**How many bags of concrete do I need for a 4×4 slab** | how much concrete do I need for a 4×4 slab | how many yards of concrete do I need for a 4×4 slab | how many cubic feet of concrete do I need for a 4×4 slab | How many bags of concrete do I need for a 4×4 slab at 4″ thick | How many bags of concrete do I need for a 4×4 slab at 5″ thick | How many bags of concrete do I need for a 4×4 slab at 6″ thick | how many m3 of concrete do I need for a 4×4 slab.

A bag of concrete ready mix made of blended mix of Portland cement, sand gravel and other approved ingredient or admixture, generally, dry ready mix concrete are available in different bag size and weight condition such as 40lb, 60lb bag, 80lb bag, 90lb bag and etc.

Regardless of size you need to calculate the volume of concrete in cubic yard or in cubic feet or in cubic meter or in rmc truck before ordering the mixed concrete. Volume is calculated by multiplying length, width and depth of slab. Here you have given a slab of 4 feet in length and 4 feet in wide, what is thickness of slab?, it’s depend on, is this a slab on the ground or it is elevated, rules differ for both, since failure of ground slab would not kill anyone whereas failure of an elevated slab could.

Thumb rules involves the safety factor that deciding the thickness of slab, 4 inch thick is generally for ground slab, heavy traffic and heavy load, you should take depth 5 or 6 inch thick and for an elevated slab generally thickness should be 5″ to 6″, and 4 inch thick is also made to use in normal conditions.

Generally standard thickness of slab is 4 inch thick in normal conditions, if **4×4 slab** have heavy traffic and heavy load, you should take depth 5 or 6 inch thick. In this article we have to calculate required quantity of concrete in cubic yard & in cubic feet and cubic meter for a 4×4 (16 sq ft) slab at 4 inch, 5 inch or 6 inch thick.

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Weight of Ready mix concrete in dry condition is about 133 lbs per cubic foot, 3600 lbs per cubic yard, or approximately equal as 2136 kg per cubic meter. The weight of concrete is determined by its density, which can vary based on the amount of aggregate, water, and air in the mix.

In United States, based on Imperial and US customary measurement system, 1 cubic yard is unit of measurement of volume represented by 3 feet long by 3 feet wide by 3 feet depth (3’×3’× 3′ = 27 cubic feet), so 1 cubic yard is equal to 27 cubic feet.

**How many bags of concrete do I need for a 4×4 slab**

To determine the how much concrete do I need for a 4×4 slab & how many bags of concrete do I need for this, you can solve in following steps:-

**Step 1 :-** calculate the volume in cubic feet:- you have given 4×4 slab (length × width), consider it is 4 inch thick, 4 inch = 0.33 feet, to determine the volume of slab, you need to multiply all dimensions, such that = 4′×4′× 0.33′ = 5.28 cubic foot, at 5 inch thick, volume of slab is 4′×4′× 0.416 = 6.66 cubic foot and at 6 inch thick, volume of slab is 4′×4′× 0.5 = 8 cubic foot.

**Step 2 :-** converting cubic feet into cubic yard:- now converting into cubic yard, you should divide it by 27, so volume of concrete you needed for 4×4 slab at 4 inch thick in cubic yard = 5.28/27 = 0.20 cubic yards, at 5 inch thick = 6.66/27 = 0.247 cubic yards & at at 6 inch thick = 8/27 = 0.296 cubic yards.

**Step 3:-** add 10% extra which would be wastage during mixing and pouring.

**Step 4:-** to determine how many bags of concrete you will need, divide the total cubic yards needed by the yields, as you know premixed bag of concrete available in 40lb, 60lb & 80lb. 40lb bag of concrete yields about 0.011 cubic yards, 60lb bag of concrete yields about 0.017 cubic yards and 80lb bag of concrete yields about 0.022 cubic yards.

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**Number of bags of concrete for a 4×4 slab at 4 inch thick**

To determine how many bags of concrete you will need, divide the total cubic yards needed by the yields, at 4 inch thick, for a 4×4 slab you will need 0.20 yards of concrete, so number of 80lb bag of concrete = 0.2 ÷ 0.022 = 9 bags, No. of 60lb bag = 0.2 ÷ 0.017 = 12 bags & No. of 40lb bag = 0.20 ÷ 0.011 = 18 bags.

At 4 inches thick, for a 4×4 slab, you will need approximately either 12 bags of 60- pound or 9 bags of 80- pound or 18 bags of 40- pound of premixed concrete. At 5 inches thick slab, either 15 bags of 60- pound or 12 bags of 80- pound premixed concrete are required, while at 6 inches thick slab, either 18 bags of 60- pound or 14 bags of 80- pound premixed concrete is necessary.

