Roofing measured in squares (100 sq ft). Pitch affects actual area. One square equals 3 bundles of shingles. Add 10% waste, more for complex roofs with valleys and dormers. Include underlayment, starter strips, and ridge caps.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
One square equals 100 square feet of roof area.
Steeper roofs have more surface area: 6/12 pitch adds ~12%, 12/12 adds ~41%.
Standard 3-tab and architectural shingles: 3 bundles per square.