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 the 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.

The concrete is now available in dry mix products which are filled in bags like cement bags. So, the buyer only needs to add sufficient water to make wet concrete.

There are various brands that supply this dry mix concrete product such as Quikrete, Sakrete, and other brands in the USA.

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.

**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 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.**

S**o,** 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.

**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**

**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**

**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**

**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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