16x20 Patio Calculator

16 × 20 = 320 square feet (about 29.7 m²). Building a patio this size? Plan on roughly 3.2-4 tons flagstone and ~5.1 cubic yards (4" base, incl. compaction). The calculator below refines it for your stone.

A 16x20 patio offers 320 square feet - perfect for those who love to entertain outdoors.

Dimensions

16' x 20'

Area

320 sq ft

Size Category

Large

Materials Flagstone Cost Estimate

Calculate Materials for Your 16x20 Patio

Patio Area (square feet)

Pre-filled for 16x20 (16' x 20'). Adjust if needed.

Stone Type

Material Requirements

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Still shopping Compare local material or install options Carry your area and stone choice into the cost and local-match form. Stones are ready Plan it yourself — $29 Use one non-renewing Project Pass for this DIY job, or begin in the no-card planner. Want an expert plan Have James design it — $149 Have an experienced stonemason design the layout for your actual stones, or use the field guide with an installer you choose.

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About 16x20 Patio Patios

A 16x20 patio offers 320 square feet - perfect for those who love to entertain outdoors.

What a 16x20 Patio is Great For

Full outdoor living room
Outdoor kitchen with island
Multiple seating areas
Pool deck with lounging space

Design Tips for 16x20 Patios

Plan for multiple activity zones
Consider adding a shade structure or pergola
Great size for a built-in outdoor kitchen

Quick Material Estimates

Stone (Flagstone)

3.2-4 tons flagstone

Base Gravel

~5.1 cubic yards (4" base, incl. compaction)

* Estimates vary by stone type. Use the calculator above for precise quantities.

Design First, Order Less

People typically over-order stones for a 16x20 patio. Design your layout digitally to know exactly what you need.

Upload photos of your actual stones
Arrange them to fit perfectly
Order only what you need

Plan My Delivered Stones

Other Patio Sizes

Small

Medium

Large

Extra Large

Material Tips

Base: Provides drainage and stability

Sand: Creates level surface for stones

Waste: 10% extra included for cuts and breakage

Related Resources

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

16x20 Patio Patio FAQ

How many square feet is a 16x20?

A 16 by 20 foot area is 320 square feet (16 × 20 = 320), or about 29.7 square meters.

How much stone do I need for a 16x20 patio?

A 16x20 patio covers 320 square feet. For flagstone, you'll need approximately 3.2-4 tons flagstone. For standard pavers, calculate based on paver size. Always order 10-15% extra to account for cuts and breakage.

How much gravel do I need for a 16x20 patio base?

For a 16x20 patio (320 sq ft) with a standard 4-inch base, you'll need ~5.1 cubic yards (4" base, incl. compaction), already including the 30% compaction allowance. Use 6 inches of base for heavy-use areas or clay soil.

What furniture fits on a 16x20 patio?

A 16x20 patio (320 sq ft) is ideal for: Full outdoor living room, Outdoor kitchen with island, Multiple seating areas, Pool deck with lounging space. Consider your primary use when planning furniture placement.

Is a 16x20 patio big enough?

A 16x20 patio provides 320 square feet of outdoor living space. This is considered a large patio. A 16x20 patio offers 320 square feet - perfect for those who love to entertain outdoors. The right size depends on your intended use and available space.