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Paver Patio Calculator: Estimate Interlocking Pavers, Bedding Sand, and Polymer Sand

Enter your patio size and paver type to get a real-time estimate of pavers needed, bedding sand tonnage, and polymeric joint sand bags. No buttons - results update instantly.

Patio Details

Select your patio shape and enter dimensions

Units

Patio Length

Patio Width

Paver Size

Waste Factor 10%

0%5%10%15%20%

Total Pavers Needed

Pavers

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Bedding Sand (1" Layer)

Tons

- cu yds / - cu ft

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Polymeric Joint Sand

50 lb Bags

- sq ft coverage rate

Estimates only. Results are based on standard industry formulas and nominal paver dimensions. Actual quantities may vary based on paver manufacturer specs, joint width, site conditions, and installer preference. Always add a buffer and consult your supplier before purchasing materials. This tool is not affiliated with any paver manufacturer or supplier.

Key Terms Explained

Interlocking Paver

A precast concrete or clay unit designed with edges that lock against neighboring pavers when installed. The interlocking system distributes loads across multiple pavers, allowing the surface to flex slightly under freeze-thaw cycles without cracking.

Polymeric Sand

A joint-filling material made from graded fine sand blended with polymer binders. When activated with water, the binders harden the sand into a stable, cohesive joint that resists washout, weed growth, and insect intrusion.

Bedding Sand (Concrete Sand)

Coarse, angular sand - typically ASTM C33 concrete sand - spread in a 1-inch uncompacted layer directly beneath the pavers. Its angular particles resist compaction and provide a screenable surface for precise grade adjustment.

Sub-base (Gravel)

The compacted crushed stone layer below the bedding sand, typically 4 to 8 inches deep. It provides structural support, prevents settling, and allows water to drain away from the paver system.

Screeding

The process of dragging a straight board or pipe across the top of the bedding sand layer to create a smooth, uniformly graded surface before laying pavers. Proper screeding is essential for a flat, rocking-free finished patio.

Compaction

The mechanical process of using a plate compactor or hand tamper to increase the density of sub-base gravel, bedding sand, or the finished paver surface. Each layer must be compacted to the correct density before the next layer is installed.

Edge Restraint

A plastic, aluminum, or concrete border installed around the perimeter of a paver surface and spiked into the ground. Edge restraints prevent the outer pavers from creeping outward over time, which would cause the entire interior pattern to loosen.

Waste Factor

An added percentage of material to account for edge cuts, pattern offcuts, and broken or rejected pavers. Standard practice is 5 to 10 percent for simple rectangular patios, and 10 to 15 percent for diagonal or herringbone patterns with many angled cuts.

The Complete Guide to Planning a Paver Patio

Installing an interlocking paver patio is one of the most durable and DIY-friendly hardscaping projects a homeowner can take on. But the math behind estimating materials is deceptively easy to get wrong - especially when it comes to the sand layers, which are often overlooked until you are already at the supplier. This guide walks through exactly what you need, why each component matters, and how to use the calculator above to build an accurate materials list before you spend a dollar.

How to Use This Calculator

Start by choosing your patio shape. If you have a straightforward rectangular patio, enter the length and width in feet or meters. If your patio is an irregular shape, measure the total surface area yourself (or use a landscaping app) and enter the square footage directly using the Custom Area option.

Next, select the paver size that matches the product you plan to buy. The size affects two calculations: the total paver count (smaller pavers mean more individual units) and the polymeric sand coverage (smaller pavers have more joint area per square foot, so they consume more bags of polymeric sand). Set the waste factor slider to 10 percent for a standard rectangular patio. If you are cutting a diagonal or herringbone pattern, bump it up to 15 to 20 percent. All results update in real time as you adjust any input.

Understanding the Three Material Estimates

The primary output is the total paver count, already adjusted for your waste factor. This is the number of individual paver units to order. Pavers are typically sold by the pallet, so divide this number by the pallet quantity shown on your supplier's product sheet to get the number of pallets to request.

