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P Property Improve Roof calculator Methodology About Reviewed by a Texas-licensed GC

Shingle Bundle Calculator

Three things get ordered separately and three things get under-ordered: field shingles, ridge cap, and starter strip. This calculator covers all three so the order is complete.

How many bundles?

Use the roof sqft, not the home sqft. Estimate it here if you don't know.
Most architectural shingles are 3 bundles per square. Heavy / luxury profiles can be 4–5.
10% is typical for a clean rectangle. 12–15% for a hip roof with valleys. 18–22% for a cut-up roof with multiple dormers.
Add the LF of every hip and valley. Each needs ridge cap and the cap shingle eats from this allowance.
The horizontal top edges. Common gable: one ridge run. Hip: multiple shorter pieces.
Use the perimeter of the bottom edge — every eave needs a starter course.
Total bundles needed
85
24.00 squares · 3 bundles/sq · 10% waste
Field shingles80 bundles
Ridge cap (hips + ridge)4 bundles · 130 LF
Starter strip1 bundles · 110 LF eaves
Order an extra bundle or two. Ridge cap bundles are the most likely short. A leftover bundle is cheaper than a same-day yard run.
How this is calculated

Field: ⌈(roof_sqft ÷ 100) × bundles_per_square × (1 + waste %)⌉

Ridge cap: ⌈(hips_LF + ridge_LF) ÷ 35 LF per bundle⌉

Starter: ⌈eave_LF ÷ 120 LF per bundle⌉

→ Roof Replacement Cost Calculator
Get installed price including labor and tear-off.

The three bundle counts that matter

  • Field shingles — the main surface. Almost all asphalt is sold at 3 bundles per 100 sqft (one square). Heavy designer / luxury profiles can run 4–5.
  • Ridge cap — runs the top of every hip and ridge. Cheaper to buy purpose-made cap shingles than to cut from field; one cap bundle covers about 35 LF.
  • Starter strip — runs along the eave and rakes (sometimes). One starter bundle covers ~120 LF. Don't skip this — adhesive-strip starter beats cutting from field every time.

Waste factors that aren't waste

"Waste" is misleading. Most "waste" is actually cuts at hips, valleys, rake edges, and around penetrations — the bundle has to cover the cut piece and the offcut. The number to use:

  • 10% — clean rectangle, simple gable, no penetrations.
  • 12–15% — typical hip roof with 4–6 penetrations.
  • 18–22% — cut-up roof with multiple dormers or many valleys.

Order one extra bundle

Ridge cap is the most likely line item to come up short. A leftover bundle costs $40 and goes in the attic for a future repair; a same-day yard run costs an hour of crew time and risks a different lot number. Order an extra bundle of cap, and a half-bundle of field for the same reason.

Color lot matters

Asphalt shingles are dye-lot batched. Two bundles of the same color from different production runs don't always match. If you're buying in stages — initial order plus a make-up order later — you may end up with visible color banding. Order the entire job from one delivery if you can; if you have to add later, buy a bundle from the same shipment now and stage it.

Companion calculators

About this calculator

Reviewed by Eurocraft, a Texas-licensed general contractor. Coverage assumptions follow standard asphalt-shingle install practice; designer profiles and synthetic slate / cedar shake have different bundle counts and aren't covered here.