Pea Gravel Calculator
Pea gravel is rounded, loose and easy to underestimate, so this calculator is deliberately explicit about depth. Enter the path, bed or patio area, choose a depth from the use-case guidance — usually a couple of inches for a walkway, a little more where the stone has to stay put — and the page returns area, cubic feet, cubic yards, an estimated weight in tons and bag counts for common bag sizes. Waste is applied before the recommended order quantity, because loose stone migrates at edges and corners no matter how carefully it is spread. The material-specific density keeps the weight figure honest for a smooth, uniform stone that is lighter per yard than crushed product. A price field is included if you want a cost estimate for the load. It suits anyone planning a decorative path, a planting-bed cover, a gravel patio surface or a low-maintenance yard area who needs to know how much to buy in the units the supplier actually sells.
Calculator input
Project areas
Use one or more areas. The engine adds them before calculating volume.
What this calculator calculates
- Area in square feet for the path, bed or surface being covered
- Volume in cubic feet and cubic yards at the chosen depth
- Estimated tons using the pea gravel density for this material
- Recommended order volume with waste included
- Bag counts for common bag sizes of rounded stone
- Material cost from the price you enter per yard, ton or bag
Projects this calculator covers
- Walkways and garden pathsThe everyday use: a shallow, contained layer over a prepared, levelled surface.
- Planting beds and ground coverA decorative layer around plants and features where drainage matters more than foot traffic.
- Gravel patio surfaceLoose stone as a finished surface, planned with edging that keeps it from walking outwards.
- Play areas and low-maintenance yardsLarger covered areas where depth consistency determines how much the yard actually costs.
How the calculation works
The page uses the shared bulk engine but applies pea-gravel-specific density and use-case guidance.
Formula: Area × depth ÷ 12, converted to cubic yards and tons, with waste applied to the purchase volume.
Worked example
10 × 16 ft garden path at 2 in
Use edging when the material needs to stay contained.
Reading the results
- Coverage varies with depth. One yard covers less area as depth increases, and rounded stone is usually laid thinner than crushed product. Compare the coverage implied by your depth against supplier figures before ordering.
- Volume versus weight. Pea gravel is often quoted per cubic yard, sometimes per ton. The tons figure uses this material density — smooth stone packs differently from angular aggregate, so confirm with the supplier.
- Loose material needs an edge. The quantity calculated covers the surface, not the restraint. Edging is a separate purchase, and the waste allowance is there because migration at edges is normal.
- Ordering bags or bulk. Small paths are fine with bags; a patio or full yard almost always justifies a bulk load. The purchase advice follows the volume your calculation produces.
Assumptions
Central engine assumptions can be inspected in the methodology view. User-entered prices never get replaced with invented market prices.
Practical planning guidance
- Pick depth from how the surface is used: 1–2 in for a light path, 2–3 in where the stone has to resist being kicked aside.
- Fit edging before spreading, because loose rounded stone finds the lowest edge on the first heavy rain.
- Prepare and compact the ground first — pea gravel does not lock together, so the layer underneath does the stabilising.
- Ask for coverage per yard from the supplier and compare it with what your chosen depth implies.
- Order a little extra rather than exactly the calculated figure; spillage during spreading is normal with small rounded stone.
Common mistakes
- Assuming pea gravel compacts like a crushed paver base — it does not, and the depth you lay is the depth that stays.
- Ignoring migration on slopes or at open edges where nothing holds the stone in place.
- Reusing a crushed-gravel density and misreading how heavy the load will be.
- Calculating only the visible surface and forgetting the prepared base underneath it.
- Laying too thin a layer because the coverage figure sounded generous, then seeing the ground through the stone.
Important limitations
Frequently asked questions
How much pea gravel do I need?
Multiply the area by the depth in feet to get cubic feet, divide by 27 for cubic yards, then add waste. The calculator performs those steps for every shape you enter and shows the order quantity.
How deep should pea gravel be?
Planning ranges on the page run from about 1 in for light cover to 3 in for surfaces that take foot traffic. Drainage, the ground below and the look you want can all move that.
How much does a cubic yard of pea gravel cover?
It depends on depth: a yard covers far more ground at 1 in than at 3 in. Enter your depth and the result shows the area the quantity covers.
Is pea gravel sold by the yard or by the ton?
Either. This page gives both figures using the pea gravel density, so you can compare a volume quote and a weight quote directly.
Does pea gravel need a base underneath?
Usually a prepared, compacted layer keeps it stable. The surface depth you calculate here is separate from that base, which the paver base page can plan.
Can I estimate the cost of the stone?
Yes, enter the supplier price per yard, ton or bag. The estimate covers material only — delivery and edging are separate lines you can add in Project Mode.
Planning guides
Related calculators
Your estimate will appear here
Enter your dimensions, then calculate. Results stay tied to the tested engine.