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**Number of bags of concrete for a 4×4 slab at 5 inch thick**

To determine how many bags of concrete you will need, divide the total cubic yards needed by the yields, at 5 inch thick, for a 4×4 slab you will need 0.247 yards of concrete, so number of 80lb bag of concrete = 0.247 ÷ 0.022 = 12 bags, No. of 60lb bag = 0.247 ÷ 0.017 = 15 bags and No. of 40lb bag = 0.247 ÷ 0.011 = 23 bags.

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**Number of bags of concrete for a 4×4 slab at 6 inch thick**

To determine how many bags of concrete you will need, divide the total cubic yards needed by the yields, at 6 inch thick, for a 4×4 slab you will need 0.296 yards of concrete, so number of 80lb bag of concrete = 0.296 ÷ 0.022 = 14 bags, No. of 60lb bag = 0.296 ÷ 0.017 = 18 bags and No. of 40lb bag = 0.296 ÷ 0.011 = 27 bags.

**How much concrete do I need for a 4×4 slab**

You will need approximately 0.20 cubic yards or 5.28 cubic feet or 0.15 m3 (either 12 bags of 60lb or 9 bags of 80lb) of premixed concrete for a 4×4 slab at 4 inches thick, at 5 inches thick slab, 0.247 cubic yards or 6.66 cubic feet or 0.189 m3 (either 15 bags of 60lb or 11 bags of 80lb) of premixed concrete are required, while at 6 inches thick slab, 0.296 cubic yards or 8 cubic feet or 0.227 m3 (either 18 bags of 60lb or 14 bags of 80lb) of premixed concrete is necessary.

**How many yards of concrete do I need for a 4×4 slab**

You will need 0.20 cubic yards of premixed concrete for a 4×4 slab at 4 inches thick, at 5 inches thick slab, 0.247 cubic yards of premixed concrete are required, while at 6 inches thick slab, 0.296 cubic yards of premixed concrete is necessary.

**How many cubic feet of concrete do I need for a 4×4 slab**

You will need 5.28 cubic feet of premixed concrete for a 4×4 slab at 4 inches thick, at 5 inches thick slab, 6.66 cubic feet of premixed concrete are required, while at 6 inches thick slab, 8 cubic feet of premixed concrete is necessary.

**How many m3 of concrete do I need for a 4×4 slab**

You will need 0.15 cubic meter of premixed concrete for a 4×4 slab at 4 inches thick, at 5 inches thick slab, 0.189 cubic meter of premixed concrete are required, while at 6 inches thick slab, 0.227 cubic meter of premixed concrete is necessary.

**How many bags of concrete do I need for a 4×4 slab**

You will need approximately either 12 bags of 60- pound or 9 bags of 80- pound (0.20 cubic yards, or 5.28 cubic feet, or 0.15 m3) of premixed concrete for a 4×4 slab at 4 inches thick.

To determine how many bags of premixed concrete you will need, divide the total cubic yards needed by the yield. Use the following yields per each bag size: A 40 pound bag yields 0.011 cubic yards, 60 pound bag yields 0.017 cubic yards, 50 pound bag yields 0.0138 cubic yards and 80 pound bag yields 0.022 cubic yards.

If you measure their yields in cubic feet, then yields per each bag size are following: A 40 pound bag yields 0.30 cubic feet, 60 pound bag yields 0.45 cubic feet, 50 pound bag yields 0.375 cubic feet and 80 pound bag yields 0.60 cubic feet.

To figure the amount of yards of concrete you will need, take the all measurements Length in feet, width in feet and thickness in inches. Convert thickness in feet. Multiply its length, width and thickness to get cubic footage. Multiply the total cubic footage by 0.037 to get total yards of concrete needed.

If you have a 4×4 slab, you would need approximately 0.196 yards (5.28 cubic feet, or either 9- 80lb, 12- 60lb bags) of concrete at 4″ thick, 0.2472 yards (6.68 cubic feet, or either 12- 80lb, 15- 60lb bags) of concrete at 5″ thick, 0.148 yards (4 cubic feet, or either 7- 80lb, 9- 60lb bags) of concrete at 3″ thick, or 0.296 yards (8 cubic feet, or either 14- 80lb, 18- 60lb bags) of concrete at 6″ thick.

**How many bags of concrete do i need for a 4×4 slab at 4 inches thick**

At 4 inches thick, for a 4×4 slab, you would need either 9 80-Pound, 12 60-pound, 15 50-pound, or 18 40-pound bags of premixed concrete. If you measure in cubic yards or cubic feet, then 0.196 cubic yards or 5.28 cubic feet of concrete will be required.

