How Much Pea Gravel Do I Need for a Patio?

Measure the patio, pick a depth, and convert to cubic yards, tons or bags. This guide walks through the maths with real examples so you can order the right amount the first time.

Gravel & stone · Published November 9, 2026 · 7 min read

The short answer: for a pea gravel patio, plan on 3 inches (7.5 cm) of gravel, which is 1 cubic yard for every 108 square feet. A typical 12 × 16 ft patio needs a little under 2 cubic yards, or about 2.6 tons. The rest of this guide shows how to get your own number, how much extra to add, and when you also need a base layer underneath.

If you just want the figure, enter your measurements in the pea gravel calculator. It converts between cubic yards, tons, bags, and metric units for you.

The formula

Pea gravel is ordered by volume (cubic yards or cubic metres) or by weight (tons or tonnes). You always start with volume:

Area = length × width, in square feet.
Volume (cu ft) = area × depth in inches ÷ 12.
Cubic yards = cubic feet ÷ 27.
Tons = cubic yards × density. About 1.4 tons per cubic yard is a common planning figure for pea gravel (roughly 1.66 tonnes per m³).
Add a small allowance, usually 5%, for settling, uneven ground and spillage.

In metric the steps are the same: area in m² × depth in metres gives m³, and m³ × 1.66 gives tonnes.

Density varies with the stone type, size and moisture, so if your supplier gives a figure per yard or per tonne, use theirs. Over a whole patio, a 0.1 ton/yd³ difference changes the order by about 7%.

How deep should pea gravel be for a patio?

Depth matters more than anything else in the calculation. Doubling the depth doubles the gravel.

2 inches (5 cm): the practical minimum. Fine for a lightly used sitting area over a firm base, but fabric or soil can show through as the stones shift.
3 inches (7.5 cm): the usual choice for a patio with chairs, a table or a fire pit. Thick enough to cover the base and hide wear, thin enough to stay reasonably firm underfoot.
4 inches (10 cm) or more: generally too loose for a patio. Pea gravel is rounded, so it does not lock together, and a deep layer feels like walking on a beach. Chair legs sink in. Spend the extra depth on a crushed-stone base instead.

If you want a firmer surface without changing the material, a plastic gravel stabilizer grid (honeycomb panels, often 1½ to 2 inches tall) holds the stones in cells. You fill the grid and add a thin cover layer. In that case, calculate the grid depth plus about ½ inch on top.

Coverage table

These figures use 1.4 tons per cubic yard and do not include the extra allowance.

Depth	Area covered by 1 cubic yard	Area covered by 1 ton
1 in (2.5 cm)	324 sq ft (30 m²)	231 sq ft (21.5 m²)
2 in (5 cm)	162 sq ft (15 m²)	116 sq ft (10.8 m²)
3 in (7.5 cm)	108 sq ft (10 m²)	77 sq ft (7.2 m²)
4 in (10 cm)	81 sq ft (7.5 m²)	58 sq ft (5.4 m²)

To use it, divide your patio area by the number in the row for your depth. For example, a 200 sq ft patio at 3 inches needs 200 ÷ 108 = 1.85 cubic yards before the extra allowance.

Worked example 1: a 12 × 16 ft rectangular patio

You are building a 12 × 16 ft (about 3.66 × 4.88 m) sitting area, 3 inches deep, and adding 5% extra.

Area: 12 × 16 = 192 sq ft (17.8 m²).
Volume: 192 × 3 ÷ 12 = 48 cu ft (1.36 m³).
With 5% extra: 48 × 1.05 = 50.4 cu ft (1.43 m³).
Cubic yards: 50.4 ÷ 27 = 1.87 yd³.
Weight: 1.87 × 1.4 = 2.61 tons (about 5,230 lb, or 2.37 tonnes).

What to order: most landscape yards sell in whole or half yards, so order 2 cubic yards (or 2.5 to 2.75 tons if they sell by weight). The small surplus is useful for topping up after the first season of settling.

If you buy bags: with 0.5 cu ft bags you need 50.4 ÷ 0.5 = 101 bags. If the bags are labelled by weight, divide the total weight by the bag weight: 5,230 ÷ 50 = 105 bags of 50 lb. Either way, that is more than two and a half tons to lift into a car and carry, which is why bulk delivery usually wins at this size.

Worked example 2: a round patio around a fire pit

A circular gravel patio is 12 ft (3.66 m) across, with a 4 ft (1.22 m) diameter fire pit in the middle that will not get gravel. Depth is 3 inches, with 5% extra.

Patio area: π × 6² = 113.1 sq ft. (For a circle, area = 3.1416 × radius².)
Fire pit area: π × 2² = 12.6 sq ft.
Gravel area: 113.1 − 12.6 = 100.5 sq ft (9.3 m²).
Volume with extra: 100.5 × 3 ÷ 12 × 1.05 = 26.4 cu ft (0.75 m³).
Cubic yards: 26.4 ÷ 27 = 0.98 yd³, about 1.37 tons (1.24 tonnes).

