Bundles Needed
45
Squares
14.76
Total Cost
$1,800
Common pitches: 4:12 (moderate), 6:12 (standard), 8:12 (steep)
Typical: 10% for simple roofs, 15-20% for complex shapes
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Price as of Jul 24, 2026. Product prices and availability are accurate as of the date indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Inputs
Result
Area = 40 × 30 × √(1 + 0.25) = 1,200 × 1.118 = 1,341.6 sq ft. Squares = 13.42 × 1.1 waste = 14.76. Bundles = ⌈14.76 × 3⌉ = 45. Cost = 45 × $40 = $1,800.
Inputs
Result
Area = 24 × 20 × √(1 + 0.111) = 480 × 1.054 = 505.9 sq ft. Squares = 5.06 × 1.1 = 5.57. Bundles = ⌈5.57 × 3⌉ = 17. Cost = 17 × $30 = $510.
Divide your roof area by 100 to get squares, then multiply by 3 bundles per square (for standard shingles). A 2,000 sq ft roof needs 20 squares × 3 = 60 bundles. Add 10-15% waste for cuts and starter strips.
| Roof Area | Squares | Bundles (3-Tab) | Bundles + 10% Waste |
|---|---|---|---|
| 1,000 sq ft | 10 | 30 | 33 |
| 1,500 sq ft | 15 | 45 | 50 |
| 2,000 sq ft | 20 | 60 | 66 |
| 2,500 sq ft | 25 | 75 | 83 |
| 3,000 sq ft | 30 | 90 | 99 |
One bundle of standard 3-tab or architectural shingles covers about 33.3 sq ft (3 bundles per 100 sq ft square). Premium/designer shingles may require 4 bundles per square, covering only 25 sq ft per bundle.
Shingle costs per square (100 sq ft): 3-Tab: $90-120, Architectural: $100-150, Premium/Designer: $200-400. Material only — installation adds $150-300 per square for labor.
| Shingle Type | Material/Square | Installed/Square | Warranty |
|---|---|---|---|
| 3-Tab | $90–$120 | $350–$450 | 20–25 years |
| Architectural | $100–$150 | $400–$550 | 30–50 years |
| Premium/Designer | $200–$400 | $550–$800 | 50+ years |
| Impact-resistant | $150–$250 | $450–$650 | 30–50 years |
A roofing square equals 100 square feet of roof area. It is the standard unit for ordering roofing materials. For example, a 2,000 sq ft roof is 20 squares. Always account for roof pitch — steeper roofs have more actual area.
| Roof Pitch | Multiplier | 1,200 sq ft Footprint | Extra Area |
|---|---|---|---|
| 4:12 (low) | 1.054 | 1,265 sq ft | +5.4% |
| 6:12 (standard) | 1.118 | 1,342 sq ft | +11.8% |
| 8:12 (steep) | 1.202 | 1,443 sq ft | +20.2% |
| 10:12 (very steep) | 1.302 | 1,563 sq ft | +30.2% |
| 12:12 (45°) | 1.414 | 1,697 sq ft | +41.4% |
Read our guide
Read our guide
Read our guide
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Last Updated: Jul 24, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.
