Why Use This Calculator?

✅ Accuracy: Accounts for roof pitch, overhangs, and material waste.
✅ Time-Saving: No manual trigonometry or unit conversions.
✅ Cost-Effective: Avoid overbuying materials or unexpected expenses.
✅ Mobile-Friendly: Works seamlessly on phones, tablets, and computers.

Tips for Best Results

1. Measure Twice: Double-check building dimensions before inputting.

2. Consider Overhangs: Add 0.3–0.5m overhangs for proper rainwater drainage.

3. Check Local Prices: Update the “Price per Meter” field for accurate cost estimates.

4. Consult a Pro: Use results as an estimate – final orders may vary by 5–10%.

Frequently Asked Questions

Q: What’s the standard Mabati sheet width?
A: The calculator defaults to 0.85m effective width (common for corrugated sheets).

Q: How much slope is ideal?
A: 15–30° for most roofs. Steeper slopes (>45°) require special calculations.

Q: What if I don’t know my roof type?
A: Choose “Gable” (most common Kenyan design) or consult a contractor.

Q: Why include wastage?
A: 10% default covers cutting losses and overlaps – adjust based on roof complexity.

Q: Are overhangs mandatory?
A: Recommended for weather protection, but set to 0 if unwanted.

Safety First!

⚠️ Professional Verification Recommended
While this tool provides reliable estimates, always:

• Have measurements verified by a contractor.

• Confirm sheet specs with your supplier.

• Add 5–10% extra materials for complex roofs.