Paving & Groundwork Calculators

Calculate sub-base, gravel, paving slabs & block paving for UK drives, paths & patios. MOT Type 1 compaction, jointing sand & pattern wastage built in.

Paving
Gravel Tonnage Calculator
Decorative gravel tonnes for driveways and paths at any depth and area.
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Paving
Sub-Base (MOT Type 1)
Hardcore tonnes with 20% wacker-plate compaction factor built in.
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Paving
Paving Slab Calculator
Slab count for any patio area, factoring in joint gaps and wastage.
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Paving
Block Paving Calculator
Block-paving count and bags of kiln-dried jointing sand for any area.
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How these calculators work

Groundwork quantities fail when you order the loose volume and forget that hardcore compacts. Our sub-base calculator builds in a 20% wacker-plate compaction factor for MOT Type 1, so the tonnage you order is the tonnage you need once it's whacked down. The paving and block-paving tools add joint gaps, kiln-dried jointing sand and cutting wastage automatically, and follow BS 7533 guidance on falls and bedding for UK drives and patios.