Quantity · Roofing squares
Roofing Square Calculator
Convert building footprint and pitch into roofing squares and asphalt shingle bundles — with waste for simple or cut-up roofs.
Roof size & pitch
Roofing squares to order
22.1
squares incl. 10% waste · 67 bundles
- Pitch
- 6/12 · ×1.118
- Roof area
- 2,012 sq ft
- Squares (raw)
- 20.12
- With waste
- 22.14 sq
Asphalt bundles
67
3 bundles per square × 22.14 sq → order whole bundles. Metal and tile are sold differently — use squares for those quotes.
Breakdown
- Footprint × multiplier = 2,012 sq ft roof
- ÷ 100 = 20.12 squares
- + waste → 22.14 squares / 67 bundles
Price data updated . National US ranges from published supplier and contractor averages. Not a bid. Local quotes vary.
How roofing squares are calculated
Contractors quote materials in squares. Footprint alone understates the job — pitch stretches the surface. Waste covers cut-offs at hips, valleys, and eaves.
roof_area = footprint_sq_ft × pitch_multiplier squares = roof_area ÷ 100 order_sq = squares × (1 + waste %) bundles = order_sq × 3 (typical asphalt)
Worked example. An 1,800 sq ft footprint at 6/12 (multiplier 1.118) is 2,012 sq ft of roof → 20.1 squares. With 10% waste you plan 22.1 squares ≈ 67 bundles at 3 per square.
Footprint to squares chart (no waste)
Quick lookup from common house footprints and pitches. Add 10–15% waste before you order. Multipliers match our roof pitch calculator.
| Footprint | 4/12 | 6/12 | 8/12 | 12/12 |
|---|---|---|---|---|
| 1,000 sq ft | 10.5 | 11.2 | 12.0 | 14.1 |
| 1,500 sq ft | 15.8 | 16.8 | 18.0 | 21.2 |
| 1,800 sq ft | 19.0 | 20.1 | 21.6 | 25.5 |
| 2,000 sq ft | 21.1 | 22.4 | 24.0 | 28.3 |
| 2,500 sq ft | 26.4 | 28.0 | 30.1 | 35.4 |
| 3,000 sq ft | 31.6 | 33.5 | 36.1 | 42.4 |
- One roofing square = 100 sq ft of roof surface (not footprint).
- Most asphalt shingles ship 3 bundles per square; some premium lines use 4 — check the wrapper.
- Order by whole bundles; leftover starter/ridge packs are sold separately.
Roofing square calculator FAQ
- What is a roofing square?
- One roofing square is 100 square feet of roof surface area — the unit contractors and suppliers use to price shingles, underlayment, and tear-off. It is not the same as your building’s footprint square footage.
- How do I convert square feet to roofing squares?
- Multiply footprint by the pitch area multiplier to get roof surface sq ft, then divide by 100. Example: 1,800 sq ft footprint at 6/12 (×1.118) ≈ 2,012 sq ft of roof → about 20.1 squares before waste.
- How much extra should I order?
- Plan 10% waste on a simple gable. Use about 15% when the roof has valleys, dormers, hips, or many cuts. Always round up to whole bundles — leftover partial bundles are hard to return once opened.
- How many bundles are in a square?
- Most 3-tab and architectural asphalt shingles are three bundles per square. Some thicker laminates ship four — read the bundle label. This calculator assumes three, which matches the majority of US residential asphalt products.
- Does this include ridge, starter, or underlayment?
- No. Squares and field-shingle bundles cover the main roof planes. Starter strip, hip/ridge caps, ice-and-water shield, and underlayment are separate line items — estimate those after you know squares, then price the job in the roofing cost calculator.
- Can I use this for metal or tile?
- Use the square count for any material — that is the common quoting unit. Bundle counts apply to asphalt only. Metal and tile are ordered by panels, squares, or pieces per the manufacturer’s coverage chart.
Next: price the roof
Now estimate what this will cost → · Check pitch & multiplier · All roofing calculators