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Paving Slab Calculator

Estimate paving slabs from area, slab size and waste allowance.

Cuts, breakages, pattern choice and stock pack sizes can change the final quantity.

Notes and next steps

How it works

Estimate paving slab count from area, slab size and waste.

Estimating method: Adjusted area = area × (1 + waste percentage ÷ 100). Slabs = adjusted area ÷ slab area, rounded up.

Worked example

10 m² with 10% waste is 11 m². A 600 × 600 mm slab covers 0.36 m², so buy 31 slabs.

Common mistakes
  • Ignoring laying pattern and cuts.
  • Forgetting breakages and spare slabs.
  • Not checking slab dimensions and joint widths.
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