**Let’s do calculation and proceeds following steps:**

● 4″ thickness in feet = 4/12 = 0.33′

● Volume of concrete in cubic feet = 4 × 4 × 0.33 = 5.28

● Volume of concrete in yards = 5.28 × 0.037 = 0.196 yards.

● No. of 80lb bags = 5.28/0.60 = 9 bags

● No. of 60lb bags = 5.28/0.45 = 12 bags

● No. of 50lb bags = 5.28/0.375 = 15 bags

● No. of 40lb bags = 5.28/0.30 = 18 bags

**How many bags of concrete do i need for a 4×4 slab at 5 inches thick**

At 5 inches thick, for a 4×4 slab, you would need either 12 80-Pound, 15 60-pound, 18 50-pound, or 23 40-pound bags of premixed concrete. If you measure in cubic yards or cubic feet, then 0.2472 cubic yards or 6.68 cubic feet of concrete will be required.

**Let’s do calculation and proceeds following steps:**

● 5″ thickness in feet = 4/12 = 0.417′

● Volume of concrete in cubic feet = 4 × 4 × 0.417 = 6.68

● Volume of concrete in yards = 6.68 × 0.037 = 0.2472 yards.

● No. of 80lb bags = 6.68/0.60 = 12 bags

● No. of 60lb bags = 6.68/0.45 = 15 bags

● No. of 50lb bags = 6.68/0.375 = 18 bags

● No. of 40lb bags = 6.68/0.30 = 23 bags.

**How many bags of concrete do i need for a 4×4 slab at 3 inches thick**

At 3 inches thick, for a 4×4 slab, you would need either 7 80-Pound, 9 60-pound, 11 50-pound, or 14 40-pound bags of premixed concrete. If you measure in cubic yards or cubic feet, then 0.148 cubic yards or 4 cubic feet of concrete will be required.

**Let’s do calculation and proceeds following steps:**

● 3″ thickness in feet = 3/12 = 0.25′

● Volume of concrete in cubic feet = 4 × 4 × 0.25 = 4

● Volume of concrete in yards = 4 × 0.037 = 0.148 yards.

● No. of 80lb bags = 4/0.60 = 7 bags

● No. of 60lb bags = 4/0.45 = 9 bags

● No. of 50lb bags = 4/0.375 = 11 bags

● No. of 40lb bags = 4/0.30 = 14 bags.

**How many bags of concrete do i need for a 4×4 slab at 6 inches thick**

At 6 inches thick, for a 4×4 slab, you would need either 14 80-Pound, 18 60-pound, 22 50-pound, or 27 40-pound bags of premixed concrete. If you measure in cubic yards or cubic feet, then 0.296 cubic yards or 8 cubic feet of concrete will be required.

**Let’s do calculation and proceeds following steps:**

● 6″ thickness in feet = 6/12 = 0.5′

● Volume of concrete in cubic feet = 4 × 4 × 0.5 = 8

● Volume of concrete in yards = 8 × 0.037 = 0.296 yards.

● No. of 80lb bags = 8/0.60 = 14 bags

● No. of 60lb bags = 8/0.45 = 18 bags

● No. of 50lb bags = 8/0.375 = 22 bags

● No. of 40lb bags = 8/0.30 = 27 bags.

**How many bags of concrete do i need for a 4×4 slab at 2 inches thick**

At 2 inches thick, for a 4×4 slab, you would need either 5 80-Pound, 6 60-pound, 8 50-pound, or 9 40-pound bags of premixed concrete. If you measure in cubic yards or cubic feet, then 0.0983 cubic yards or 2.656 cubic feet of concrete will be required.

**Let’s do calculation and proceeds following steps:**

● 2″ thickness in feet = 2/12 = 0.166′

● Volume of concrete in cubic feet = 4 × 4 × 0.166 = 2.656

● Volume of concrete in yards = 2.656 × 0.037 = 0.0983 yards.

● No. of 80lb bags = 2.656/0.60 = 5 bags

● No. of 60lb bags = 2.656/0.45 = 6 bags

● No. of 50lb bags = 2.656/0.375 = 8 bags

● No. of 40lb bags = 2.656/0.30 = 9 bags.

**Conclusion:**

At 4 inches thick, for a 4×4 slab you would need 0.196 yards or 5.28 cubic feet or either 9- 80lb, 12-60lb, or 18- 40lb bags of concrete.

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**Conclusions:**

At 4 inches thick, for a 4×4 slab, you would need either 9 80-Pound, 12 60-pound, 15 50-pound, or 18 40-pound bags of premixed concrete. If you measure in cubic yards or cubic feet, then 0.196 cubic yards or 5.28 cubic feet of concrete will be required.