Gravel Calculator

A gravel calculator works out how much gravel you need for a driveway, path, or base — in cubic yards and in tons — and estimates the cost. Enter the length, width, and depth of your area above to get the amount to order, with an adjustable density so it matches the gravel type you’re buying.

What Does a Gravel Calculator Do?

Buying gravel is confusing because it’s measured two different ways: by volume (cubic yards) when it’s loose, and by weight (tons) when it’s sold and delivered. A gravel calculator bridges the two. You give it the area you want to cover and how deep, and it figures out the volume, then converts that volume to weight using the density of the material. This matters because ordering too little means a second delivery fee and a half-finished job, while ordering too much means wasted money and a pile of gravel you have to move. Getting the number right the first time is the whole point.

How to Use This Calculator

1. Enter the length and width of the area in feet.
2. Enter the depth in inches — how thick you want the gravel layer.
3. Adjust the density if your supplier lists a specific tons-per-cubic-yard figure (1.4 is a common average).
4. Optionally add a price per ton to estimate the cost.

How It Is Calculated

The calculator multiplies length by width to get the area in square feet, multiplies that by the depth (converted from inches to feet) to get the volume in cubic feet, and divides by 27 to convert to cubic yards, since there are 27 cubic feet in a cubic yard. It then multiplies the cubic yards by the density to get tons. Gravel typically weighs somewhere around 1.4 tons per cubic yard, but it varies by type and moisture, which is why the density is adjustable. If you enter a price per ton, the tool multiplies it by the tonnage for a cost estimate.

Choosing the Right Depth and Type

Depth makes a big difference to how much you order, so it’s worth getting right for the job. A decorative ground cover might only need an inch or two, a walking path two to three inches, and a driveway considerably more — often built up in layers of different stone sizes, with a deeper total depth for the base course beneath the surface gravel. Heavier use means more depth and a stronger base. The type of gravel matters too: pea gravel, crushed stone, river rock, and road base all have slightly different densities and behave differently underfoot and under vehicles, so check the figure your supplier gives and plug it into the density field for a more accurate weight. It’s also smart to order a little extra — gravel settles and compacts, low spots eat more than you expect, and a small surplus is cheaper than a second delivery. Many people add roughly 5 to 10 percent to the calculated amount to be safe.

Tips and Common Mistakes

• Convert depth carefully — inches, not feet — or you’ll order wildly too much.
• Use your supplier’s density figure when they provide one; it improves the tonnage estimate.
• Order a little extra (around 5–10%) for settling, compaction, and uneven ground.
• For driveways, remember you may need a deeper base layer under the surface gravel.
• Confirm whether the price is per ton or per cubic yard before comparing quotes.

Planning a Gravel Driveway or Path

A gravel project lasts far longer when it is built in the right layers rather than dumped in one go, and the calculator helps you plan each layer. A durable gravel driveway is usually built up from the ground in stages: a compacted sub-base of larger, angular stone for strength and drainage, a middle layer of medium stone, and a finer surface layer that is comfortable to walk and drive on and looks finished. Each layer has its own depth, so you can run the calculator once per layer using that layer’s depth and add the results for a total order. Angular crushed stone generally locks together and holds in place better than smooth, rounded gravel, which is why it is favored for bases and driveways, while rounded decorative stone suits paths and borders where heavy loads are not a concern. Good edging — whether timber, steel, or a paver border — keeps gravel from spreading sideways and migrating into the lawn, which both preserves your investment and reduces how much you need to top up later. Preparation underneath matters as much as the gravel itself: a well-compacted base and a landscape fabric beneath the stone help with weed control and stop the gravel from sinking into soft ground over time. When you order, account for compaction, since loose gravel settles to a smaller volume once it is driven on and rained upon, and add a margin for the low spots and uneven ground that every real site has. Buying slightly more than the bare calculation, spreading it in planned layers, and compacting as you go will give a far better and longer-lasting result than guessing — and it is the surest way to avoid a second delivery fee or a thin, short-lived surface.

Frequently Asked Questions

How much gravel do I need? Multiply the area by the depth to get volume, then convert to tons using density. Enter your dimensions above and the calculator does it in cubic yards and tons.

How many tons are in a cubic yard of gravel? Roughly 1.4 tons on average, though it varies by gravel type and moisture. Adjust the density field to match your supplier’s figure.

How deep should gravel be? It depends on use — a couple of inches for paths and decorative areas, more for driveways, which often need a deeper layered base. Heavier traffic means more depth.

Should I order extra? Yes, a little. Gravel compacts and settles and ground is rarely perfectly level, so many people add about 5–10% to avoid running short.

Is gravel sold by weight or volume? Often by the ton (weight) for delivery, but sometimes by the cubic yard (volume). The calculator gives you both so you can order either way.

This tool provides estimates only. Confirm density, depth, and coverage with your supplier before ordering.