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Patio Calculator: Stone, Base Gravel & Sand

Enter square feet, length × width, or a round patio diameter. Get stone tons, base gravel, bedding sand, weight, pallets, waste, and a material-only cost.

How do I calculate patio materials? Multiply the patio length by its width, add a waste allowance for cuts and breakage, then divide the order area by your supplier's square-feet-per-ton coverage. This calculator does that work and also estimates base, sand, weight, pallets, and stone-only cost.
Materials Flagstone Cost Estimate

Enter Your Measurements

Hardscape Genius

Your estimate is only step one.

The calculator tells you how much to order. Hardscape Genius helps you decide where each irregular stone should go after delivery, before the crew starts dragging pieces back and forth from the pallet.

  • AI reads exact measurements from photos
  • Drag-and-drop layout on phone or tablet
  • Works during lunch break after delivery

Try it on a real job

Best fit: you have stone arriving soon, a photo of irregular pieces, or a crew that needs a clear layout plan before installation starts.

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No card required. The trial begins after your first successful stone processing.

How This Calculator Works

  1. 1 Enter area directly, use length by width, or enter a round patio diameter
  2. 2 Choose the stone, then replace the starting coverage with supplier data
  3. 3 Adjust thickness, waste, pallet weight, price, base, and sand assumptions
  4. 4 Get instant estimates for all three material layers

Ordering Tips

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Waste is editable. Set an allowance for cuts, breakage, package rounding, and useful spare pieces.

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Compaction assumption. Gravel and sand results use a disclosed 30% loose-material allowance. Confirm it with the supplier.

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Verify with supplier. Always confirm quantities with your local stone yard before ordering.

Your project, routed by what happens next

Where are you in the patio project?

Choose the closest stage. The article and calculators stay completely free and available.

01 I’m choosing a material

Compare cost, upkeep, climate fit, and appearance before you commit.

Compare flagstone, bluestone, and pavers Email me the free decision report
02 I need to know how much to order

Calculate stone, base gravel, and bedding sand without giving up your contact details.

Calculate my material order Check a stone waste allowance
03 My stones are delivered

Use one non-renewing Project Pass for this DIY job, or begin in the no-card planner.

Choose the DIY Project Pass Use the no-card planner instead
04 I want someone to plan or install it

Have an experienced stonemason design the layout for your actual stones, or use the field guide with an installer you choose.

See the Patio Design Service Use the DIY layout guide

Guide to Patio Material Calculations

Why Use a Patio Calculator?

Planning a patio or walkway project requires accurate material estimates to avoid costly overordering or project delays from underordering. This free patio material calculator creates a planning estimate for flagstone, bluestone, granite pavers, base gravel, and bedding sand. The supplier's coverage, package, and delivery rules control the final order.

Understanding Patio Base Materials

A proper patio installation requires three layers: compacted base gravel for drainage and stability, bedding sand for leveling, and your chosen paving stones on top. The base gravel depth typically ranges from 4-6 inches for patios and walkways, while driveways require 6-8 inches for heavier loads.

Our calculator automatically accounts for the compaction factor (30% additional material needed) since loose gravel compresses during installation. This ensures you order enough material for a solid, long-lasting base.

Choosing Between Flagstone, Bluestone, and Pavers

Different stone types have varying coverage rates and characteristics:

  • Flagstone: Irregular natural stone, approximately 100 sq ft per ton, ideal for organic patio designs
  • Bluestone: Dense, durable stone with consistent thickness, popular for formal patios
  • Granite pavers: Extremely hard and weather-resistant, excellent for high-traffic areas
  • Limestone: Softer stone with warm tones, best for sheltered patio areas
  • Concrete pavers: Cost-effective manufactured option with precise dimensions

Calculating Sand and Gravel Quantities

To calculate cubic yards of base gravel: multiply your patio area (in square feet) by the depth in inches, divide by 12 to get cubic feet, then divide by 27 to convert to cubic yards. Remember to multiply by 1.3 for the compaction factor.

For bedding sand, use the same formula with your sand depth (typically 1 inch). Professional installers recommend ordering slightly more than calculated to ensure you have enough material for proper compaction and leveling.

Reducing Material Waste

Irregular stone is easier to use efficiently when you can see the available shapes before cutting. A digital layout helps you compare placements, preserve useful offcuts, and decide which cuts are actually necessary before changing the real material.

Ready to design your layout? Our step-by-step guide shows you how to photograph your stones, arrange them digitally, and see exactly how they'll fit together before you start building.

Frequently Asked Questions

How do I calculate patio materials?

Multiply patio length by width to get area, add your chosen waste allowance, then divide the order area by the supplier's square-feet-per-ton coverage. Use the selected depths to calculate base gravel and bedding sand.

How do I calculate the square footage of a patio?

Multiply the length by the width in feet. A 12x16 patio is 192 square feet and a 16x20 patio is 320 square feet. For a round patio, multiply 3.14 by the radius squared. Break L-shaped or irregular patios into rectangles and add them together.

How many stones do I need for a 10x10 patio?

A 10x10 patio covers 100 square feet. For flagstone, you'll need approximately 1-1.25 tons of stone. For standard 12x12 inch pavers, about 100 pavers. Always order 10-15% extra for cuts, breakage, and fitting around edges.

How much gravel do I need for a patio base?

Use 4-6 inches of compacted gravel for a patio base. Multiply your patio area by the depth in inches, divide by 12 for cubic feet, then by 27 for cubic yards, and add 30% for compaction. A 100 sq ft patio with a 4-inch base needs about 1.6 cubic yards of gravel.

What is the best stone for a patio?

Flagstone offers natural beauty ideal for organic designs. Bluestone is extremely durable for formal settings. Granite is the most weather-resistant. Limestone provides warm tones but requires sealing. Consider your local climate and maintenance preferences when choosing.

How thick should a patio base be?

4 inches of compacted gravel for walkways and light-use patios, 6 inches for standard patios and sitting areas, and 8+ inches for driveways. Add 1 inch of bedding sand on top. Proper base depth prevents settling and ensures drainage.

How much sand do I need under patio stones?

A 1-inch layer of bedding sand under patio stones. Multiply your patio square footage by 1 inch, divide by 12 for cubic feet, then by 27 for cubic yards. A 100 sq ft patio needs about 0.3 cubic yards (roughly 0.5 tons) of sand.

Calculate Materials by Patio Size

Planning a specific patio size? Jump directly to pre-filled calculators for common dimensions:

Round Patio Calculator

Planning a circular patio or fire pit area? Calculate materials using: Area = π × (diameter ÷ 2)²