Roof Shingles Calculator
Calculate how many shingles bundles and squares you need to roof a house. Accounts for roof pitch, waste factor, hips and ridges, and provides a cost estimate for your roofing project.
🏠 Roofing🏗️ Squares = Roof Area / 100 sq ft | Bundles = Squares x 3
House footprint length (ft)
House footprint width (ft)
Roof pitch (rise/12)
Number of hips/ridges (linear ft)
Roof type
Price per bundle ($)
Please enter valid values.
Formula & Reference
| Variable | Formula | Units |
|---|---|---|
| Roof Shingles Calculator | Squares = Roof Area / 100 sq ft | Bundles = Squares x 3 | bundles + squares |
Step-by-Step Examples
Example 1
Standard Gable Roof
40x28 ft house, 6/12 pitch, gable, $35/bundle.
- Plan area: 40x28x2 = 2,240 sq ft
- Pitch mult 1.118: 2,503 sq ft
- + 10% waste = 2,753 sq ft = 27.5 squares
- Bundles = 27.5x3 = 83 bundles
- Cost = 83 x $35 = $2,905
✓ 83 bundles, ~$2,905 materials
Example 2
Hip Roof
36x24 ft house, 8/12 pitch, hip.
- Plan area = 1,728 sq ft
- Pitch mult 1.202: 2,077 sq ft
- Hip adjustment 1.15x: 2,389 sq ft
- + 10% waste = 26.3 squares = 79 bundles
✓ 79 bundles
Example 3
Complex Multi-Gable
45x32 ft house with dormers, 8/12 pitch.
- Plan area = 2,880 sq ft
- Pitch mult 1.202: 3,462 sq ft
- Complex 1.20x: 4,154 sq ft
- + 10% waste = 45.7 squares = 137 bundles
✓ 137 bundles for complex roof
Real-World Applications
Homeowners
Calculate shingle quantities before getting contractor bids.
Roofing Contractors
Fast material estimates for bid proposals and job costing.
Budget Planning
Material cost alone is 40-50% of a typical roof replacement project.
Material Purchasing
Bundle count for ordering from roofing supply houses.
Common Mistakes to Avoid
⚠️
Using floor plan area without pitch adjustment
Always multiply the plan area by the pitch factor (rafter multiplier) to get actual roof area. A 6/12 pitch adds 11.8% more area; a 12/12 pitch adds 41.4%.
⚠️
Not adding enough waste
Add 10% minimum for straight gable roofs. Hip and valley cuts waste more material - add 15% for complex roofs. Include ridge cap shingles separately.
⚠️
Forgetting ridge cap bundles
Standard bundles cover main roof area. Ridge cap shingles cover the peaks and hips. Estimate about 1 bundle per 33 linear feet of ridge/hip.
Frequently Asked Questions
How many bundles per square? ▾
Standard 3-tab and architectural shingles: 3 bundles = 1 square (100 sq ft). Some heavyweight or large-format shingles require 4 bundles per square. Check your specific shingle package.
How many squares for an average house? ▾
A typical 1,500-2,000 sq ft single-story house has 18-25 squares. A 2-story 2,000-2,500 sq ft house has 25-40 squares, depending on roof complexity and pitch.
How long do asphalt shingles last? ▾
3-tab shingles: 20-25 years. Architectural (dimensional): 25-30 years. Premium architectural: 30-50 years. Lifetime shingles: 50+ years (manufacturer warranty, actual life varies).
What is the best shingle for wind resistance? ▾
Impact-resistant (IR) or Class 4 shingles offer the best storm protection and can reduce homeowners insurance premiums 20-30% in high-wind and hail-prone regions.
How much does a new roof cost? ▾
Materials: $100-$200 per square for architectural shingles. Full replacement with labor: $350-$600+ per square. A 25-square roof averages $7,500-$15,000 total installed.