Both, Depending on Who You Call
Compost is sold both ways, and which one you get quoted depends entirely on what kind of operation you dialed. Most bulk yards that deal with homeowners quote compost by the cubic yard, which is a volume unit. Larger facilities, transfer stations, and some municipal composting operations quote by the ton, which is a weight unit. That is usually because they run every truck across a scale anyway and a weight ticket is how their whole yard is built.
Neither unit is a trick. They come from different corners of the same industry. Scale based pricing is completely standard for any operation that also moves sand, gravel, and stone, because those materials have always been sold by weight and the scale is already there. Volume pricing is standard where the product is loose organic material going into a homeowner's pickup or a small dump truck.
The trouble starts the moment you try to compare the two quotes side by side. A cubic yard is a fixed amount of space. A ton is not a fixed amount of space. That is the entire problem in one sentence.
A cubic yard is 27 cubic feet. Picture a box three feet wide, three feet deep, and three feet tall. That number never changes and it never will. What changes is how much that box weighs when you fill it with compost, and it can change a lot.
Key takeaway: you are buying space in your garden beds, so volume is the unit that matters to you. Weight is the unit that matters to the truck.
Why a Cubic Yard of Compost Has No Fixed Weight
Published figures for the weight of a cubic yard of compost run from somewhere around 500 lbs on the light, dry, fluffy end all the way up to about 1,400 lbs on the heavy, wet, dense end. A commonly cited average, drawn from surveying a range of suppliers, is about 1,250 lbs per cubic yard, which works out to roughly 46 lbs per cubic foot. Wet compost from that same survey runs about 10 percent heavier, closer to 1,370 lbs per cubic yard.
Run those numbers in the other direction and you see why a ton quote is slippery. Depending on what the material is made of and how wet it is, a ton of compost can be anywhere from well under a yard and a half to close to four cubic yards. That is a spread wide enough to blow up any budget built on a generic conversion you found online.
Moisture is the biggest swing factor
Finished compost behaves like a sponge. It holds water in the pore spaces between particles and inside the organic particles themselves. A pile that sat uncovered through a rainy week weighs meaningfully more per yard than that exact same pile after a stretch of hot dry weather. None of that extra weight is compost. It is water.
Water does not feed your plants. It does not spread further across a bed. It does not raise the grade of a planting area by a single fraction of an inch. It evaporates out of the pile sitting in your driveway over the next few days, and what is left is the material you actually wanted in the first place.
Feedstock matters too
Beyond moisture, the base material changes the weight. Screened leaf and yard waste compost tends to be on the lighter, fluffier side. Manure based compost and mushroom compost tend to be denser and to hold more moisture, so they weigh more per yard. Anything blended with sand or screened topsoil is heavier still, because mineral content is simply heavier than decomposed plant matter.
The practical upshot is this. If a supplier sells by the ton, the amount of material you receive for that ton is determined by conditions at their pile on the day they load you. The feedstock, the last time it was turned, and last week's weather all decide it. You have no control over any of that.
The Real Cost of Buying Water
Here is the scenario that catches people. You call on a Tuesday after four straight days of rain. The pile is uncovered and saturated right through. You pay the per ton rate, the loader operator fills the truck, the ticket prints, and you get noticeably fewer cubic yards spread across your beds than you would have gotten from that same pile in dry weather.
Nothing dishonest happened. The scale did its job and reported exactly what crossed it. You just happened to buy on a day when a meaningful share of that weight was rainwater.
The reverse works in your favor, and it is worth knowing. A ton of light, dry, well screened compost stretches further across your beds than a ton of soggy material from the same yard. If you buy by weight during a dry stretch, you come out ahead on volume. That is the whole point. Per ton pricing is a moving target. Per yard pricing is not. A yard is a yard whether it rained Monday or not.
One caveat that deserves to be said plainly. Wet compost is not bad compost. Moisture is normal and even desirable in living compost, and a pile that has been baked bone dry is not doing your soil any favors either. This has nothing to do with quality. It is purely about which unit is printed on the invoice.
