A pea gravel calculator multiplies your area by the depth to find volume, then converts to tons using pea gravel’s density of about 1.35 tons per cubic yard — lighter than crushed stone because the small, round stones pack loosely. Enter your measurements above for an instant estimate with waste included.
How much pea gravel do I need?
To find how much pea gravel you need, multiply the area (length × width in feet) by the depth in feet, divide by 27 for cubic yards, then multiply by 1.35 for tons. A 120-square-foot path at 2 inches deep comes to about 0.8 cubic yards, or just over 1 ton, once waste is included.
Pea gravel’s lighter density is the reason it needs its own calculation. Plug a pea-gravel project into a generic tool set to crushed-stone weight and you will over-order tonnage by roughly 5%. This page fixes the density for you; for a mixed project, the main gravel calculator lets you pick any stone type.
How deep should pea gravel be?
Lay pea gravel about 2 inches deep for walkways and decorative beds, and up to 3 inches for a patio or seating area. Unlike angular stone, pea gravel does not lock together, so a deeper layer just feels loose and shifts underfoot — more depth is not more stability. Over a weed barrier, 2 inches gives full coverage without the “walking on a beach” feeling.
| Depth | 1 ton covers | 1 cubic yard covers |
|---|---|---|
| 1 inch (top-up) | ~215 sq ft | ~320 sq ft |
| 2 inches | ~107 sq ft | ~160 sq ft |
| 3 inches | ~71 sq ft | ~108 sq ft |
What is pea gravel best for?
Pea gravel is best for low-traffic, decorative and drainage projects — garden paths, patios and courtyards, playground surfacing, dog runs, fire-pit surrounds, French drains and filling between pavers. Its smooth, rounded stones are comfortable underfoot and come in natural browns, tans, grays and whites, which is why landscapers reach for it around seating and planting. The one place it struggles is anywhere with vehicle traffic, where it scatters.
Pea gravel vs crushed stone — which should you use?
Choose pea gravel for looks and comfort, and crushed stone for structure. Pea gravel’s rounded shape is soft on bare feet and visually calm, but those same round faces refuse to lock together, so it moves. Crushed stone is angular and sharp-edged, which makes it compact into a firm, load-bearing surface — ideal for bases and driveways but harsher underfoot. Many projects use both: a compacted crushed-stone base for stability with a thin pea-gravel top for the finish.
| Pea gravel | Crushed stone (#57) | |
|---|---|---|
| Shape | Rounded, smooth | Angular, sharp |
| Compacts? | No — stays loose | Yes — locks firm |
| Best for | Paths, patios, play | Bases, driveways, drainage |
| Underfoot | Soft, comfortable | Firm, harder |
| Density | ~1.35 t/yd³ | ~1.4 t/yd³ |
Do you need edging and fabric under pea gravel?
Yes — pea gravel needs both a border and a base fabric to behave. Because the stones are round and loose, they spread wherever there is no edge, so timber, steel or paver edging keeps them contained. A woven landscape fabric underneath stops the gravel working down into the soil and blocks weeds from pushing through. Skip either and you will be raking stray stones out of the lawn and pulling weeds within a season. For how much stone the job needs, put your finished area into the calculator above.
How to lay pea gravel, step by step
Laying pea gravel well is mostly about the groundwork, not the stone. A path or patio done in an afternoon holds up for years if you follow these steps:
- Mark and excavate. Outline the area and dig down about 2–3 inches — enough for the gravel plus a firm edge — removing grass and roots.
- Level and lightly compact the soil so the finished surface sits flat and does not dish over time.
- Install edging around the perimeter — steel, timber or paver — proud enough to hold the gravel in.
- Roll out landscape fabric, overlapping seams by a few inches, so weeds and soil stay separated from the stone.
- Add a base if it will see traffic. For a patio or seating area, a 2-inch compacted crushed-stone base under the pea gravel stops it shifting; a decorative bed can skip this.
- Spread the pea gravel to about 2 inches and rake it level. Order using the calculator above so you have just enough, plus the 10% waste for topping up.
Keep a small bag of extra stone aside — pea gravel migrates a little with foot traffic, and a quick top-up each spring keeps paths looking full and even.