How many bags of concrete do I need for a 10×10 slab? Let me clear first, here we are discussing ready-mix concrete bags. Traditionally, concrete is made by mixing cement, sand, and aggregate together to make a homogeneous dry mix. Then water is added to the mix to make concrete for different work. But now people don’t want to order each material separately and then mix them and use them for work.
How Many Bags of Concrete Do I Need? depends on the size of the slab whether it is a 10×10 slab or 10×12 etc and the size of the concrete dry mix bag you have ordered from the company.
How Many Bags of Concrete Do I Need for a 10×10 Slab?
You can find out how many bags of concrete do I need for a 10×10 Slab by following the below steps,
Step: 1 Calculate Volume of Concrete Required Pouring 10×10 Slabs
The volume of concrete can be calculated by multiplying its length, width, and thickness together.
For example,
We have a 10×10 concrete slab with a thickness of 4”
Length (L) = 10 ft Width (B) = 10 ft and Thickness = 4”
Volume of Concrete = L x B X T
Volume of Concrete = 10 x 10 x (0.33) (Because 12” = 1 ft, 4/12 = 0.33)
Volume of Concrete = 33.3 cu. ft.
It Is equal to 0.95 cu. m and 1.23 cu. yard
Explanation:
3 ft = 1 yard, 3 ft x 3 ft x 3 ft = 1 yard x 1 yard x 1 yard
27 cu ft = 1 cu. yard.
So, By dividing 33.3 cu. ft with 27 we will get the volume of concrete in cu. yard.
Volume of Concrete = 33.3 / 27 = 1.23 cu. yard
Step: 2 Add 10% Extra Volume
Add 10% Extra Volume to original volume for dry volume and wastage during pouring concrete
= 1.23 cu. yard x 10 %
= 1.23 x (10/100)
= 0.122
Total Volume of Concrete = 1.23 + 0.122 (10% Extra)
= 1.35 cu yard
Step: 3 To Find Out How Many Bags of Concrete Do I Need
To find how many bags of concrete do I need to pour the concrete slab divide the volume of concrete by yield of concrete bag used for making concrete.
There are different sizes and weights of concrete bags available on the market such as 40lb, 45lb, 60lb, 80lb, and 90lb.
The following table shows the size of concrete bags and their specific yield value.
| Bag Size | Yield |
| 40 lb. (18.1 kg) | 0.30 cu. ft. (0.008 cu. m) |
| 45 lb. (20.4 kg) | 0.34 cu. ft. (0.01 cu. m) |
| 60 lb. (27.2 kg) | 0.45 cu. ft. (0.012 cu. m) |
| 80 lb. (36.2 kg) | 0.60 cu ft. (0.016 cu. m) |
| 90 lb. (40.8 kg) | 0.68 cu. ft. (0.02 cu. m) |
From the above table, if we use a 40lb bag of concrete for the pouring slab, its yield value is 0.011 cu. yard
Its means, 40 lb bag of concrete can pour 0.011 cu. yard of concrete.
So, for 1.35 cu yard of concrete how many bags of concrete do I need?
It is calculated by dividing the total volume of concrete by the yield value of bags of concrete.
1.35/0.011
= 122 Bags of concrete I need
So, For a 10×10 Slab with 4” thickness, we need around 122 bags of concrete.
Read More: How Many Yards In a Ton
Different Brands of Dry Mix Concrete Bags
1. QUIKRETE
QUIKRETE Rip Rap is a properly proportioned mixture of portland cement, graded sand, and other approved ingredients that can be packaged in various bags.
Examples of the types of bags include biodegradable paper, fiberglass scrim-reinforced paper, or burlap bags for erosion control applications.
Quikrete Rip Rap is available in the following weight
- 60 lb (27.2 kg) Paper Bag (No. 1129-60)
- 60 lb (27.2 kg) Burlap Bag (No. 1129-61)
- 60 lb (27.2 kg) Poly Bag (No. 1129-62)
- 60 lb (27.2 kg) Scrim Bag (No. 1134-60)
- 80 lb (36.2 kg) Paper Bag (No. 1129-80)
- 80 lb (36.2 kg) Scrim Bag (No. 1134-80)
2. Sakrete
The Sakrete original bagged concrete mix, trusted by pros since 1936. This professional-grade mix delivers consistent performance, high strength, and a smooth finish that makes it ideal for every concrete project from slabs to footings and everything in between.
