Key Takeaways
- Bulk is cheaper per ton; bags win on delivery and convenience
- The crossover point is usually around 1 to 2 tons, depending on delivery fees
- Bags win when material must be carried through a house or into tight access areas
- Bulk wins for anything above a few tons where a truck can reach the site
- The cost calculator compares both options with your real numbers
This calculation follows standard aggregate industry methodology.
Cubic yard is a unit of volume equal to a cube measuring 3 feet on each side, commonly used in the US for ordering gravel and other aggregates.
Density in gravel calculations refers to the weight of material per unit volume, typically measured in tons per cubic yard or tonnes per cubic metre.
The usual answer is “bulk is cheaper”, and past a certain quantity that is true. But the quantity is the whole question, and the thing that decides it is not the price of the gravel. It is the delivery fee.
Two different cost shapes
Bagged gravel has a high price per unit and, usually, no delivery charge. You put it in the car. The cost curve is a straight line through the origin: twice as many bags costs twice as much, forever.
Bulk gravel has a low price per ton and a delivery fee that barely moves between one ton and ten. The cost curve starts high, because of that fee, and then rises slowly.
Two lines like that cross exactly once. Below the crossing point bags win. Above it bulk wins, and keeps winning by a widening margin.
Where the crossing usually falls
Somewhere around a ton, in most places, but that is a weak generalisation and it is not worth trusting with your own money. The crossing point moves with the delivery fee more than with anything else. A yard that delivers for a modest flat fee makes bulk attractive at a much smaller quantity than a yard that charges heavily for a short run.
This is why the cost calculator asks for your two quotes rather than assuming either one. Put in the price per ton, the delivery fee and the price per bag, and it works out which is cheaper for the quantity you actually need.
Count whole bags
There is one detail that quietly matters in this comparison. Bags are counted, not measured. If a job needs 133.3 bags, you buy 134.
Comparing on a fractional bag count flatters the bagged option by precisely the amount that makes the comparison misleading, and on a small job that rounding can be several percent. The bag calculator always rounds up and shows the exact figure alongside, so you can see both.
When bags win regardless of price
Price is not the only variable, and sometimes it is not the deciding one.
Bags win when the material has to be carried through a house, up steps, or into a back garden a truck cannot reach. They win when there is nowhere to tip a pile, or when tipping one would block a driveway you need. They win when you want to buy in stages rather than committing to a full load, and when the job is small enough that a delivery fee would dominate everything.
They also win when you are not sure how much you need. Buying forty bags and returning six is easier than ordering three tons and discovering you needed two.
When bulk wins regardless of price
Bulk wins on anything above a ton or two where a truck can reach the site, which covers most driveways, patios and drainage work. The price per unit is not close at that scale, and the labour of opening and emptying eighty bags is worth something too, even if it never appears on either quote.
The practical approach
Get both quotes. Run them through the calculator with your real quantity. Then factor in the things the calculator cannot see: whether the truck can get in, whether you have somewhere to put a pile, and how far you would be carrying bags.
The number usually points at bulk. The site conditions occasionally overrule it.
Editorial note: This article is reviewed for accuracy and updated regularly. All calculations use standard industry formulas. For the latest density figures, consult your gravel supplier directly.
Frequently asked questions
Is bulk gravel always cheaper than bags?
Bulk is cheaper per ton past about 1 to 2 tons. Below that, bags can be cheaper because you avoid the delivery fee. The crossover point depends on the delivery fee and the price per bag in your area.
How many bags of gravel equal a ton?
It depends on bag size. A 50-pound bag gives you exactly 40 bags per ton. A 40-pound bag gives 50 bags. A 25-kilogram bag gives about 37 bags. The bag calculator handles all common sizes.
When should I buy bags instead of bulk?
Buy bags when you need to carry material through a house, up steps, or into a back garden a truck cannot reach. Bags also work when the job is small, when you want to buy in stages, or when you are not sure how much you need.
How do I know if I need bulk delivery?
If your project requires more than 2 tons and a truck can reach the site, bulk delivery is almost always cheaper. Use the cost calculator to compare your specific quotes and quantities.