Pea gravel calculator

This calculator works in area mode: you give it a length, a width and a depth, and it treats the gravel as a flat layer spread across that footprint. That is the right shape of math for a path, a patio surround, a border bed or a play area, where the material sits in one even course rather than being stacked in layers or packed around a pipe. If your project instead involves backfilling a trench, the french drain gravel calculator accounts for the pipe taking up part of the volume, and if you are building a driveway with a compacted base under a surface layer, the gravel driveway calculator handles each course separately. Pea gravel almost never needs that kind of layering, since it is usually the only material in the bed, laid once at a single consistent depth over the whole footprint rather than built up from separate courses. Knowing which mode fits your project before you start measuring saves a second trip back to this page with different numbers.

Pea gravel is sold both in bags and in bulk, and which one makes sense depends heavily on the size of the area you just measured. A small border bed or a single stepping stone path often comes out to well under a cubic yard, and at that scale the delivery minimum many bulk suppliers charge can cost more than the gravel itself, so bags from a hardware store are often the cheaper and more convenient route. Run the same dimensions through the gravel bag calculator to see the bag count, and compare it against a bulk quote with the gravel cost calculator before you commit either way. Larger patios and play areas tend to tip toward bulk once the bag count climbs into the dozens, since bulk pricing per unit volume is almost always lower.

Because pea gravel is rounded rather than angular, it does not compact or lock together the way crushed stone does, so there is no real compaction step to plan for here the way there is under a driveway or a paver base. What you do need to plan for is containment. A flat bed of loose, round stones will migrate outward under foot traffic, rain runoff and mowing unless it is held by an edge, whether that is plastic landscape edging, a paver border, or a run of landscape timbers. Decide on the edging before you order, because it defines the exact footprint you should be measuring and entering above, and it is easier to set in place before the gravel arrives than to retrofit underneath an existing bed.

If you are deciding between pea gravel and a different material for the same footprint, the shapes of the stone matter more than the price per ton. Pea gravel is comfortable underfoot and drains well, which is why it shows up so often in play areas and informal paths, but its looseness is a real tradeoff against a material like crushed stone, which compacts into a firmer, more walkable surface. The guide comparing pea gravel and crushed stone goes through that tradeoff in more detail, and the crushed stone calculator runs the same area and depth math if you decide angular stone suits the project better. For a more general looking decorative stone rather than pea gravel specifically, a dedicated decorative gravel calculator elsewhere on this site covers similar ground with different material assumptions.

Once you have a volume or tonnage figure from the calculator above, treat it as the amount to order, not necessarily the amount you will use on day one. Pea gravel settles slightly as it is walked on and rained on, so a bed that looks full on delivery day can look thinner a few weeks later, and keeping a partial bag or two in reserve saves a second supplier trip for what is usually a small top up. If several beds or paths across the same yard all use pea gravel, it is worth running each one through the gravel coverage calculator against a single bulk order rather than estimating each separately, since consolidating into one delivery is almost always cheaper than several small ones. It also keeps the stone consistent across the whole yard, which matters more with a decorative material like pea gravel than it does with a base stone that ends up buried and out of sight.