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First-pass estimate — confirm final quantities against your engineer's design.
Plan area
600sq ft
Sloped roof area
630sq ft
Sheets required
20sheets
Live estimate · Prices indicative for Guna district (2026)
Key points
- Slope factor multiplies plan area to get the sloped surface.
Formula & how it works
Sloped area = plan area × slope factor.
Sheets = sloped area × 1.10 (overlap) ÷ sheet area.
Worked example
- 30 × 20 ft plan with 15° slope → sloped ≈ 690 sq ft; 10 × 3.5 ft sheets → 22 sheets.
Expert tips & mistakes to avoid
- Always add a 5–7% wastage buffer — mid-slab shortages cost more than the buffer bags.
- For engineered members (RCC columns/beams), follow the structural drawing over any calculator.
- Order cement in tranches — bags older than 90 days lose strength.
- Confirm the current market rate on WhatsApp before finalising the budget — prices printed here are indicative only.
Frequently asked questions
How much overlap should I plan?
+
About 10% for horizontal + vertical overlaps on trapezoidal profiled sheets.
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