Roofing Square Count Calculator
1 roofing square = 100 ft². Bundles = squares × 3 (for 3-tab) or × 4 (architectural).
Result
Bundles needed
106
24.00 squares × 4 bundles × 1.1.
- Roof area2400 ft²
- Squares24.00
- Bundles per square4
- Total bundles106
- Underlayment rolls (1 per 4 sq)6
- Drip edge LF (perimeter)add separately
Step-by-step
- Squares = 2400 / 100 = 24.00.
- Bundles = 24.00 × 4 × 1.1 = 105.6.
- Round up: 106.
How to use this calculator
- Enter actual roof surface area.
- Pick shingle type.
- Read bundle count.
About this calculator
Roofers think in "squares" — a square = 100 ft². 3-tab shingles cover a square with 3 bundles; architectural with 4; premium with 5+. Waste includes ridge/hip caps, broken pieces, and learning curve. Roof area is on-the-roof area (not building footprint) — multiply footprint by pitch factor (typically 1.05-1.41).
Frequently asked
Multiply footprint × pitch factor: 4/12 → 1.054, 6/12 → 1.118, 8/12 → 1.202, 12/12 (45°) → 1.414.
Related calculators
Shingle Bundle Count Calculator
Bundles = roof area / coverage per bundle (33⅓ ft² for 3-tab).
Exterior Paint Quantity Calculator
Exterior coverage typically 250-300 ft²/gal — rougher surfaces, porous siding.
Plywood Sheet Count Calculator
Sheets = surface area / 32 ft² (standard 4×8 sheet) + waste.
Lumber Board Feet Calculator
Board-feet = (thickness in × width in × length ft) / 12 × pieces.
Lumber Linear Feet Cost Calculator
Total = pieces × length × $/LF.
Asphalt Tonnage Calculator
Tons of hot-mix asphalt for a driveway or parking area, given dimensions and lift thickness.