Quality Inspector
Tiles & Flooring
Roof Tile Calculator (2026) – Preset & Custom Tile Estimator
Expert Guide
Professional roof tile estimator for single slope, double slope, and flat roofs with skirting.
⚡ Quick Answer
For a 50m² single slope roof using Clay tiles (15 per m²), you need approx 788 tiles. For flat roofs, the tool automatically calculates the perimeter for skirting tiles.
🛠️ How It Works
- •Choose your tile type (presets auto-fill dimensions) or enter custom specs.
- •Select your roof configuration (Single, Double, or Flat).
- •For flat roofs, enter the skirting height; the tool automatically calculates the perimeter.
- •The tool calculates the net area and applies the wastage factor for final counts.
📐 Calculation Formula
Total Area = (L × W) + [Skirting Area for Flat Roof]
Skirting Area = 2 × (L + W) × Skirting Height
Tiles per m² = 1 / ((Tile L × Tile W) × (1 - Overlap%))
Total Tiles = Area × Tiles per m² + Wastage
📋 Real-Life Example
Example: Flat Roof (10m x 5m) with 150mm skirting.
1. Roof Base Area = 50 m².
2. Perimeter = 2 x (10 + 5) = 30 m.
3. Skirting Area = 30 x 0.15 = 4.5 m².
4. Total Area = 54.5 m².
5. Tiles (Clay) = 54.5 x 15 x 1.05 ≈ 859 tiles.
⚠️ Common Mistakes to Avoid
- ✕Ignoring overlap — roof tiles must overlap to be waterproof; excluding this leads to a 10-20% shortage.
- ✕Forgetting double slopes — many gable roofs are double-sided; ensure you select the correct roof type.
- ✕Underestimating breakage — tiles are fragile; always include at least 5% wastage.
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❓ Frequently Asked Questions
Standard clay tiles (400x250mm) typicaly require 15 pieces per square meter, depending on the overlap used.
Tiles per m2 = 1 / ((Length x Width) x (1 - Overlap%)). Total Tiles = Area x Tiles per m2 x Wastage factor.
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Worth NRs. 5,000
NRs. 999 🎯
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