🟫Paver Calculator

About this tool

Enter the area's length and width, the paver size and joint gap, the waste allowance and the depths of sub-base and sand. The tool shows how many pavers to buy, the volumes and approximate weights of base and sand, and the edging length.

Planning a paved area

Each paver effectively covers its own size plus half the joint on each side, so the count is area ÷ ((length + gap) × (width + gap)). A 4 × 3 m patio in 200 × 100 mm block pavers with 3 mm joints needs about 574, so with 5% extra for cuts and breakages, order 603. Allow 10% or more for herringbone or diagonal patterns and curved edges. Below the pavers goes a compacted sub-base of crushed stone (MOT Type 1 in the UK, crusher run or road base in the US): about 100 mm (4 in) for paths and patios, 150–200 mm for driveways and soft ground. On top sits a bedding layer of sharp sand, usually 25–40 mm. The tool estimates their volumes and weights using typical densities of about 2.1 tonnes per m³ for compacted stone and 1.6 for sand, and the length of edge restraint needed around the perimeter. Honest limits: densities vary with material and moisture, so order a little extra base to allow for compaction; driveways and clay or wet soils may need a deeper base or a membrane. Not building advice. The gravel calculator and the concrete calculator are related.

Frequently asked questions