Roofing Shingle Calculator
Estimate roofing squares and shingle bundles from roof area, pitch factor, and waste.
Shingles to order
24.64 squares
2464 sq ft of surface with waste
- Bundles
- 74
- Surface before waste
- 2240 sq ft
- Estimated cost
- $2664.00
- Bundles / square
- 3
Does not include underlayment, drip edge, starter, or ridge cap. Complex hips/valleys may need more than 10% waste.
How this calculator works
Roofers buy shingles by the square - 100 square feet of roof surface. Most asphalt shingles ship 3 bundles per square.
If you measured ground-area footprint, multiply by a pitch factor to approximate slope surface area.
squares = (area × pitch factor × waste) ÷ 100
- 3 bundles ≈ 1 square for many 3-tab/laminate shingles
- Steeper pitches need more material than flat area suggests
- Add starter strip, ridge cap, and underlayment separately
Frequently asked questions
How many bundles of shingles do I need?
Find squares (roof sq ft ÷ 100), multiply by bundles per square (usually 3), then add waste. A 2,000 sq ft roof is 20 squares, or about 66 bundles with 10% waste.
What is a roofing square?
One square equals 100 square feet of roof surface. It’s the standard ordering unit for shingles and underlayment.
How does roof pitch affect material?
Steeper roofs have more surface area than the building footprint. Pitch factors adjust flat measurements upward so you don’t under-order.
Related calculators
Keep planning your project with these tools, or browse the Roofing & Framing category.