A **roofing square** is the industry standard measurement for roofing materials, equal to 100 square feet of roof surface coverage. Understanding this conversion is essential for accurate material ordering. **Basic formula:** Squares = Roof Area ÷ 100 **Calculation example:** - 1,000 sq ft ÷ 100 = 10 squares (exact) - 1,118 sq ft ÷ 100 = 11.18 squares = 11 full squares + 18 sq ft remainder **Three key outputs this calculator provides:** 1. **Squares (decimal)** - The exact mathematical calculation 2. **Squares (rounded up)** - Number of complete squares you must order (rounded up because partial squares cannot be purchased) 3. **Remainder** - Leftover square footage after accounting for complete squares **Important:** When ordering materials, always order the rounded-up number of squares. The remainder can be covered with partial bundles or leftover material from the last square. Add an additional 10-15% contingency for waste, cuts, and overlap when ordering.