How Many Bundles of Shingles for a 20x30 Roof?
Short answer for a 20x30 ft house footprint with a 6/12 roof pitch: about 23 bundles (bundles of shingles (+10%)). Also: roofing squares (+10%): 7.4 squares; roof surface area: 671 ft²; pitch multiplier: 1.118 ×.
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| Roofing squares (+10%) | 7.4 squares |
|---|---|
| Roof surface area | 671 ft² |
| Pitch multiplier | 1.118 × |
How this number is calculated
Roof area ≈ footprint × pitch multiplier = 20 × 30 × 1.118 = 671 sq ft = 6.7 squares. Add 10% for waste and starter/ridge: 7.4 squares × 3 bundles = 23 bundles.
Nearby sizes
| Size | Bundles of shingles (+10%) |
|---|---|
| a 24x24 ft house footprint with a 6/12 roof pitch | 22 bundles |
| a 24x30 ft house footprint with a 6/12 roof pitch | 27 bundles |
| a 20x24 ft house footprint with a 6/12 roof pitch | 18 bundles |
| a 24x36 ft house footprint with a 6/12 roof pitch | 32 bundles |
Tips
- Hips, valleys and dormers raise waste; ask a roofer to measure complex roofs.
- One roofing square is 100 sq ft, and most shingles come 3 bundles to the square.
- Steeper pitches add surface area; the multiplier accounts for that.
Frequently asked questions
How much shingles do I need for a 20x30 ft house footprint with a 6/12 roof pitch?
Short answer for a 20x30 ft house footprint with a 6/12 roof pitch: about 23 bundles (bundles of shingles (+10%)). Also: roofing squares (+10%): 7.4 squares; roof surface area: 671 ft²; pitch multiplier: 1.118 ×.
How is the quantity for a 20x30 ft house footprint with a 6/12 roof pitch calculated?
Roof area ≈ footprint × pitch multiplier = 20 × 30 × 1.118 = 671 sq ft = 6.7 squares. Add 10% for waste and starter/ridge: 7.4 squares × 3 bundles = 23 bundles.
How much does shingles for a 20x30 ft house footprint with a 6/12 roof pitch cost?
Using rough planning prices (per roofing square; a rough installed range (materials and labor) that varies widely by region and shingle type), the material for a 20x30 ft house footprint with a 6/12 roof pitch comes to about $2,583 to $4,796. Prices vary by region and supplier, so get a local quote.