Roofing Calculators
Roofing Squares Calculator
Convert your roof area to roofing squares with adjustable waste factor and optional pitch multiplier. Find out exactly how many squares of material you need.
Enter Roof Area
Results update automatically as you change inputs.
Your Roof Is
21.56
Roofing Squares
1 square = 100 ft² (9.29 m²)
Roof Area (as entered)
2,000.00 ft²
Sloped Area
2,108.13 ft²
After pitch multiplier
Area with Waste (10%)
2,318.94 ft²
Bundles Needed
66
3 bundles per square (standard shingles)
Pitch Multiplier
1.0541
Area Increase
+5.41%
Squares Visualization
Each coloured block represents 1 roofing square (100 ft²). Partial squares are shown with reduced opacity.
Calculation Breakdown
What Is a Roofing Square?
The Basics
- ■ 1 roofing square = 100 square feet (approximately 9.29 square metres)
- ■ Roofing materials (shingles, tiles, metal sheets) are sold by the square
- ■ This unit simplifies ordering — instead of saying 2,500 sq ft, you say 25 squares
Why Add Waste Factor?
- ■ Cuts and trimming — material lost at edges, hips, and valleys
- ■ Overlaps — shingles and tiles overlap, reducing effective coverage
- ■ Breakage — tiles and shingles can crack during handling
- ■ Spare stock — always keep extras for future repairs
Recommended Waste by Roof Type
| Roof Type | Recommended Waste | Why |
|---|---|---|
| Simple Gable | 10% | Minimal cuts, straight edges |
| Hip Roof | 15% | Angled cuts along hip ridges |
| Complex / Multi-Valley | 20–25% | Many cuts, valleys, dormers |
| Mansard / Gambrel | 15–20% | Multiple slope transitions |
Roof Area Calculator
Calculate true sloped roof area from building dimensions and pitch. Get results in square feet, square metres, and roofing squares.
Calculate Roof Area →Roof Pitch Calculator
Find your roof pitch from rise and run measurements. Get pitch ratio, degrees, and slope percentage.
Calculate Roof Pitch →All Roofing Calculators
Browse our full suite of free roofing calculators for every roof type and measurement need.
View All Calculators →Frequently Asked Questions
Common questions about roofing squares and material ordering
What is a roofing square?
A roofing square is a standard unit of measurement used in the roofing industry. One roofing square equals 100 square feet (approximately 9.29 square metres) of roof area. Roofing materials such as shingles, tiles, and metal sheets are typically priced and sold by the square.
How do I calculate roofing squares from square feet?
Divide your total roof area in square feet by 100. For example, a 2,000 sq ft roof equals 20 roofing squares. If your area is in square metres, first multiply by 10.764 to convert to square feet, then divide by 100. Our calculator does this automatically for both units.
How much waste factor should I add?
For simple gable roofs, add 10% waste. For hip roofs with more cuts, add 15%. For complex roofs with valleys, dormers, and multiple planes, add 20-25%. The waste accounts for material lost to cuts, overlaps, and damaged pieces during installation.
Why can't I just divide my roof area by 100?
Dividing by 100 only works if your area is already the true sloped area in square feet. If you measured from a floor plan or satellite image, that is the footprint (flat) area. You need to multiply by the pitch multiplier first to get the actual sloped area before converting to squares.
How many bundles of shingles are in a roofing square?
For standard three-tab and most architectural shingles, 3 bundles cover one roofing square (100 sq ft). Some heavier architectural or specialty shingles may require 4-5 bundles per square. Always check the manufacturer's specifications for the exact coverage per bundle.
Ready to Order Materials?
Now you know your roofing squares. For a professional quote including materials and installation, contact our team.