Pea Gravel Calculator — Delaware

This calculator turns a bed measurement into an order you can place. Pea gravel is small, smooth, rounded stone about 3/8 inch across, spread over an area at a set depth. The tool takes that area and depth and returns the volume and weight you need. It reports both cubic yards and tons.

The math starts with area times depth. You enter the length and width of the area, and the calculator finds the square footage. Depth is entered in inches, so the tool converts inches to feet first. A 2-inch layer becomes 0.167 feet. Area times that depth gives a volume in cubic feet.

Next the tool converts to the units suppliers use. It divides the cubic feet by 27 to get cubic yards. A cubic yard is a block 3 feet on every side. The calculator then multiplies the cubic yards by about 1.35 tons per cubic yard to reach a weight in tons.

The last step adds an overage allowance. The default is 10 percent. This covers uneven ground, stone that settles into the soil, and gravel lost past the edges. You can raise or lower the allowance to match your site.

The result gives you cubic yards and tons for the area. Pea gravel is often sold by weight, so the tonnage figure is what a landscape yard needs. The cubic yard figure helps when a yard sells by volume instead.

Because pea gravel is rounded, it does not compact the way angular base stone does. You do not order extra for packing. You order for the loose depth you want to see. Enter your area and target depth to read your totals.

Depth is the biggest lever on how much you order, and the right depth depends entirely on what the stone has to do. Getting it right before you calculate keeps the order honest.

For decorative ground cover, a shallow layer is enough. Plan about 2 to 3 inches over landscape fabric. That depth hides the fabric, blocks light, and reads as a finished stone bed. A layer thinner than 2 inches lets the fabric show through and shifts underfoot.

Paths and patios ask for a bit more thought. Pea gravel is round, so it moves under traffic. A 2-to-3-inch layer works over a firm, prepared base, and a stabilizing grid or fabric keeps the surface from rutting. Do not pour a deep loose layer and expect it to stay put.

Play areas and dog runs use a cushioning depth. A deeper loose layer softens falls and drains well underfoot. Follow the surface design for the space, and keep the layer even so it stays comfortable across the whole area.

Drainage work follows the trench, not a ground-cover rule. A French drain or a downspout channel carries water, so the stone fills a real cut several inches deep. The depth comes from the drainage design, not from a decorative layer.

Write down one depth per area before you calculate. If a project mixes a shallow ground-cover bed with a deep drainage trench, size them separately and add the results. A single average depth across mixed jobs throws off both. Set the depth for each use, then let the tool size the tons and cubic yards.

Pea gravel is sold two ways, by the ton or by the cubic yard. Knowing both units keeps your order clear and lets you check any quote.

A cubic yard is a measure of volume. It is a block 3 feet on every side, which equals 27 cubic feet. A ton is a measure of weight. To move between the two, you use the stone's density. For pea gravel, plan on about 1.35 tons per cubic yard.

This calculator handles the conversion for you. It finds the cubic yards your area needs, then multiplies by the density to reach tons. It shows both numbers so you can order in whichever unit your yard uses.

Density is not exact for every load. Pea gravel varies with the rock type and the moisture in the pile. Rounded stone also leaves gaps between the pieces, so a loose pile weighs less per cubic yard than solid rock would. The 1.35 figure is a solid planning number, not a lab value. Ask your supplier for the density of the exact product you buy.

Why report tons at all? Bulk stone is weighed on a truck scale at the yard, and the delivery ticket lists tons. A tonnage estimate matches that ticket, so you can compare what arrived against what you planned.

If your yard sells by the cubic yard, use that figure straight from the tool. If it sells by the ton, use the tonnage. To move a tonnage back to volume yourself, divide the tons by 1.35. Either way, you place one clear order and avoid a second trip for a shortfall.

The area math gives you a clean number, but a real site is not clean. Stone settles, ground dips, and rounded pieces roll past the edge. A small overage allowance covers the gap between the tidy estimate and the messy site.

This calculator adds an overage by default, set at 10 percent. The allowance covers a few things at once. Some stone settles down into the soil or the fabric below. Some spreads past the marked edge as you rake it out. Some fills low spots you did not measure. The allowance keeps you from running short at the end.

Raise the allowance on a rough or sloped site. Uneven ground swallows more stone than a flat area. A slope lets loose gravel creep downhill, so the low end needs extra. On a broken shape with many curves, add a little more to be safe.

Pea gravel is rounded, so it migrates more than angular stone. It rolls away from traffic and drifts toward edges over time. That habit is a reason to keep the allowance on, not to drop it. The extra tops off spots that thin out as the gravel shifts.

