How Many Bags of Concrete for a 5x10 Slab?
A 5 by 10 foot slab at 4 inches holds 16.67 cubic feet of concrete. How many bags of concrete for a 5x10 slab comes to 28 bags of 80 lb mix or 38 of the 60 lb size, before a spare bag or two for waste.
Concrete calculator →How the bag count is figured
- Area: 5 × 10 = 50 sq ft.
- Volume at 4 in: 50 × 0.333 = 16.67 cu ft.
- 80 lb bags: 16.67 ÷ 0.60 = 27.8, round up to 28.
- 60 lb bags: 16.67 ÷ 0.45 = 37.0, round up to 38.
Check the yield printed on your brand’s bag, since it varies a little. The concrete calculator handles other shapes.
Related: How Much Gravel for a 5x10 Walkway?
Bags by thickness for a 5x10 slab
| Thickness | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|
| 3 in | 12.50 | 21 | 28 | 42 |
| 4 in | 16.67 | 28 | 38 | 56 |
| 5 in | 20.83 | 35 | 47 | 70 |
| 6 in | 25.00 | 42 | 56 | 84 |
Is bagged mix the right call?
At 0.62 cubic yards, this pad is well under the point where a ready-mix truck starts to make sense. Many plants charge a small-load fee on tiny orders, so bags are often cheaper here, and a rented mixer makes 28 bags manageable for two people.
Related: Bags of Crushed Stone for a 5x10 Walkway
Forms and base
Dig out sod and soft soil, compact the bottom and add a few inches of compacted gravel. Set 2x4 forms level or with a slight slope for drainage, stake them every couple of feet and check the diagonals so the pad is square. Mixing 28 bags takes time, so stage them next to the forms before you start.
Buying the bags
A pallet of 80 lb bags often holds around 40 to 42 bags, so this job is about 1 pallet or less. Buy one or two extra bags: returning an unopened bag is easier than running out mid-pour.
Questions people ask
How many 80 lb bags for a 5x10 slab?
About 28 bags at 4 inches thick.
How many 60 lb bags for a 5x10 slab?
About 38 bags at 4 inches thick.
How many bags for a 5x10 slab 6 inches thick?
About 42 bags of 80 lb mix or 56 of 60 lb.
How much does an 80 lb bag of concrete yield?
About 0.6 cubic feet of mixed concrete.
When is bagged concrete practical?
Usually for jobs under about a cubic yard. Beyond that, mixing dozens of bags by hand gets slow and batches may not blend well.
Related guides
- How Much Area Does a Yard of Concrete Cover?
- How Many Bags of Concrete in a Yard? 40, 60, 80 lb
- Gravel Base Under a Concrete Slab: Depth and Tons
- How Many Yards in a Concrete Truck? Mixer Sizes
- Concrete Short Load Fee: What It Is and How to Cut It
- 60 lb vs 80 lb Concrete Bags: Yield, Count, and Cost
- Rebar vs Wire Mesh in a Slab: Which One to Use
- How Many Bags of Concrete for a 4x10 Slab?
- How Many Bags of Concrete for a 6x12 Slab?
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