How Much Concrete for a 3x3 Pad?
Concrete needed
0.12 cubic yards
A 3 by 3 foot pad at four inches, with ten percent on top for waste.
It does not stop at a number.
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How that number is worked out
These are the figures this page was built with and every line the calculator produces from them. Change anything above and all of it moves.
- Length3 ft
- Width3 ft
- Thickness4 in
- Waste allowance10 %
Concrete needed0.12 cubic yards
| Volume | 3 cu ft |
|---|---|
| Cubic yards before waste | 0.11 |
| Cubic yards with 10% waste | 0.12order to this number |
| Order in quarter yards | 0.25 cu yd |
| 60 lb bags, if bagging it | 8 |
| 80 lb bags, if bagging it | 6 |
The material list this produces
| Ready mix concrete, cubic yards | 0.25 |
|---|---|
| Rebar or mesh, sq ft of slab | 9 |
| Form lumber, linear ft | 12 |
Thickness compared
The same slab at four thicknesses.
| Thickness | Concrete needed |
|---|---|
| 4 in | 0.12 cubic yards |
| 5 in | 0.15 cubic yards |
| 6 in | 0.18 cubic yards |
| 8 in | 0.24 cubic yards |
What else matters here
Three cubic feet. At this size it is a bag job: six eighty pound bags.
What this calculator assumes
- One cubic yard is 27 cubic feet. A 4 inch slab is one third of a foot thick, not 4.
- A 60 lb bag yields about 0.45 cubic feet and an 80 lb bag about 0.60. Bags are for small pours only; past about one cubic yard, ready mix is cheaper and far less work.
- Ready mix is usually sold in quarter yard steps with a short load fee below one yard.
Questions people ask
How many bags of concrete for a 3x3 pad?
About 8 sixty pound bags or 6 eighty pound bags at 4 inches thick, including a ten percent waste allowance.
Different numbers?
The concrete calculator takes any dimensions you like and hands back the same list.