Paving & Groundwork Calculators
Calculate sub-base, gravel, paving slabs and block paving for UK drives, paths and patios. Our groundwork calculators build in MOT Type 1 compaction, jointing sand and pattern wastage so the quantities you order match what the job actually needs.
Paving
Gravel Tonnage Calculator
Decorative gravel tonnes for driveways and paths at any depth and area.
Paving
Sub-Base (MOT Type 1)
Hardcore tonnes with 20% wacker-plate compaction factor built in.
Paving
Paving Slab Calculator
Slab count for any patio area, factoring in joint gaps and wastage.
Paving
Block Paving Calculator
Block-paving count and bags of kiln-dried jointing sand for any area.
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.