Pea Gravel Patio Calculator
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Formulas verified against USGS, NRMCA & ASTM primary sources. Methodology · Last updated May 2026
A pea gravel patio is one of the most cost-effective weekend projects you can build. The standard depth is 2–3 inches over a 2-inch compacted base. Two calculators below — rectangular for standard patios, circular for fire-pit pads and round seating areas.
Rectangular Patio
Cubic Feet
— ft³
Cubic Yards
— yd³
Weight (lbs)
— lb
Weight (tons)
— tons
Bags (50 lb)
— bags
Estimated Cost
—
Circular Patio — Fire-Pit Pad or Round Seating Area
Cubic Feet
— ft³
Cubic Yards
— yd³
Weight (lbs)
— lb
Weight (tons)
— tons
Bags (50 lb)
— bags
Estimated Cost
—
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How to Build a Pea Gravel Patio — Step by Step
- Mark the area. Use a garden hose or marking spray for curves. Allow at least 10×10 ft for a two-chair seating area, 12×14 ft for a dining table with chairs, 18-ft diameter for a fire-pit zone with chairs around it.
- Excavate 5 inches below final grade. Remove all sod, topsoil, and organic material. The finished patio surface should sit level with or slightly above the surrounding lawn — not sunken.
- Install 4-oz woven geotextile fabric. Lay it across the full excavated area. Overlap seams by 6 inches. Fold and tuck the edges under where the edging will go. This is the most important step — it blocks weeds and prevents the base stone from mixing with the subgrade soil.
- Spread 2 inches of compacted #57 crushed stone. Wet the stone and compact with a plate compactor or hand tamper. This base layer carries the load and prevents the pea gravel from sinking after rain.
- Install edging on all sides. Drive stakes every 2–3 feet. Edging must be installed before the pea gravel goes in — you cannot stake edging after the surface is spread.
- Spread 2–3 inches of pea gravel. Rake level. Lightly wet the surface and walk on it to settle the stones. A 3-inch layer over a 2-inch base gives a total excavation depth of 5 inches — check this matches your prep.
Worked Example: 12×14 ft Dining Patio at 3 Inches
- Area: 12 × 14 = 168 sq ft
- Pea gravel volume (3 in): 168 × (3÷12) = 42 ft³ = 1.56 yd³
- Add 10% waste: 1.56 × 1.10 = 1.71 yd³ to order
- Weight: 1.71 × 1.35 = 2.31 tons
- Base stone (2 in): 168 × (2÷12) = 28 ft³ = 1.04 yd³ × 1.10 = 1.14 yd³
- Geotextile fabric: 168 sq ft + 10% overlap = 185 sq ft
- Edging: perimeter = (12+14) × 2 = 52 linear ft
| Item | Quantity | Unit Cost | Total |
|---|---|---|---|
| Pea gravel (3 in top layer) | 2.31 tons delivered | $48/ton | $111 |
| Crushed #57 base stone (2 in) | 1.14 yd³ delivered | $55/yd³ | $63 |
| 4-oz woven geotextile fabric | 185 sq ft | $0.45/sq ft | $83 |
| Steel landscape edging | 52 linear ft | $2.50/ft | $130 |
| Stakes | 26 stakes | $0.50 each | $13 |
| DIY Total | $400 | ||
| Labour (contractor install) | 168 sq ft | $5.00/sq ft | $840 |
| Fully Installed | $1,240 |
Patio Size Reference Table — Cubic Yards and Tons
All figures include 10% waste factor. Pea gravel layer only — add base stone separately.
