Patio Calculator

How to Calculate Patio Pavers

Our patio calculator helps you estimate pavers, sand, gravel, and edge restraint for your paver patio project. Accurate calculations help you order the right amount of materials and avoid costly shortages or overages.

Common Paver Sizes

• 6" x 6": Small accent pavers, borders
• 12" x 12": Most popular size, easy to install
• 16" x 16": Good for larger patios, fewer joints
• 24" x 24": Modern look, requires sturdy base

Patio Base Requirements

A proper patio base typically includes 4-6 inches of compacted gravel topped with 1 inch of bedding sand. This creates a stable, well-draining foundation that prevents settling and heaving.

Edge Restraint Options

Edge restraint keeps pavers from shifting outward over time. Options include plastic paver edging, aluminum edging, concrete borders, or existing structures like house foundations or retaining walls.

The Paver Patio Formula

This calculator estimates materials with the following steps:

1. Patio area: length x width in feet
2. Paver coverage: (paver width + joint width) x (paver length + joint width), converted from inches to square feet
3. Paver count: patio area divided by paver coverage, plus 10% waste, rounded up
4. Bedding sand: about 1 ton per 100 sq ft at 1 inch depth (roughly 40 50-lb bags per 100 sq ft)
5. Gravel base: patio area x 4 inches deep, converted to cubic yards, at about 1.4 tons per cubic yard
6. Edge restraint: the perimeter of the patio, (length + width) x 2

Worked Example: 12 x 10 Paver Patio

A 12 ft x 10 ft patio (120 sq ft) using 12" x 12" pavers with standard 1/4" joints:

• Paver coverage with joint: 12.25" x 12.25" = about 1.04 sq ft per paver
• Pavers needed: 120 / 1.04 = 115, plus 10% waste = 127 pavers
• Bedding sand: 120 / 100 = 1.2 tons, or 48 50-lb bags
• Gravel base: 120 sq ft at 4" deep = about 1.5 cubic yards, or 2.1 tons
• Edge restraint: (12 + 10) x 2 = 44 ft

At the 2026 installed range of $8-$35 per sq ft, a 120 sq ft patio runs roughly $1,000 to $4,200 depending on material, region, and site conditions.

Patio Cost Factors and Common Mistakes

Material is the biggest cost factor: poured concrete sits at the low end, concrete pavers in the middle, and natural stone at the top. Cost also varies by region, excavation depth, soil conditions, and how easy the site is to access with equipment.

• Waste factor: 10% covers simple rectangles; curves, circles, and herringbone patterns need 15% or more because of extra cutting
• Pattern choice: larger pavers mean fewer pieces and fewer joints; running bond is the most forgiving pattern for beginners
• Common mistakes: skimping on the gravel base, forgetting the 1/4 inch per foot drainage slope, and ordering the exact paver count with no waste allowance
• Don't skip: polymeric joint sand and edge restraint — both are cheap compared to re-leveling a shifted patio later