| Bag Size | Yield |
| 40 lb. (18.1 kg) | 0.30 cu. ft. (.008 cu. m) |
| 45 lb. (20.4 kg) | 0.34 cu. ft. (.01 cu. m) |
| 60 lb. (27.2 kg) | 0.45 cu. ft. (.012 cu. m) |
| 80 lb. (36.2 kg) | 0.60 cu ft. (.016 cu. m) |
| 90 lb. (40.8 kg) | 0.68 cu. ft. (.02 cu. m) |
How Many Bags of Concrete Do I Need For 10×10 Slab with 4” thickness
Volume of Concrete = 10 x 10 x (4/12) = 33.3 cu. ft
Divide 33.3 with 27 to get volume in cu yard. (27 cu ft = 1 cu yard)
33.3/27 = 1.23 cu yard
Add 10 % extra = 1.23 + (1.23 x 10 %)
Volume of Concrete = 1.35 cu yard
No of Bags of concrete = 1.35/0.011 = 122 bags
| Size | Yield (cu. ft) | Yield (cu. m) | Yield (cu. yard | Nos of Bags |
| 40lb | 0.30 | 0.008 | 0.011 | 122 |
| 45lb | 0.34 | 0.009 | 0.012 | 112 |
| 60lb | 0.45 | 0.012 | 0.016 | 84 |
| 80lb | 0.60 | 0.016 | 0.022 | 61 |
| 90lb | 0.68 | 0.019 | 0.025 | 54 |
How Many Bags of Concrete Do I Need For 10×10 Slab with 5” thickness
Volume of Concrete = 10 x 10 x (5/12) = 41.6 cu. ft
Divide 41.6 with 27 to get volume in cu yard. (27 cu ft = 1 cu yard)
33.3/27 = 1.54 cu yard
Add 10 % extra = 1.54 + (1.54 x 10 %)
Volume of Concrete = 1.69 cu yard
No of Bags of concrete = 1.69/0.011 = 154 bags
| Size | Yield (cu. ft) | Yield (cu. m) | Yield (cu. yard) | Nos of Bags |
| 40lb | 0.30 | 0.008 | 0.011 | 154 |
| 45lb | 0.34 | 0.009 | 0.012 | 141 |
| 60lb | 0.45 | 0.012 | 0.016 | 106 |
| 80lb | 0.60 | 0.016 | 0.022 | 77 |
| 90lb | 0.68 | 0.019 | 0.025 | 68 |
How Many Bags of Concrete Do I Need For 10×10 Slab with 6” thickness
Volume of Concrete = 10 x 10 x (6/12) = 41.6 cu. ft
Divide 50 with 27 to get volume in cu yard. (27 cu ft = 1 cu yard)
50/27 = 1.85 cu yard
Add 10 % extra = 1.85 + (1.85 x 10 %)
Volume of Concrete = 2.035 cu yard
No of Bags of concrete = 2.035/0.011 = 185 bags
| Size | Yield (cu. ft) | Yield (cu. m) | Yield (cu. yard | Nos of Bags |
| 40lb | 0.30 | 0.008 | 0.011 | 185 |
| 45lb | 0.34 | 0.009 | 0.012 | 170 |
| 60lb | 0.45 | 0.012 | 0.016 | 127 |
| 80lb | 0.60 | 0.016 | 0.022 | 93 |
| 90lb | 0.68 | 0.019 | 0.025 | 81 |
How Many Bags of Concrete Do I Need For 10×10 Slab with 8” thickness
Volume of Concrete = 10 x 10 x (8/12) = 41.6 cu. ft
Divide 66.7 with 27 to get volume in cu yard. (27 cu ft = 1 cu yard)
66.7/27 = 2.47 cu yard
Add 10 % extra = 2.47 + (2.47 x 10 %)
Volume of Concrete = 2.717 cu yard
No of Bags of concrete = 2.717/0.011 = 247 bags
| Size | Yield (cu. ft) | Yield (cu. m) | Yield (cu. yard | Nos of Bags |
| 40lb | 0.30 | 0.008 | 0.011 | 247 |
| 45lb | 0.34 | 0.009 | 0.012 | 226 |
| 60lb | 0.45 | 0.012 | 0.016 | 170 |
| 80lb | 0.60 | 0.016 | 0.022 | 124 |
| 90lb | 0.68 | 0.019 | 0.025 | 109 |
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