| Patio Size | Area | 2-inch depth | 3-inch depth | Edging needed |
|---|---|---|---|---|
| Small (10×10 ft) | 100 sq ft | 0.62 yd³ / 0.83 tons | 0.93 yd³ / 1.25 tons | 40 linear ft |
| Standard (12×12 ft) | 144 sq ft | 0.89 yd³ / 1.20 tons | 1.33 yd³ / 1.80 tons | 48 linear ft |
| Dining (12×14 ft) | 168 sq ft | 1.04 yd³ / 1.40 tons | 1.71 yd³ / 2.31 tons | 52 linear ft |
| Large (15×20 ft) | 300 sq ft | 1.85 yd³ / 2.50 tons | 2.78 yd³ / 3.75 tons | 70 linear ft |
| Extra large (20×24 ft) | 480 sq ft | 2.96 yd³ / 4.00 tons | 4.44 yd³ / 5.99 tons | 88 linear ft |
| Circle 10 ft diameter | 78.5 sq ft | 0.48 yd³ / 0.65 tons | 0.73 yd³ / 0.98 tons | 32 linear ft |
| Circle 15 ft diameter | 177 sq ft | 1.09 yd³ / 1.47 tons | 1.64 yd³ / 2.21 tons | 48 linear ft |
| Circle 20 ft diameter | 314 sq ft | 1.94 yd³ / 2.62 tons | 2.91 yd³ / 3.93 tons | 63 linear ft |
How to Choose the Right Patio Size
The most common mistake in patio planning is undersizing. Furniture takes up far more space than people expect. Use these minimum dimensions as a guide:
| Use Case | Minimum Size | Recommended Size |
|---|---|---|
| Two chairs (reading / conversation area) | 8×8 ft | 10×10 ft |
| Four-seat dining table | 10×12 ft | 12×14 ft |
| Six-seat dining table | 12×14 ft | 14×16 ft |
| Eight-seat dining table | 14×16 ft | 16×20 ft |
| Fire pit with 4 chairs around | 14 ft diameter | 18 ft diameter |
| Fire pit with 6 chairs around | 18 ft diameter | 22 ft diameter |
| Outdoor sofa + coffee table | 10×14 ft | 12×16 ft |
Patio Furniture on Pea Gravel — What Works
Pea gravel works well under outdoor furniture with a few practical adjustments:
- Wide-base furniture works best. Adirondack chairs, Muskoka chairs, and sled-base outdoor sofas distribute weight across a larger area and sit stably on pea gravel.
- Narrow chair legs need glides. Standard metal chair legs sink into pea gravel. Fit 2–3 inch plastic furniture glides or place flat pavers under each leg.
- Set the table on pavers. A 24-inch or 36-inch concrete paver slab under the table legs keeps the table level and prevents rocking as chairs move.
- Fire pits need a non-combustible base. Place the fire pit on a concrete pad, stone slab, or dedicated fire-pit base — not directly on loose gravel. Pea gravel is non-combustible, but intense heat can cause moisture-trapped stones to fracture.
Pea Gravel Patio Drainage — Why It Outperforms Concrete and Pavers
Pea gravel has 30–40% void space between stones. Rain passes straight through the surface and into the base layer, then percolates through the subgrade. No surface runoff, no puddles, no standing water after heavy rain.
Concrete patios shed water as surface runoff, which concentrates near foundations and garden beds. Paver patios accumulate debris in joints and require periodic re-sanding. A pea gravel patio is the lowest-maintenance drainage solution for areas prone to pooling, clay soils, or poor drainage gradients.
One exception: if your subgrade is severely compacted clay, install a perforated drainage pipe along the low edge of the patio below the fabric and base layer to direct water to a French drain or daylight outlet.
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What People Get Wrong
Five pea gravel patio mistakes — most are easily avoided before any stone goes down.
Not installing edging before the gravel
Edging stakes must go in before the pea gravel is spread. After the surface is down, driving stakes through it is nearly impossible without scattering stones. Without edging, gravel migrates 4–8 inches into adjacent lawn within the first season.
Skipping the crushed-stone sub-base
Pea gravel laid directly on soil sinks into the ground after rain and foot traffic within one season. The 2-inch compacted #57 stone base is what keeps the surface level. Skip it and you rebuild the patio within 2 years.
Going too deep for a furniture patio
A 4-inch pea gravel layer looks generous but makes furniture legs sink, chairs rock, and walking uncomfortable. Keep the pea gravel layer at 2.5–3 inches for a usable seating patio. Use the extra depth budget on the base layer instead.
Undersizing the patio
A 10×10 ft patio sounds spacious until you put four chairs and a small table on it. Measure your actual furniture footprint on the lawn before excavating. Add 2 feet of clearance on all sides of the furniture arrangement as a minimum.
Using the wrong landscape fabric
Non-woven landscape fabric degrades in 2–3 years and lets weeds through. Use 4-oz or heavier woven polypropylene fabric. It costs slightly more but lasts 7–10 years. The difference in price on a 168 sq ft patio is approximately $15 — not worth skimping on.
Related Calculators
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General-purpose calculator for any area and depth — returns cubic yards, tons, and bags.
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Driveway-specific with 4-inch default depth and 15% compaction factor for vehicle traffic.