The bedding sand estimate is calculated using the industry standard of 1 inch of uncompacted coarse concrete sand. The result is shown in both tons and cubic yards because suppliers sell bedding sand by weight (tons) while it is easier to visualize in volume (cubic yards). Use the tonnage figure when ordering from a bulk supplier; 1 cubic yard of concrete sand weighs approximately 1.35 tons. Note that this estimate covers only the 1-inch bedding layer - your gravel sub-base is a separate, larger material order not covered here.

The polymeric joint sand estimate is based on industry coverage rates that vary by paver size. Smaller pavers have more linear joints per square foot, which means they consume more polymeric sand per square foot of patio. A 50 lb bag of polymeric sand covers roughly 50 sq ft with 4x8 inch pavers, 60 sq ft with 6x6 inch pavers, 80 sq ft with 12x12 inch pavers, and up to 120 sq ft with large 24x24 inch slabs. The calculator rounds up to the nearest whole bag, since partial bags cannot be returned once activated.

The Standard Paver Installation Stack

A properly built paver patio is a layered system, installed from the bottom up. The excavated grade is first covered with 4 to 8 inches of compacted 3/4-inch crushed gravel sub-base. This is where most of the structural work happens - the sub-base distributes load, resists frost heave, and provides drainage. On top of the compacted sub-base goes the 1-inch bedding sand layer, screeded flat. The pavers are then set into the sand and the entire surface is compacted with a plate compactor. Polymeric sand is swept into the joints, a final light compaction pass locks everything in, and then the surface is wetted to activate the polymer binders.

Frequently Asked Questions

Why do I need a 1-inch sand bedding layer under my pavers? ▼

The 1-inch uncompacted coarse concrete sand bedding layer serves three critical purposes. First, it provides a screenable surface that lets you fine-tune the final grade so every paver sits at exactly the right height and pitch. Second, coarse concrete sand - also called ASTM C33 sand - is angular and does not compact under the pavers the way fine play sand would, so it keeps the surface stable over time. Third, it allows water that permeates the joints to drain down and away. The 1-inch depth is an industry standard: less than 1 inch gives you almost no leveling ability, while more than 1.5 inches can allow pavers to shift and rock underfoot.

What is polymeric sand and why is it better than regular sweeping sand? ▼

Polymeric sand is a blend of fine sand and polymer additives. When swept into the joints between pavers and activated with water, the polymers bind the sand into a semi-rigid, hardened joint filler. Regular sweeping sand washes out in heavy rain, blows away in wind, and shifts over time, leaving open joints that allow weeds to germinate and ants to colonize. Polymeric sand resists erosion, inhibits weed growth, deters insects, and prevents joint loss. It comes in multiple colors to complement different paver tones. The tradeoff is higher cost and proper installation requirements - pavers must be dry when the sand is swept in, and it must be wetted carefully to activate the binders without washing them out.

How deep should my crushed gravel sub-base be for a standard patio? ▼

For a residential patio carrying foot traffic and light furniture, the standard sub-base depth is 4 to 6 inches of compacted 3/4-inch crushed stone, also called crusher run. In areas with expansive clay soils, heavy frost depth, or significant tree roots, 6 to 8 inches is recommended. Driveways that carry vehicle loads need a minimum of 6 to 12 inches. The sub-base is the most important structural component of a paver installation - a thin sub-base is the top cause of sunken, heaved, or rocking pavers after freeze-thaw cycles. This calculator handles bedding sand and paver counts; use a separate gravel calculator to size your sub-base material order.

Do I really need to use a plate compactor on the finished patio? ▼

Yes. Final compaction with a plate compactor is a required step in a quality interlocking paver installation. After all pavers are laid and polymeric sand is swept in for the first pass, running the compactor over the surface drives each paver into the bedding sand, locks the surface to a consistent final height, and ensures the polymeric sand settles fully into the joints. Without this step, pavers shift and settle unevenly under foot traffic and the polymeric sand will not lock as effectively. Use a rubber paver pad on the compactor plate to prevent scratching decorative surfaces. Run the compactor in two passes - straight across the patio and then at 45 degrees - for the most even result.