How to Calculate How Many Shingles You Need

Measure your roof area in square feet, then divide by 100 to get the number of "squares." Multiply by 3 (for standard shingles) to get bundles. Add 10–15% for waste, cuts, and starter shingles. A typical 1,500 sq ft bungalow in Ontario has about 1,800 sq ft of actual roof surface (accounting for slope) — that's 18 squares × 3 = 54 bundles, plus 6–8 bundles waste = 60–62 bundles total. (Serving Milton, Ontario.)

How Many Shingles in a Bundle? Ontario Guide 2026 | Milton

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