Concrete bags to cubic yards
One cubic yard is 27 cubic feet of concrete. Here's what that means in bags — and where the bag math stops making sense.
Bags to yards — the quick numbers
- 1 cubic yard
- 27 ft³ of mixed concrete
- 80 lb bags per yard
- 45 bags
- 60 lb bags per yard
- 60 bags
- Weight to mix by hand
- 3,600 lb per yard
- Metered delivery in FL
- typical $150–$220/yd³ all-in
Bags per cubic yard, by bag size
Every bag size mixes to the same 3,600 lb per yard — smaller bags just split it into more lifts:
| Bag size | Yield per bag | Bags per yd³ | Total weight |
|---|---|---|---|
| 40 lb | 0.30 ft³ | 90 bags | 3,600 lb |
| 50 lb | 0.375 ft³ | 72 bags | 3,600 lb |
| 60 lb | 0.45 ft³ | 60 bags | 3,600 lb |
| 80 lb | 0.60 ft³ | 45 bags | 3,600 lb |
| 90 lb | 0.675 ft³ | 40 bags | 3,600 lb |
Yields are the standard manufacturer figures for premixed concrete; actual yield varies slightly by brand and water ratio.
When bags stop making sense
Bags are the right call for a couple of post holes or a repair. But a yard of concrete is forty-five 80-lb bags: hauled from the store, lifted into a mixer one at a time, and placed before the first batches start to set — a real problem in Florida heat.
From about one yard up, a metered truck mixes the entire pour on-site to a single spec and bills only the yards actually poured, to the quarter yard. No leftover bags, no under-ordering, no mixer rental.
Size your pour, skip the bags
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Frequently asked questions
How many 80 lb bags of concrete are in a cubic yard?
45 bags. An 80 lb bag yields about 0.60 cubic feet of mixed concrete, and a cubic yard is 27 cubic feet: 27 ÷ 0.60 = 45. That's 3,600 lb of material to haul, mix and place by hand.
How many bags do I need for a 10 × 10 slab?
A 10 × 10 ft slab at 4 in thick is 33.3 cubic feet — about 56 80-lb bags, or 61 with a 10% waste factor. At that size a 1.5 yd³ metered load is usually cheaper than the bags and hours faster. Size it in the slab calculator.
Is it cheaper to mix bags or order a small load?
Below roughly half a yard, bags win. Near a full yard the math flips: 45 80-lb bags at Florida store prices run roughly $250–$340 in material alone, before the mixer rental and your day of labor — while metered small-load delivery in Florida typically runs $150–$220 per yard, mixed and placed chute-ready.
Why does hand-mixed bag concrete crack more often?
Consistency. Forty-five separate batches mean forty-five slightly different water ratios, and Florida heat shortens working time — late batches get extra water, which weakens the mix. A metered truck mixes the whole pour to one spec.