Measure the area honestly before you trust the total. Break an odd shape into simple rectangles, size each part, then add them. Curves and cutouts change the true area. An area measured too small leaves you short no matter the allowance.

When the total lands between two order sizes, round up. A small surplus spreads as a slightly deeper layer or tops off a thin spot. It also feeds future touch-ups as gravel migrates. A modest overage is cheaper than a second delivery and a half-finished area.

Once you know your tonnage, plan the delivery. Bulk pea gravel arrives by dump truck. One standard dump truck holds about 10 to 14 tons. Your total tells you how many truckloads the job needs.

A small decorative bed may need only a few tons. That fits in one load with room to spare. A large patio, path, or play area can pass what a single truck carries. If your total is above the truck limit, expect more than one delivery, or a larger vehicle. Ask your supplier what their trucks carry.

Think about where the truck will dump. Bulk stone drops in a large pile. Pick a spot close to the work but off the planting area. A pile on the bed itself blocks your fabric and grid work. A pile far from the work means a long wheelbarrow haul over your lawn.

Protect the drop area. Dumping pea gravel on grass leaves ruts and buries the turf. A tarp or a sheet of plywood keeps the pile off the surface and speeds cleanup. Small round stone works into soil and grass fast, so a clean drop is worth the effort.

Order by one product per area. Pea gravel comes in different colors and washed grades. Mixed loads in a single pile are hard to spread evenly. If a project uses two looks, order them separately and keep the piles apart.

Check the weighed ticket when the truck arrives. It lists the tons delivered. Compare it against your estimate. A close match confirms the order is right. Have your wheelbarrow, rake, and helpers ready, because a bulk pile sits in the open until you move it. Rain does not spoil the stone, but a loose pile scatters and invites weeds.

Pea gravel lasts only as long as the area under it stays clean and the edges hold the stone in. Because it is round, containment matters more here than with angular stone. These steps shape how the finished area holds up, though none of them change the tonnage the calculator gives you.

Start by clearing the area. Remove weeds, grass, and roots down to bare soil. Grade the surface smooth and set any slope you need for drainage. Gravel spread over a rough or weedy base never settles into a clean layer.

Lay landscape fabric across the cleared soil before the stone goes down. The fabric blocks weeds from below and keeps the gravel from sinking into the dirt. Without it, small round stone works into the soil and weeds push up through the gaps. Overlap the seams and pin the fabric flat.

Set an edge around the area to hold the stone. Pea gravel is round, so it rolls and creeps without a firm border. Metal, plastic, stone, or timber edging keeps the gravel off the lawn and walks. A firm edge also draws a clean line and lets you keep the layer even.

For paths and patios, add a stabilizing grid. A honeycomb grid or a bonded panel locks the round stone in place so it does not rut or migrate under foot and wheel traffic. The grid fills with gravel and hides below the surface. It is the difference between a path that stays put and one that scatters.

Mind the depth against the edge height. The gravel should sit a little below the top of the edging so loose stone does not spill over. Do not compact pea gravel. Rake it level to the depth you planned, and let the grid and edge do the holding.

Most pea gravel shortfalls trace to a few repeat errors. Knowing them ahead of time saves a second trip to the yard and a half-covered area.

The first mistake is entering depth in the wrong units. The tool wants inches. If you type feet where inches belong, the estimate swings far off. Read your depth back before you trust the total. A 2 should mean 2 inches, not 2 feet.

The second mistake is one depth for every area. A shallow ground-cover bed and a deep drainage trench need very different depths. Averaging them shorts the trench and overfills the bed. Size each area on its own, then add the results.

The third mistake is treating pea gravel like it compacts. Rounded stone does not lock or shrink under a compactor. You order for the loose depth you want to see, not a packed one. Planning a compaction margin here overshoots the order.

The fourth mistake is measuring a curved area as a clean rectangle. Pea gravel beds and paths often wind and taper. Break an odd shape into simple parts, size each part, and add them. An area measured too large or too small carries straight into the tonnage.

The fifth mistake is dropping the overage allowance. Round stone settles, spreads, and migrates past the edge more than angular stone does. Without a margin, the estimate covers a perfect area you will not have. Keep the allowance on, and raise it on rough or sloped ground.

The last mistake is ordering the exact estimate with no round-up. Bulk stone comes in practical amounts, and a thin layer looks unfinished. Round up to the next sensible order. A small surplus tops off low spots and feeds later touch-ups as the gravel migrates.