A few things worth asking before you commit to a weight based order.
- Is the pile covered or stored under a roof, or is it open to the weather.
- When was it last turned or screened. Freshly screened material is usually fluffier and lighter per yard.
- If it has poured for three days straight and the pile is uncovered, can your project wait until the end of the week. Often it can, and a few dry days make a real difference.
How to Compare a Ton Quote to a Yard Quote
You cannot compare two numbers in different units. You have to put both quotes into the same unit first, and the unit you want is cubic yards, because that is the unit your project is measured in.
Step one. Decide what your project needs in cubic yards, not tons. Coverage is a volume problem from start to finish. Square footage times depth gives you volume, and weight never enters into it. There is coverage math further down this page if you need it.
Step two. Ask the per ton supplier for their working conversion. Any serious yard knows approximately how many cubic yards a ton of their compost runs, because customers ask them constantly and their loader operators have a feel for it. If nobody at the counter will or can give you a number, that is useful information all by itself.
Step three. Convert their number into a per yard price so both quotes match. If a supplier tells you a ton of their compost is roughly two cubic yards, divide the ton price by two and set that next to the other quote. Now you are comparing two numbers that mean the same thing.
Step four. Add delivery to both sides before you pick a winner. Delivery is very often priced per load or per trip rather than per unit of material, so the cheaper material price can easily lose to a bigger trip fee. Ask what the maximum load size is and whether one trip covers your entire order or whether you are paying for two.
Step five. Ask what the truck actually drops in your driveway. Some weight based suppliers cap loads by legal weight limit rather than by the volume you ordered. On a wet day that can mean a truck that looks half empty and a ticket that says you got your full tonnage.
Four questions worth asking word for word when you call.
- How many cubic yards is a ton of your compost right now.
- Is the pile covered.
- Is delivery priced per load or per yard.
- Is there a minimum order.
Turning Either Unit Into Square Feet
Here is the arithmetic that actually decides your order size. One cubic yard is 27 cubic feet. Spread one inch deep, a cubic yard covers about 324 square feet. Spread two inches deep, it covers about 162 square feet. Spread three inches deep, it covers about 108 square feet. Every other compost coverage question is a variation on those three numbers.
Now match the depth to the job.
- Topdressing a lawn or established beds. A thin skim, usually well under an inch. You want the existing plants and grass blades still visible, not buried.
- Refreshing garden beds. Commonly one to two inches laid over the existing soil surface.
- Amending a new bed. A thicker layer spread on top and then worked down into the existing soil before planting. This is where compost orders get big in a hurry, because you are filling volume rather than covering surface.
A worked example. Say you have a vegetable garden that measures 20 feet by 25 feet. That is 500 square feet. At two inches deep, 500 divided by 162 gives you a bit over three cubic yards. So you need three yards, maybe a shade more. Only after you have that number do you need to care whether your supplier calls it a three yard order or a ton and a half order.
Round up rather than down. Compost settles, beds are rarely perfectly rectangular, and a partial second delivery almost always costs more in trip fees than the extra material would have cost you on the first load. A little leftover compost has a hundred uses. A short order means either a bare patch or a second delivery charge.
If you would rather not run the multiplication by hand, a volume calculator will take your length, width, and target depth and hand you the cubic yards.
Bagged Compost and Why the Units Change Again
Walk into a garden center and the units shift on you one more time. Retail bags are usually labeled by volume in cubic feet, although some compost bags are sold by weight instead. Common bag weights land in the 40 to 45 lb range, which tells you nothing reliable about volume for exactly the moisture reasons already covered.
As a rough sense of scale, it takes a large number of standard bags to make up a single cubic yard. Figure on the order of a dozen to twenty bags depending on the size, and one published figure puts a cubic yard at about 15 fifty liter bags. Either way, filling a three yard vegetable garden out of bags means a lot of trips, a lot of lifting, and a mountain of plastic to get rid of afterward.
