Calculate how many pavers you need for a patio or walkway, plus the sand bedding layer and gravel base layer typically needed underneath.
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The paver count itself uses the same basic math as our indoor Tile Calculator, area divided by unit size plus a waste allowance, but this calculator is purpose-built for outdoor hardscaping, additionally estimating the two prep layers a paver installation needs underneath: a compacted gravel base (commonly 4-6 inches, providing drainage and load support) and a leveling sand bedding layer (commonly 1 inch, providing a smooth, adjustable surface to set pavers into).
Skipping or under-building the gravel base and sand bedding is one of the most common causes of pavers shifting, sinking or becoming uneven over time, especially in areas with freeze-thaw cycles or poor natural drainage. Getting these layers right upfront saves significant rework later.
For a 15 ft × 10 ft patio (150 sq ft) using 12 in × 12 in pavers (1 sq ft each), 10% waste, 1 in sand bedding and 4 in gravel base: the 'Patio Area' result shown is the raw, pre-waste figure, 150 sq ft. Internally, the calculator also adds waste (150 × 1.10 = 165 sq ft) to determine the paver count, but that waste-adjusted figure isn't itself shown as a separate result, only the final paver count reflects it: 165 ÷ 1 = 165 pavers exactly (with this specific 1 sq ft paver size, the paver count and the internal waste-adjusted area happen to be the same number, that won't generally be true for other paver sizes). Sand needed = 150 × (1 ÷ 12) = 12.5 cu ft. Gravel base needed = 150 × (4 ÷ 12) = 50 cu ft.
Reading the 'Patio Area' result as if it already includes the waste allowance, it doesn't, it's the raw pre-waste area, the waste adjustment is applied internally only to compute the paver count, not shown as its own separate figure.
Skipping or under-building the gravel base and sand bedding layers, this is one of the most common causes of pavers shifting, sinking or becoming uneven over time, especially with freeze-thaw cycles or poor drainage.
Using the same depth assumptions for every project, sand bedding and especially gravel base depth needs vary by soil stability and whether the area sees vehicle traffic, the 1 in / 4 in defaults suit a typical pedestrian patio, not every situation.
A paver patio isn't just the visible pavers, it's a layered system: compacted gravel base, sand bedding, then the pavers themselves. Estimating all three layers upfront gives a complete materials picture for the project, not just the pavers.
4 inches is a common minimum for pedestrian patios and walkways in stable soil; areas with vehicle traffic, poor drainage, or freeze-thaw climates often need a deeper base, 6 inches or more. Check local guidance for your specific soil and climate conditions.
Yes, the same length x width area math applies to a walkway, just enter its length and width like any other rectangular area.
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