A bundle of shingles covers about 33.3 square feet, three to a square. A 4x8 sheet covers exactly 32 square feet. A synthetic underlayment roll covers 10 squares, a felt roll 4 or 2, and a roll of ice and water shield exactly 200 square feet.
Every roofing material is sold in a unit that covers a stated amount, and half of estimating is knowing which unit buys which part of the roof. Field material comes off the area: shingles by the bundle at three per square, sheathing by the 4x8 sheet at 32 square feet, underlayment by the roll. Everything that keeps water out of that field is bought by the linear foot instead: ridge cap along every ridge and hip, drip edge and starter along every eave and rake, valley metal down every valley. This is every coverage figure in one table.
| Material | Unit | Covers | Note |
|---|---|---|---|
| Architectural shingles | Bundle | ≈33.3 sq ft | 3 bundles per square; printed on the wrapper |
| Three-tab shingles | Bundle | ≈33.3 sq ft | 3 bundles per square |
| Designer / heavyweight shingles | Bundle | ≈25 or 20 sq ft | 4 or 5 bundles per square — always check |
| Hip and ridge cap | Bundle | ≈20–25 linear ft | At 5 in exposure; brand-dependent |
| Three-tab cut into caps | Bundle | ≈33 linear ft | Each shingle yields three caps |
| Starter strip | Bundle | ≈100–120 linear ft | Eaves and rakes both need it |
| Roof sheathing | 4x8 sheet | 32 sq ft | Exact — 3.125 sheets per square |
| Synthetic underlayment | Roll | 10 squares (1,000 sq ft) | Before laps; allow ~10% |
| 15 lb felt | Roll | 4 squares (400 sq ft) | Before laps |
| 30 lb felt | Roll | 2 squares (200 sq ft) | Before laps |
| Ice and water shield | Roll | 200 sq ft | 36 in x 66.7 ft — 2 squares |
| Drip edge | 10 ft piece | ≈9 ft 10 in | After a 2 in lap |
| Valley metal | 10 ft piece | ≈9 ft 6 in | After a 6 in lap |
| Roofing nails, 1¼ in | Pound | ≈140 nails | ≈2 lb per square at 4 nails |
| Coil nails | Coil | 120 nails | ≈2.2 coils per square, architectural |
| Roof coating | Gallon | 50–100 sq ft per coat | Rate is on the pail; texture halves it |
| Exposed-fastener metal panel | Panel | 36 in of width | 38 in nominal, 36 in after sidelap |
Shingles, sheathing and underlayment all come off the roof area divided by 100 for squares. Ridge cap, drip edge, starter strip, valley metal and step flashing all come off a perimeter measurement instead, and none of them can be derived from the area.
| Footprint | Roof area | Squares | Sheets at 10% waste |
|---|---|---|---|
| 1,000 sq ft | 1,118 sq ft | 11.2 | 39 |
| 1,500 sq ft | 1,677 sq ft | 16.8 | 58 |
| 2,000 sq ft | 2,236 sq ft | 22.4 | 77 |
| 2,500 sq ft | 2,795 sq ft | 28 | 97 |
| 3,000 sq ft | 3,354 sq ft | 33.5 | 116 |
Everything else on this page is a figure printed on a product, and products differ. Where a number moves between suppliers the table says so rather than pretending otherwise.
About 33.3 square feet for most architectural and three-tab shingles, which is three bundles to a roofing square. Heavyweight designer profiles cover 25 square feet at four per square and premium slate-look profiles 20 at five.
Synthetic underlayment is usually 10 squares — 1,000 square feet — per roll, 15 lb felt is 4 squares and 30 lb felt is 2. Those are figures before the laps, so allow about 10% less usable coverage.
A standard roll is 36 inches by 66.7 feet, which is exactly 200 square feet or two squares. That figure does not vary between brands the way bundle coverage does.
Because most of them are product specifications rather than definitions. A square is always 100 square feet and a 4x8 sheet is always 32, but bundle and roll coverage is set by the manufacturer and printed on the wrapper.