Free Paver Calculator – Pavers, Base & Sand Quantities

Paver, Base & Joint Sand Calculator Guide

The Paver Calculator estimates four quantities for a patio, walkway, or driveway: the number of pavers, the cubic yards of compacted gravel sub-base, the cubic yards of bedding sand, and the bags of polymeric joint sand. Start by measuring the finished surface area in square feet (or square meters); for L-shaped or curved layouts, split the area into rectangles, total them, and round generously around curves. Enter the area of a single paver, taken from its actual face dimensions, not the nominal name. Then set two depths: the gravel base depth and the sand setting-bed depth. A typical pedestrian patio uses a 4 inch base over stable soil, while a driveway carrying vehicle loads needs 6 to 8 inches or more, and clay or poorly draining soils call for a thicker base. The bedding sand layer is almost always 1 inch. Finally choose a waste percentage based on your laying pattern, since angled patterns generate far more cut-off than straight ones.

Paver count = round up of (area / single-paver area) x (1 + waste/100). A common 4 x 8 inch paver covers 32 sq in, or about 0.22 sq ft, so a 100 sq ft patio is 100 / 0.22 = 455 pavers; at 10% waste that is about 500 pavers. Base and bedding both use volume: cubic yards = area (sq ft) x depth (in) / 12 / 27. For the same 100 sq ft patio, a 4 inch gravel base is 100 x 4 / 12 / 27 = 1.23 cubic yards, and a 1 inch sand bed is 100 x 1 / 12 / 27 = 0.31 cubic yards. Polymeric joint sand is sold by the bag, with one 50 lb bag filling roughly 65 sq ft of standard narrow joints, so 100 / 65 rounds up to 2 bags. Wider joints or thicker pavers consume sand faster, so treat that coverage as a mid-range estimate.

Pattern drives paver waste more than any other factor. A 45 degree herringbone can lose up to 15% to diagonal perimeter cuts, while running bond, basket weave, and stack bond typically need only about 5%, so match the waste percentage to your actual layout instead of a single default. Always buy roughly 10% extra and keep the leftovers, because pavers vary slightly in color between production runs and a future repair will not match a later batch. The base is structural: most segmental paving guidance, including ICPI installation practice, calls for placing the gravel in compacted lifts of no more than about 4 inches, and using a geotextile over soft soils to keep the base from sinking into the subgrade. Maintain a finished surface slope of about 1 to 2% (roughly 1/4 inch per foot) away from structures for drainage. Sweep and mist polymeric sand to activate it, and never substitute plain mason's sand in the joints, since it washes out and invites weeds.