DIY
Calculate Your Roof Pitch
Convert between roof pitch (rise/run), degrees, and percentage. Determine your roof area multiplier.
In this article
Indian Context
Flat roof (RCC slab): Indian standard for urban homes (0-5° slope for drainage)। Sloped: Mangalore tiles need 22°+। Metal roofing: 7°+। Kerala/coastal: steeper slopes for heavy monsoon rain drainage।
Waterproofing
Flat roofs in India NEED waterproofing — monsoon leaks are #1 issue। Slope minimum 1:100 for drainage।
⚡ CalcWolf Insight
Roof pitch affects more than materials — it impacts energy efficiency. Steeper roofs shed snow faster (important in northern climates), create larger attic spaces for insulation, and allow for better ventilation. Flat or low-slope roofs (under 3/12) require special membrane roofing systems instead of shingles.
Frequently asked questions
Indian homes mostly flat?▾
Urban: yes (RCC slab)। South India/hills: sloped (tiles)।
Waterproofing?▾
Essential for flat roofs। ₹20-40/sq ft। Do before every monsoon।
✓ Math logic verified against primary sources
→ See our verification process