What to order: 1 cubic yard. In bags, that is about 53 bags of 0.5 cu ft, or 55 bags of 50 lb.

For L-shaped or irregular patios, split the outline into rectangles, triangles (½ × base × height) and circles, work out each area, and add them up before multiplying by depth.

Do you need a base under the pea gravel?

Pea gravel on its own does not compact. On soft ground it slowly works down into the soil and the patio becomes uneven and muddy. You have three common options:

Fabric only. On firm, free-draining soil, remove turf and topsoil, level and tamp the ground, lay permeable landscape fabric, then add the pea gravel. Cheapest and quickest.
Crushed-stone base. On clay, soft or wet soil, put down 3 to 4 inches (7.5 to 10 cm) of compactable crushed stone (often sold as crusher run, road base or ¾-inch minus), compact it with a plate compactor, then add fabric and the pea gravel. This gives the most stable result.
Stabilizer grid. Lay the grid over a compacted base, fill the cells with pea gravel, and add a thin cover layer.

Base example: for the 12 × 16 ft patio, a 4-inch base is 192 × 4 ÷ 12 = 64 cu ft. Crushed stone loses volume as it compacts, so add around 15%: 64 × 1.15 = 73.6 cu ft = 2.73 yd³, or about 3.8 tons at 1.4 tons/yd³. Check that against your supplier's compacted figure. Use the gravel calculator for base layers, because it has presets for denser materials such as crusher run.

Remember to dig deep enough for both layers. A 3-inch gravel layer on a 4-inch base needs about 7 inches (18 cm) of excavation if you want the finished surface level with the surrounding lawn.

Edging and other materials

Pea gravel rolls, so a patio without edging slowly spreads into the lawn and beds. Plan for:

Edging along the whole perimeter. For the 12 × 16 ft patio that is 2 × (12 + 16) = 56 linear ft (17 m). Steel, aluminium, timber, stone or paver borders all work. The edging should stand at least as high as the gravel layer.
Landscape fabric to cover the area plus overlaps. Buy about 10% more than the area, so roughly 210 sq ft for the example.
Stepping stones or a paver landing at doors and gates, where gravel tends to get carried indoors. The paver calculator works out pavers, base and sand for a small landing.

Bulk versus bags: comparing cost

Prices vary a lot by region, stone source and season, so get local quotes rather than relying on national averages. To compare like for like:

Bulk: multiply the tons (or yards) by the delivered price, then add any delivery charge or small-load fee. Many yards have a minimum order.
Bags: multiply the bag count by the bag price. There is no delivery fee if you collect, but count the trips and the lifting.

As an illustration only, using the example prices filled in on our calculator ($50 per ton bulk, $6 per 50 lb bag), the 12 × 16 ft patio would cost about 2.6 × $50 = $130 in bulk plus delivery, against 105 × $6 = $630 in bags. Your prices will be different, but the pattern is common: above about a cubic yard, bulk is usually much cheaper, even with a delivery fee. Enter your own prices in the pea gravel calculator to see the comparison for your project.

Common mistakes to avoid

Mixing up feet and inches. Depth is almost always given in inches, so divide by 12 before multiplying by area in square feet. A 3-inch layer is 0.25 ft, not 3 ft.
Forgetting to convert to cubic yards. Suppliers quote per cubic yard, and 1 yd³ is 27 cu ft, not 9.
Ordering exactly the calculated amount. Ground is never perfectly flat. Keep the 5% allowance and round up to the supplier's next increment.
Skipping edging. It is the main reason gravel patios look untidy after a year.
Going too deep. If the surface feels soft, the fix is a firm base, not more pea gravel.

Frequently asked questions

How many bags of pea gravel do I need for a 10 x 10 patio?

A 10 × 10 ft patio is 100 sq ft. At 3 inches deep that is 25 cu ft of gravel, or about 26 cu ft with 5% extra. With 0.5 cu ft bags that is 53 bags; with 50 lb bags (at about 1.4 tons per cubic yard) it is about 55 bags.

How deep should pea gravel be on a patio?

Plan on 2 to 3 inches (5 to 7.5 cm) of pea gravel. 3 inches is the usual choice where chairs and tables will sit. Going much deeper makes the surface loose and tiring to walk on.

How much area does one ton of pea gravel cover?

At a typical 1.4 tons per cubic yard, one ton covers about 116 sq ft at 2 inches deep, 77 sq ft at 3 inches and 58 sq ft at 4 inches. Your supplier's density may differ slightly.

Do I need a base under a pea gravel patio?

Not always, but it helps. On firm, well-drained soil, landscape fabric and solid edging are often enough. On soft or clay soil, a 3 to 4 inch layer of compacted crushed stone under the pea gravel gives a firmer, more even patio.

Should I buy pea gravel in bags or bulk?

Above roughly 1 cubic yard, bulk is usually cheaper and far less lifting, even after a delivery fee. Bags make sense for small areas, top-ups, or where a truck cannot get close.