This calculator is only an estimation tool meant to help you approximate the quantity of shingles required.
It is not a guarantee of final volume.
Specific construction details—such as valleys, broken hips, ridges, steep pitches, or unusual roof shapes—must always be evaluated by your installer or roofing professional.

For a standard installation, we consider a 50% overlap on the outer (first) layer.
Different overlaps (e.g., 40% or 60%) will directly change the total quantity of shingles required.

Our shingle calculator factors in:

✅ Number of installation layers (2-layer or 3-layer)
✅ Floor area or direct roof area
✅ Automatic roof area estimation (+40% from floor area)
✅ Pieces required per m² (95 pcs for 2 layers, 105 pcs for 3 layers)
✅ Conversion into ikat bundles (1 ikat = 80 pcs)

With just a few inputs, you’ll receive an estimated shingle quantity and total ikat needed—helping you plan your purchase efficiently while avoiding unnecessary waste.