Paver Patio Calculator
Adjust the parameters below to compute materials and estimate project costs.
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Breakdown Details
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Guidelines & Field Recommendations
• Lay exactly 1 inch of bedding sand (do not compact until blocks are laid).
• Subbase: 4 inches compacted gravel for patios, 6-8 inches for driveways.
Edge Restraints: Install plastic or concrete edge restraints to prevent lateral shifting.
Calculation Formulas & Steps
Pavers needed = Area (sq in) ÷ Paver Size (sq in) × 1.10 (waste). Sand Base (1" depth) and Gravel Sub-Base (4" depth) are calculated using volume formulas.
Worked Example (Step-by-Step Math)
Multiply length and width.
15 ft × 10 ft = 150 sq ft = 21,600 sq inDivide patio area by single paver area (6x9 = 54 sq in), then add 10%.
(21,600 ÷ 54) × 1.10 = 440 paversSand requires 1" base, gravel sub-base requires 4".
Gravel: 150 sq ft × (4/12) ft ÷ 27 × 1.10 = 2.04 cu ydPaver Laying Layer Specs
Cross-section of a durable paver installation.
| Project Condition | Reference Metric |
|---|---|
| Top Paver Blocks | 2" to 2.5" thick paving stones |
| Bedding Sand Base | 1 inch of coarse concrete sand (do not compact until blocks are laid) |
| Sub-Base Gravel | 4 inches (pedestrian) to 6 inches (driveways) compacted crusher run |
Critical Mistakes to Avoid
- !Mistake 1: Using fine play sand for the bedding layer instead of coarse concrete sand, causing pavers to shift.
- !Mistake 2: Not installing solid edge restraints, letting outer pavers migrate outwards.
Frequently Asked Questions
How much bedding sand should be placed under pavers?
You should lay exactly 1 inch of bedding sand directly under pavers. Laying it thicker than 1 inch will cause the sand to shift and create dips or waves in your patio surface. Note: Bedding sand should be coarse concrete sand (sharp edges), not smooth play sand.
What is the recommended depth of crusher run gravel base for a paver walkway?
For pedestrian walkways and patios, a minimum depth of 4 inches of compacted crushed run gravel (also known as QA or ABC stone) is recommended. For driveways or areas with vehicle traffic, increase this base gravel depth to 6 to 8 inches to withstand heavy loads.
Can you lay pavers directly on top of concrete?
Yes, this is called an overlay. You can lay pavers on an existing concrete patio if the concrete is stable and has a proper slope for drainage. Install a thin 1/2-inch sand bedding layer or use mortar/adhesive on the borders to keep pavers secure.
How can I stop pavers from sinking or shifting over time?
The key to preventing paver sinking is proper excavation and subbase compaction. Dig out all soft organic topsoil, lay a geotextile fabric, lay 4 inches of crusher run gravel, and compact it in 2-inch layers using a vibrating plate compactor before screeding bedding sand.
How many pavers do I need to buy for a 10x12 patio?
A 10x12 patio is 120 sq ft. If using standard 6x9 pavers, you need 320 pavers. Add a 10% waste buffer for cutting border blocks, bringing the purchase total to 352 pavers.
What is polymeric joint sand and why is it used?
Special sand mixed with water-activated polymers that dries hard. Swept into joints, it locks pavers together, drains surface water, and blocks weeds/ants.
Should I compact the bedding sand before laying pavers?
No. Screed the bedding sand flat, but leave it loose. Lay the pavers directly on the loose sand, and then run a plate compactor over the finished pavers to set them into the sand bed.
Complete Tools Checklist
- Rubber Mallet
- Plate Compactor
- Screed Pipes
- Line Level
- Broom