🏠 Roofing Calculator
Calculate materials for flat, sloped, hip, and gable roofs. Estimate shingles, metal sheets, and concrete slab quantities.
📐 Roof Details
Higher pitch = more roofing material
Extension beyond the wall for protection
Optional: Enter to calculate cost
Wastage Factor: Results include 10% extra for waste, overlaps, and cutting.
RCC: Concrete volume includes 5% wastage
Roof Area
0
sq ft (including waste)
Material Cost
₹ 0
excluding labor
RCC Slab Details
Concrete
0 m³
Steel
0 kg
Cement
0 bags
Metal Roofing Details
Metal Sheets
0
8 ft sheets (3 ft coverage)
Ridge Cap
0 ft
For ridge/hip lines
Shingle Roofing Details
Shingle Bundles
0
3 bundles = 1 square (100 sq ft)
Underlayment
0 sq ft
Felt paper / synthetic
Tile Roofing Details
Tiles Needed
0
Standard tiles (approx. 10/sq ft)
Battens
0 ft
For tile fixing
Results include 10% extra for waste, overlaps, and cutting. Always add additional 5-10% for contingencies.
🏠 Roofing Guide
RCC slab with waterproofing. Best for terraces and modern buildings. Requires proper drainage.
Metal sheets or shingles. Allows water runoff, good for rainy areas. Pitch factor increases material.
More complex design, requires 10-15% extra material. Better wind resistance and aesthetic appeal.
📊 Roof Pitch Factors
| Pitch (rise/run) | Angle | Multiplier | Description |
|---|---|---|---|
| 1/12 | 4.8° | 1.02 | Very low slope |
| 3/12 | 14.0° | 1.08 | Low slope |
| 4/12 | 18.4° | 1.12 | Standard residential |
| 6/12 | 26.6° | 1.20 | Common pitch |
| 8/12 | 33.7° | 1.30 | Steep slope |
| 10/12 | 39.8° | 1.41 | Very steep |
| 12/12 | 45.0° | 1.62 | Extreme slope |
💰 Material Cost Estimates (per sq ft)
- RCC Slab: ₹65-85 (including steel, concrete, shuttering)
- Metal Sheets: ₹45-70 (CGI/GI sheets with accessories)
- Asphalt Shingles: ₹50-90 (with underlayment)
- Clay/Concrete Tiles: ₹80-150 (premium roofing)
❓ Frequently Asked Questions
How do I calculate roof area for a pitched roof?
Multiply the floor area (length × width) by the pitch factor. For example, a 1000 sq ft floor with 6/12 pitch (1.20 factor) gives 1200 sq ft of roofing material needed.
How many shingle bundles do I need?
Three bundles of asphalt shingles cover 100 sq ft (1 square). Divide your total roof area by 100 and multiply by 3. Add 10% for waste.
What's the difference between hip and gable roof?
Hip roof has slopes on all four sides, requiring 15% more material. Gable roof has two sloping sides with vertical ends, requiring 10% more material than a basic pitched roof.
⚠️ Disclaimer: This calculator provides estimates for planning purposes. Actual material requirements may vary based on roof complexity, local building codes, and installation method.