Pea Gravel Patio Calculator

What the Pea Gravel patio calculator computes

Pea Gravel patios are the easiest aggregate install for a homeowner to tackle in a weekend, but only if the volume math is right. The calculator takes patio area in square feet and finished depth in inches, then converts to cubic yards and tons using Pea Gravel's 2,800 lb per cubic yard density. A typical 200 square foot patio at the recommended 2 inch finished depth needs 33 cubic feet or 1.25 cubic yards, which is about 1.75 tons.

The trap is that Pea Gravel sits on top of a base course. The pea-gravel-only number gives you the visible material, but the install also needs a 2 inch compacted base of Paver Base or Crusher Run underneath. So the full project tonnage is roughly double what the surface calculation alone suggests. Order both materials at the same time and the yard often combines them into one truck for a single delivery fee.

Pea Gravel size and depth conventions

"Pea gravel" describes any rounded gravel sized between 1/4 inch and 3/8 inch. The exact grade matters more than the name. 3/8" Natural Pea Gravel reads as the classic patio grade: small enough to walk on barefoot, large enough to stay in place under light foot traffic. Smaller grades (1/4 inch and under) feel like beach sand underfoot and migrate too easily for a patio surface. Larger grades (1/2 inch and up) read as decorative river rock and are uncomfortable on bare feet.

The finished depth target is 2 inches over a compacted base. Going deeper than 3 inches makes the surface feel like loose sand and exhausts anyone trying to walk across it. Going shallower than 1.5 inches and the base course shows through where chairs dig in. The 2 inch target settles to about 1.5 inches of dense walking surface after the first year of use, which is why most installers plan a top-up of one to two cubic yards every 4 to 6 years for a heavily-used patio.

Base course, edging, and the full system

A Pea Gravel patio is really three layers working together. The base is 2 inches of Paver Base or Crusher Run, screeded level and compacted with a plate compactor (rentable at any hardware store for $60 to $80 per day). On top of the base goes a layer of 4 to 6 ounce woven landscape fabric pinned with 6 inch galvanized staples every 18 inches along edges and seams. The fabric keeps the soil from migrating up into the gravel layer and the gravel from sinking into the soil. Skipping fabric saves about $30 per 100 square feet and costs you a yearly weekend of pulling weeds.

Edging holds the perimeter. Steel landscape edging is the most durable choice ($1 to $3 per linear foot installed). Treated 2x6 lumber buried 4 inches on edge works for 10 to 15 years. Poured concrete curbs cost more but never need replacing. Without edging, the pea gravel migrates into the surrounding lawn or beds at a rate of about one cubic foot per linear foot of unprotected edge per year.

Pricing and ordering for a typical patio

3/8" Natural Pea Gravel runs $48 to $72 per ton delivered. Paver Base for the base layer is $38 to $58 per ton. For a 200 square foot patio, expect 1.75 tons of pea gravel plus 2 tons of paver base, totaling roughly $200 to $320 in materials delivered. Fabric and edging add another $80 to $150 depending on the perimeter length.

Same-day delivery windows are usually open before 11 AM with 1 to 2 day lead times as standard. A small-volume drop of under 3 tons usually arrives on a tandem-axle truck rather than a full tri-axle, which fits most residential driveways without scraping a low-hanging branch or scuffing a curb. Tell the dispatcher about access constraints when you order; they have shorter trucks for tight lots if you ask in advance.

Order 10 to 15 percent overage on the pea gravel itself. The first few weeks of foot traffic settle the surface, and a small top-up at the one-month mark levels the spots that compacted faster than the rest. Store the extra under a tarp; pea gravel keeps indefinitely as long as it stays dry-ish.

Mistakes that turn a one-day install into a re-do

The most common mistake is laying Pea Gravel directly on bare soil. The patio looks finished for about three months. Then the gravel disappears as it sinks into the soil and the bed turns into a weed garden. Always install the base course and fabric, even on dry clay soils that look stable. The 2 inches of Paver Base costs about $50 for a 200 square foot patio and is the single biggest predictor of whether the install lasts 10 years or fails by the next spring.

The second mistake is no edging. Pea Gravel has a 100 percent migration rate at any unprotected edge. Within one year, the patio looks like an undefined gravel zone bleeding into the lawn. Edging is the difference between a finished patio and a gravel pile.

The third mistake is over-depth. Three inches of Pea Gravel feels like wet sand underfoot. The temptation when ordering is to round up generously, but more is not better here. Stick to the 2 inch finished target on top of the 2 inch compacted base. Save the leftover gravel for the inevitable top-up year three or four.

Pea Gravel maintenance through the seasons

Pea Gravel patios need predictable seasonal attention. In spring, rake the surface to redistribute gravel that migrated during winter, top up any thin spots with leftover gravel from the original install, and inspect the edging for displacement. In summer, the surface needs no maintenance beyond occasional debris removal; a leaf blower handles tree-drop on a heavily-treed patio in 5 minutes.

In fall, rake fallen leaves promptly; leaves left on Pea Gravel decompose into the gravel surface and create a thin organic mat that supports weed germination the following spring. A leaf blower works for light coverage; for heavy leaf-fall under deciduous trees, a tarp laid on the patio before leaf fall and lifted weekly is the lowest-effort solution.

In winter, freeze-thaw cycles loosen the perimeter edging. Plan a quick edge inspection in early spring to reset any displaced edging before the patio sees use. For patios in regions with snow, avoid metal snow shovels that scrape Pea Gravel up with the snow; a plastic snow shovel or a leaf blower on a powerful setting clears snow without disturbing the surface.

Annual cost for Pea Gravel patio maintenance averages $20 to $50 in materials, which covers a half-yard top-up of fresh gravel plus a few replacement edging staples or stakes. Schedule the maintenance for early spring once the ground is no longer frozen. Patios that get this annual half-hour of attention look essentially the same in year 10 as they did the day of install.