Bags, Bulk, or Ready-Mix? Where the Break-Even Is
The conversions the store won't print on the bag, and the point at which carrying 60 of them stops being the cheap option.
Concrete, mulch, and gravel all come three ways: in bags you carry, in bulk a truck dumps in your driveway, or — for concrete — mixed and delivered ready to pour. The bag is always the cheapest way to buy a little and the most expensive way to buy a lot, and the crossover point is earlier than most people think. This guide gives the conversions so you can find it for your own job.
The one number everything hangs on: 27
A cubic yard is 27 cubic feet — a cube three feet on each side. Bulk material is sold by the cubic yard (or by the ton, for stone). Bags are labeled in cubic feet or pounds. So every comparison starts by turning your job into cubic feet, dividing by 27 to get yards, and dividing by the bag's yield to get bags.
Bags per cubic yard
| Product | Yield per bag | Bags per cubic yard |
|---|---|---|
| Concrete mix, 80 lb | 0.60 cu ft | 45 |
| Concrete mix, 60 lb | 0.45 cu ft | 60 |
| Concrete mix, 50 lb | 0.375 cu ft | 72 |
| Mulch, 3 cu ft bag | 3 cu ft | 9 |
| Mulch, 2 cu ft bag | 2 cu ft | 13.5 |
| Gravel / stone, 50 lb bag | ≈ 0.5 cu ft | ≈ 54 |
| Bulk gravel or crushed stone | — | ≈ 1.4 tons per yard |
Concrete yields come straight from the manufacturer's data sheet; they're what the bag will actually make once mixed, not the dry volume of the powder. Gravel by the bag varies with the stone, which is why bulk stone is priced by weight — 1.35 to 1.5 tons per yard depending on the rock and how wet it is.
Concrete: where bags stop making sense
Worked example — a 10 × 12 ft patio, 4 inches thick.
- Volume: 10 × 12 × (4 ÷ 12) = 40 cu ft = 1.48 cubic yards
- In 80-lb bags: 40 ÷ 0.6 = 66.7 → 67 bags; call it 74 with 10% for an uneven subgrade
- Ready-mix: order 1.5 yards (plants sell in quarter-yard increments)
Now the cost, at typical 2026 prices:
| Option | Price basis | This patio | What you're not counting |
|---|---|---|---|
| 80 lb bags | $5–7 per bag | $370–520 for 74 bags | Mixer rental (~$60–90/day), 5,900 lb of lifting, 3–4 hours of mixing |
| Ready-mix | $150–190 per yard | $225–285 for 1.5 yd | Short-load fee of $50–150 on orders under about 4–5 yards; you need to be ready when the truck arrives |
Even with the short-load fee, ready-mix is roughly the same money as bags on this job and saves an afternoon of hard labor. The break-even is usually around one cubic yard — about 45 bags. Below that, bags win on convenience and no minimum order; above it, ready-mix wins on both price and outcome.
And outcome is the part people underrate. A slab needs to be placed as one continuous pour. Mixing 74 bags one at a time in a rented mixer takes long enough that the first batches start setting before the last ones go in, which leaves cold joints — weak planes running through your patio. Ready-mix arrives all at once. For anything you'll walk on, that matters more than the twenty dollars.
Where bags genuinely win: fence posts (a bag or two each, poured dry or mixed in the hole), small footings, repairs, steps, and any job where the concrete is going in over several days anyway. The concrete calculator gives you yards and bag counts for all three bag sizes so you can price both routes.
Mulch: bags for a bed, bulk for a yard
Mulch has no setting time and no cold joints, so the comparison is purely money and effort. At 2026 prices, a 2 cu ft bag runs $3–5, which works out to $40–68 per cubic yard. Bulk mulch is $30–60 per yard plus a delivery charge of $50–100, and most yards have a minimum of two or three yards.
- Under about 2 yards (roughly 27 two-cubic-foot bags): bags. The delivery fee alone would erase the savings, and bags stack in the trunk.
- Three yards and up: bulk. The per-yard saving beats the delivery fee, and you're no longer carrying 40 bags across the lawn.
Bulk mulch also comes in the varieties bags don't — arborist chips, double-ground hardwood, leaf compost — and it's usually fresher. Bagged mulch that's been baking on a pallet all summer is the source of most "my mulch smells like vinegar" complaints. The mulch calculator returns yards and bag counts for both bag sizes.
Gravel: it's by the ton
Bagged stone is the most expensive material per volume on this page — 54 bags to a yard, at $4–7 a bag, is $215–380 per yard against $40–80 per ton bulk (so $55–110 per yard at 1.4 tons). Bags make sense for a drainage trench, a few post holes, or a small path. For a driveway, a shed pad, or a French drain of any length, order bulk by the ton and have it dumped as close to the work as the truck can get.
The gravel calculator converts your area and depth to tons directly, using the density of the stone you pick — crushed limestone, pea gravel, and river rock don't weigh the same.
Quick rules
- Under 1 yard: bags, unless it's a slab.
- Slab of any size you'll walk on: ready-mix, for the continuous pour more than the price.
- 1–3 yards of mulch or stone: either; do the math with the delivery fee included.
- Over 3 yards: bulk, always.
- Any bag route: count the lifting. An 80-lb bag is 80 lb at the store, 80 lb into the truck, 80 lb out, and 80 lb into the mixer. Multiply by the bag count before you decide.
References
- Quikrete — Concrete Mix product data sheet (yield per bag): quikrete.com
- National Ready Mixed Concrete Association — ordering and placing guidance: nrmca.org
- Mulch & Soil Council — product standards and volume labeling: mulchandsoilcouncil.org