Once you are past a yard or so, bulk compost is almost always cheaper per unit of material, and you skip the bag disposal and the repeat trips entirely.
Bags still win in a few real situations. Filling containers or a single raised bed. No place to dump a pile. A shared driveway you cannot block, or a tight urban lot with no truck access. In those cases the premium is just the cost of convenience and it is often worth paying.
One last note. Bagged compost sitting outside on a pallet through a rainy week is subject to the same moisture story as a bulk pile. If the bag is labeled by volume, a heavier bag is not a better value. It is a wetter bag.
How We Started
We started Mulch Mound because we got tired of the hassle that came with buying landscaping materials. The options were either loading bags into your car at a garden center or calling around to local suppliers, trying to figure out pricing, minimums, and delivery schedules. Neither option felt convenient or transparent.
Three of us – Alec, Mo, and Tyler – decided there had to be a better way. Alec and Tyler got their start back in 2013 running a landscaping business during college, moving mulch and mowing lawns to pay tuition. That experience taught them how frustrating it was to source materials, and years later, that frustration turned into Mulch Mound.
We focus on making it simple to get mulch, stone, and soil delivered directly to your home. Order online, pick your delivery date, and we handle the rest. No loading bags. No calling multiple suppliers. No wondering if you bought enough or paid a fair price.
We work with quality local suppliers in the areas we serve and aim to be straightforward about what we offer and what it costs. Landscaping is hard work. Buying the materials for it shouldn't be.
Frequently asked questions
How many cubic yards are in a ton of compost?
Across the published range, roughly one and a half to close to four cubic yards per ton. Most screened garden compost lands somewhere in the middle of that. The range is wide because the conversion depends on both feedstock density and moisture at the moment of loading, and neither of those is constant from one yard to the next or from one week to the next.
The safe move is to ask your specific supplier what their product is running today rather than pulling a generic figure off the internet. And the fact that the honest answer to this question is a range rather than a number is precisely why ordering by the yard is simpler for most homeowners.
Is it cheaper to buy compost by the ton or by the cubic yard?
It depends more on quantity and delivery structure than on the material rate. Per ton pricing tends to show up at high volume and municipal operations, and at large quantities it can be genuinely cheap, which is why contractors and landscapers often buy that way. For a homeowner buying three or four yards, the per yard supplier is usually easier to compare against competitors and far easier to budget for, because the number on the quote is the number you get.
In practice the delivery structure often decides the whole thing. A per trip delivery fee added to a small order can outweigh any savings on the material itself, so always price the full delivered order rather than the rate per unit.
Will a cubic yard of compost fit in my pickup?
A standard half ton pickup is typically not rated to carry a full cubic yard of wet compost in a single trip. Volume is not the limit here, payload is. Plan on multiple trips or just take the delivery, especially if the material has been sitting in the weather.
Also worth knowing before you load, compost mounds well above the bed rails when a loader bucket drops it in, and it is light enough at the surface to blow out on the highway. Bring a tarp and straps. A plastic bed liner makes the shoveling out considerably easier, and a bed without a liner will hold fine compost in the seams for a long time.
Does compost settle after it is spread?
Yes, and you should plan for it. Screening and loading fluff compost up with air. Once it is spread, rain packs it down, foot traffic packs it down further, and the fine particles work into the soil surface below. A topdressing layer that looked right on day one often looks noticeably thinner a couple of weeks later.
Order for the depth you want at the end, not the depth you want the afternoon the truck leaves. On a bed refresh, spreading slightly heavier than your target is the easier correction to make.
Can I leave a compost pile in my driveway for a week?
A few days is usually fine. A full week starts to cause problems. Wet organic material can stain concrete and pavers, and grass under the edges of a pile will yellow and then die once it has been covered and starved of light for several days.
If the surface matters to you, put a tarp down before the truck backs in and have the driver drop on the tarp. When you start moving it, take the wettest material at the bottom and the edges first, since that is what does the staining. Covering the top of the pile with a second tarp also keeps a fresh rain from soaking material you are about to shovel.