Roofing Squares Calculator
Convert your roof area from square feet into standard roofing squares (100 sq ft) and bundles.
- Exact Squares Needed
- 22.00 squares
- Shingle Bundles to Order
- 66 bundles
- Raw Squares (No Waste)
- 20.00 squares
- Total Area Ordered
- 2200 sq ft
Enter your values and press Calculate to see your result.
How the Roofing Squares Calculator Works
Follow the exact steps to get your result instantly and privately.
Step 1: Input Area
Enter your total roof surface area in square feet.
Step 2: Choose Waste Buffer
Select 10%, 15%, or 20% waste buffer depending on roof layout.
Step 3: Get Results
Convert to exact and rounded roofing squares instantly.
Step 1: Input Area
Enter your total roof surface area in square feet.
How to Calculate Roofing Squares
One roofing square is exactly 100 square feet. Dividing your sloped area by 100 gives raw squares, and then applying a waste factor rounds it up for ordering.
Measuring Methods
- From Your Measured Roof Area: If you already know the sloped surface area, divide by 100. A 2,350 sq ft roof is 23.5 squares before waste. If you only know the footprint, run it through the roof square footage calculator first so the pitch is included.
- From a Contractor Quote: Quotes list squares, not square feet. Multiply the quoted squares by 100 and compare the result with your own measurement. A gap of more than 15% usually means the waste allowance or pitch was assumed differently.
- From House Square Footage: Living area is not roof area. For a single-story home the footprint is close to the living area; for a two-story home divide the living area by two. Then add overhangs and the pitch multiplier before converting to squares.
Squares = (Roof Area / 100) * (1 + Waste Factor)
Bundles = Squares * 3A hip roof measures 2,400 sq ft of sloped surface. 2,400 ÷ 100 = 24 squares. Hip roofs need about 15% waste, so 24 × 1.15 = 27.6, rounded up to 28 squares. With three-bundle shingles that is 84 bundles.
Roofing Squares Examples
Roofers quote and order materials by the square, not the square foot. These examples show how common roof areas convert into squares and bundles once a realistic waste factor is applied.
| Scenario | Calculation | Result |
|---|---|---|
| 1,500 sq ft roof, 10% waste, 3 bundles/square | 1,500 ÷ 100 = 15 raw squares × 1.10 waste = 16.5 | 17 squares → 51 bundles |
| 2,000 sq ft roof, 15% waste, 3 bundles/square | 2,000 ÷ 100 = 20 raw squares × 1.15 waste = 23 | 23 squares → 69 bundles |
| 3,200 sq ft roof, 10% waste, 4 bundles/square (heavy shingles) | 3,200 ÷ 100 = 32 raw squares × 1.10 waste = 35.2 | 36 squares → 144 bundles |
Square Feet to Roofing Squares Chart
Suppliers sell shingles by the bundle, so squares are always rounded up before ordering. Most asphalt shingles come three bundles to the square, which means you can round to the nearest third of a square if you want to trim waste. This table rounds up to whole squares, which is what most crews order.
Use 10% waste for simple gable roofs, 15% for hip roofs, and up to 20% for roofs with several valleys, dormers, or skylights. The roofing waste calculator walks through which allowance applies to your roof.
| Roof Area | Exact Squares | +10% Waste | +15% Waste |
|---|---|---|---|
| 800 sq ft | 8.0 | 9 squares | 10 squares |
| 1,200 sq ft | 12.0 | 14 squares | 14 squares |
| 1,700 sq ft | 17.0 | 19 squares | 20 squares |
| 2,200 sq ft | 22.0 | 25 squares | 26 squares |
| 2,800 sq ft | 28.0 | 31 squares | 33 squares |
| 3,300 sq ft | 33.0 | 37 squares | 38 squares |
Quick facts
- One roofing square represents exactly 100 square feet of surface area.
- A standard bundle of asphalt shingles covers 1/3 of a square (33.3 sq ft).
- Always order a waste buffer (usually 10%–15%) to avoid running short mid-project.
Sources & references
Frequently Asked Questions
Clear answers about roof square footage calculations, pitch slope factors, shingle bundles, and ordering materials.
Divide your total roof surface area in square feet by 100. A 2,000 sq ft roof is 20 squares before waste. Add a 10–15% waste buffer and round up, so 2,000 sq ft becomes about 22–23 squares to order.
One roofing square equals 100 square feet, so square feet ÷ 100 = roofing squares. This calculator does the division for you, applies your chosen waste factor, and rounds up to whole squares because suppliers sell material by the full square.
Most standard architectural shingles come 3 bundles to the square, so each bundle covers about 33.3 sq ft. Heavier or premium shingles can require 4 bundles per square. Select your bundles-per-square above to match your product.
Shingles are sold in whole bundles and material is priced per square, so partial squares always round up. Rounding up also protects you against running short mid-job, which can mean a color-lot mismatch on a second order.
Use about 10% for a simple gable or shed roof, 15% for a standard hip roof, and up to 20% for complex roofs with many valleys, dormers, or hips. The extra material covers trimming, starter courses, and ridge caps.
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