters, the center closer, and cut pieces at hips and ridge ends.
If the same roof used a product that covers only ~20 ft/bundle, the same 84 lf becomes ceil(84/20) = 5 bundles. Exposure and brand are not cosmetics on the purchase order.
Job Application: Starters, Direction, and Closing the Run
Coverage math assumes the pieces are installed at the published exposure. Application details that still burn inventory:
- Starter at each run.Most manufacturers call for a starter / first piece at the lower end of a hip or at the ridge end so the weather edge is finished correctly before you work toward the center (or per the published sequence).
- Work toward the center (or follow the manufacturer).Many ridge details run from both ends toward the middle and finish with a cap piece at the center. Hip runs typically start at the eave/hip intersection and work up toward the ridge. Always defer to the shingle brand’s instructions for nail placement, sealant strips, and high-wind fastening.
- Do not use field-shingle exposure on the ridge.Architectural field courses might expose 5⅛ in or 5⅔ in while the hip-and-ridge product wants 6⅔ in or 8 in. Mixing those numbers is how gaps and short orders happen.
Match the system.Architectural field shingles plus purpose-made hip-and-ridge usually keep wind ratings and warranty language aligned. Cutting 3-tab strips to save money is a separate tradeoff — covered in cut vs architectural ridge cap.
When the ridge is open for venting, size intake/exhaust with the attic ventilation calculator before you assume a solid-ridge cap layout. Step-by-step method page: ridge cap shingle guide.
What This Number Is (and Is Not)
The output is a materials takeoff for purpose-made hip-and-ridge (ridge cap) bundles measured in linear feet. It is not the field-shingle bundle count from the roofing square calculator, and it is not a wind-rating, fastening schedule, or permit document.
Starter pieces, ridge vents under the caps, and color dye lots are job details outside the arithmetic — but they are why waste exists and why you always round up. Partial bundles are not a yard SKU.
Read the wrapper on the pallet you will install.Default 25 ft/bundle matches GAF’s published Seal-A-Ridge coverage at 6⅔ in exposure. Change the coverage input when the product on the truck prints a different number.
Ridge Cap FAQ
Do hips and ridges use the same bundle?
Usually yes — hip-and-ridge product is sold for both. Measure ridge feet and hip feet separately, then add them before dividing by coverage per bundle. Simple gables leave hip at 0.
Why isn’t this in the shingle-bundle calculator?
Field shingles are sold by the square (100 sq ft). Cap shingles are sold by linear foot with a different exposure. Mixing them undercounts or overcounts the order.
Why does GAF Seal-A-Ridge say ~25 ft while TimberTex covers less?
Exposure. Seal-A-Ridge publishes about 25 lin ft/bundle with 45 pieces at 6⅔ in exposure. TimberTex’s longer (~8 in) exposure changes pieces-per-foot and typically yields fewer lineal feet per bundle. Read the carton for the SKU you buy.
Is 5% waste enough?
On simple gable ridges with few hips, 5% is a common planning default. Complex multi-hip roofs, short stub ridges, and first-time crews often warrant more. Round up to whole bundles either way.
Cut 3-tab caps or buy architectural ridge cap?
See cut shingles vs architectural ridge cap. Pre-scored caps usually win on laminated roofs and wind warranties.
Does ridge vent change the count?
Ridge vent is a separate product under the caps. Cap linear footage still follows the ridge length; confirm the vent manufacturer’s cap instructions. Attic NFA: attic ventilation calculator.
What else belongs on the same material list?
Field squares (shingle calculator), nails (nail calculator), underlayment, drip edge, and ventilation — all on the roofing hub.
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Ridge Cap Install Gear
Linear footage and bundles are only the order. On the ridge you still need a coil nailer, chalk line, hook knife for cuts and starters, and a tear-off shovel if you are stripping the old caps first.
BOSTITCH RN46-1 Coil Roofing Nailer
Coil nailer for field and cap fastening. Cap nails still need correct placement per the manufacturer — the gun just keeps the pace up on long ridge runs.
View on Amazon →
TAJIMA Chalk-Rite CR301JF Jam Free Chalk Line
Snap a centerline on the ridge before the first cap course. Extra-bold 1 mm line, 100 ft, five-gear rewind.
View on Amazon →
Stanley FatMax Hook Knife
Hook blade for trimming caps, cutting starters, and scoring 3-tab strips if you are hand-cutting ridge pieces on a budget job.
View on Amazon →
Tie Down 47.5 in Roof Ripper
Serrated tear-off shovel for stripping old ridge and hip caps before the new linear footage goes down.
View on Amazon →As an Amazon Associate, TestTalkHQ earns from qualifying purchases.