Patio Calculator
Calculate the number of pavers and cubic yards of gravel base needed for a patio given its size and paver dimensions.
- Pavers that cover the patio192 pavers · 91%
- Extra for cuts & breakage20 pavers · 9%
About 10% of the order you're buying is pure insurance — for the edge cuts, the mismeasure, and the one paver everyone drops.
- Patio Area192 sq ft
- Gravel Base Needed2.37 cubic yards
About the Patio Calculator
Pavers are sold by the piece, but patios are priced by the square foot — so before you can even call the supplier, you need to convert your patio's footprint into a paver count without over-ordering by half a pallet or, worse, running twenty short with the crew standing around. This calculator does that conversion and adds a waste allowance on top, because straight-edge cuts around the border and the occasional cracked paver are a given, not an edge case.
It's built for the actual shopping trip: punch in the patio dimensions and the size of paver you've picked out, and it tells you how many to buy and how much gravel base to order alongside them, so one trip to the yard covers the whole job.
The gravel figure isn't an afterthought either — a paver patio that skips a proper compacted base is a patio that heaves and settles unevenly within a couple of freeze-thaw cycles, so getting that cubic yardage right matters as much as the paver count itself.
How it’s calculated
The core math is simple division: total patio area divided by the area of a single paver gives the base number of pavers needed to cover the ground with no gaps. A 16×12 ft patio (192 sq ft) tiled with 12×12 in pavers (1 sq ft each) needs 192 pavers before any allowance for waste.
Waste factor gets added on top of that base count, not folded into it — the calculator shows both numbers separately in the breakdown so you can see exactly how many pavers are covering ground versus how many are buffer. 10% is the standard rule of thumb for a simple rectangular layout; bump it toward 15-20% for a herringbone or running-bond pattern, curved edges, or a design with a lot of cuts.
Gravel base volume comes from the same footprint: patio area × the depth of your compacted base layer, converted from cubic inches to cubic yards (the unit most gravel and stone is actually sold in). A typical patio base runs 4-6 inches of compacted gravel, deeper in areas with heavy frost or poor-draining soil.
Frequently asked questions
How many pavers do I need for a 12x16 patio?
It depends on the paver size — divide the patio's area (192 sq ft) by the area of one paver, then add roughly 10% for waste and cuts. For a common 12x12 in (1 sq ft) paver, that works out to about 211 pavers after waste; a smaller 6x9 in paver would need close to 565.
How much gravel base do I need under pavers?
Most residential patios use a compacted gravel base 4-6 inches deep. Multiply the patio's square footage by the base depth, convert to cubic feet, then divide by 27 to get cubic yards — the unit most stone yards sell by.
How much extra should I order for waste?
10% is the standard allowance for a straightforward rectangular patio in a simple running pattern. For diagonal or herringbone layouts, curved borders, or a lot of edge cuts, plan for 15-20% instead — the more cuts a pattern needs, the more full pavers get sacrificed to make them.
Do I really need a gravel base, or can I lay pavers on dirt?
You need a compacted base. Pavers set directly on soil will settle unevenly as the ground shifts, freezes and drains, leading to a wavy, trip-hazard surface within a season or two — the gravel layer (often with a sand setting bed on top) is what keeps the whole patio level over time.
What size pavers should I use for a patio?
Larger pavers (12x12 in or bigger) cover ground faster and need fewer joints, which is easier and cheaper to install; smaller pavers or mixed sizes give more pattern options (herringbone, basketweave) but need more units and generally more waste allowance for the cuts those patterns require.
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