Related Guides
- Pea Gravel Landscaping Ideas — Patios, Paths, and Fire Pits
- How to Install Pea Gravel — Complete DIY Walkthrough
- 2026 Pea Gravel Cost Guide — Patio Pricing by Size
- Pea Gravel Maintenance Guide — Patio Annual Schedule
Frequently Asked Questions
How much pea gravel do I need for a patio?
A 12×14 ft patio at 3-inch depth needs 1.71 cubic yards (2.31 tons) including the 10% waste factor. A 10×10 ft patio at 2 inches needs 0.62 cubic yards (0.83 tons). Use the rectangular calculator above for your exact dimensions.
How thick should pea gravel be on a patio?
2.5–3 inches is the standard for patio use — stable enough for furniture, comfortable to walk on, and deep enough to cover the base layer. Going thicker than 3 inches makes furniture legs sink and walking feel unstable.
Do I need a sub-base for a pea gravel patio?
Yes. Install 2 inches of compacted #57 crushed stone over 4-oz woven geotextile fabric before adding the pea gravel. The base layer prevents the surface from sinking into the soil after rain and foot traffic.
Will patio furniture sink into pea gravel?
Narrow chair legs can sink slightly. Use 2–3 inch plastic furniture glides under chair legs or place flat pavers where chairs sit. Keep the pea gravel layer at 2.5 inches for maximum furniture stability — deeper gravel increases sinking.
How do I keep weeds out of a pea gravel patio?
Install 4-oz woven polypropylene geotextile fabric on the subgrade before adding the base stone. Woven fabric blocks 95%+ of weeds for 5–7 years. Avoid non-woven fabric — it degrades faster and lets weeds through within 2–3 years.
Can I put a fire pit on a pea gravel patio?
Yes — pea gravel is non-combustible. Place the fire pit on a concrete paver pad or fire-rated base, not directly on loose gravel. Allow a 24-inch minimum clearance zone around the fire pit. Never place a fire pit on wet pea gravel — trapped moisture can cause stones to fracture under heat.
How long does a pea gravel patio last?
The compacted stone base and geotextile fabric last 7–10 years. The pea gravel topcoat needs replenishing every 3–4 years as stones settle and migrate toward the edges. Annual raking keeps the surface level between top-ups.
How do I edge a pea gravel patio?
Steel landscape edging at $2.50–$4.00 per linear foot is the most durable option. Paver edging blocks, composite plastic edging, and pressure-treated 2×6 lumber all work well. Stake every 2–3 feet and install the edging before spreading the pea gravel.
How much does a pea gravel patio cost in 2026?
A 12×14 ft patio costs approximately $400 in materials DIY — pea gravel, base stone, fabric, and edging. Fully installed by a contractor: $1,200–$2,000. Compare to concrete at $8–$15 per sq ft installed ($1,344–$2,520 for the same area).
Is a pea gravel patio comfortable for bare feet?
Standard 3/8-inch pea gravel is tolerable barefoot but not comfortable for extended periods. Smaller 1/4-inch screened pea gravel is smoother. For a patio used barefoot regularly, use large flat stepping stones in main traffic paths and pea gravel in the gaps.
Can I put a pergola or gazebo over a pea gravel patio?
Yes. Dig concrete footings for the posts before spreading the gravel. Footings should reach below the frost line in your area. Spread pea gravel around the footings after the concrete cures — minimum 48 hours, ideally 7 days before loading the posts.
How does drainage work on a pea gravel patio?
Pea gravel has 30–40% void space between stones — rain passes straight through rather than pooling on the surface. No puddles, no runoff, even in heavy rain. This makes pea gravel better than concrete or pavers for areas with drainage issues or clay soils.
Sources & Methodology
Formula: Volume (ft³) = Length × Width × Depth (ft). Cubic yards = ft³ ÷ 27. Add 10% waste. Patio default: 3-inch top layer over 2-inch #57 base. Circle: π × (diameter÷2)² × depth ÷ 27.
Sub-base standard: 2-inch compacted #57 crushed stone per ICPI residential patio recommendations, adapted for gravel surfaces.
Verified against:
- ICPI — Interlocking Concrete Pavement Institute — patio sub-base standards
- ASLA — American Society of Landscape Architects — residential patio design references
- USGS — Aggregate Statistics — density reference
Last reviewed: May 12, 2026 · Full methodology