To calculate the number of cubic yards of concrete you need for a 24×30 slab, you first need to determine the thickness of the slab. Let’s assume a standard thickness of 4 inches (0.33 feet) for a residential concrete slab.

The formula to calculate the volume of concrete in cubic yards is: Volume = Length (in feet) x Width (in feet) x Thickness (in feet). Volume = 24 ft x 30 ft x 0.33 ft = 237.6 cubic feet. To convert cubic feet to cubic yards, divide by 27 (since 1 cubic yard = 27 cubic feet): 237.6 cubic feet ÷ 27 = 8.8 cubic yards.

Concrete is a blended mix of Portland cement, sand, aggregate, water with approve ingredient. Cement is acts as binder or adhesive materials to bind the components of concrete all together to create workable paste. Sand acts as filler material that fills the voids and gap between components of concrete and remove the air. Aggregate, stone, or gravel used to strengthen the concrete strength.

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.

**How many yards of concrete do i need for a 24×30 slab**

If you have a 24×30 slab, you would need approximately 8.89 yards (240 cubic feet, or either 400- 80lb, 534- 60lb bags) of concrete at 4″ thick, 11.11 yards (300 cubic feet, or either 500- 80lb, 667- 60lb bags) of concrete at 5″ thick, 13.33 yards (360 cubic feet, or either 600- 80lb, 800- 60lb bags) of concrete at 6″ thick, or 17.78 yards (480 cubic feet, or either 800- 80lb, 1067- 60lb bags) of concrete at 8″ thick.

**How many yards of concrete do i need for a 24×30 slab at 4 inches thick**

At 4 inches thick, for a 24×30 slab you would need approximately 8.89 cubic yards or 240 cubic feet of ready mix concrete. If you use premix concrete bag, either 400 80-Pound, or 534 60-pound bags of concrete will be required.

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

● 4″ thickness in feet = 4/12 = 0.333′

● Volume of concrete in cubic feet = 24 × 30 × 0.333 = 240

● Volume of concrete in yards = 240 × 0.037 = 8.89 yards.

● No. of 80lb bags = 240/0.60 = 400 bags

● No. of 60lb bags = 240/0.45 = 534 bags

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**How many bags of concrete do i need for a 24×30 slab at 5 inches thick**

At 5 inches thick, for a 24×30 slab you would need approximately 11.11 cubic yards or 300 cubic feet of ready-mix concrete. If you use premix concrete bag, either 500 80-Pound, or 667 60-pound bags of concrete will be required.

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

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

● Volume of concrete in cubic feet = 24 × 30 × 0.417 = 300

● Volume of concrete in yards = 300 × 0.037 = 11.11 yards.

● No. of 80lb bags = 300/0.60 = 500 bags

● No. of 60lb bags = 300/0.45 = 667 bags

**How many bags of concrete do i need for a 24×30 slab at 6 inches thick**

At 6 inches thick, for a 24×30 slab you would need approximately 13.33 cubic yards or 360 cubic feet of ready-mix concrete. If you use premix concrete bag, either 600 80-Pound, or 800 60-pound bags of concrete will be required.

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

● 3″ thickness in feet = 6/12 = 0.5′

● Volume of concrete in cubic feet = 24 × 30 × 0.5 = 360

● Volume of concrete in yards = 360 × 0.037 = 13.33 yards.

● No. of 80lb bags = 360/0.60 = 600 bags

● No. of 60lb bags = 360/0.45 = 800 bags

**How many bags of concrete do i need for a 24×30 slab at 8 inches thick**

At 8 inches thick, for a 24×30 slab you would need approximately 17.78 cubic yards or 480 cubic feet of ready-mix concrete. If you use premix concrete bag, either 800 80-Pound, or 1067 60-pound bags of premixed concrete will be required.

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

● 6″ thickness in feet = 8/12 = 0.666′

● Volume of concrete in cubic feet = 24 × 30 × 0.666 = 480

● Volume of concrete in yards = 480 × 0.037 = 17.78 yards.

● No. of 80lb bags = 480/0.60 = 800 bags

● No. of 60lb bags = 480/0.45 = 1067 bags.

**Cost estimate for a 24×30 slab**

For the most part, the typical concrete slab price range of $4 to $8 per square foot includes labor. A 24×30 slab is a 720 square foot. Using ready-mix concrete to cover 24×30 (720 sq ft) at a depth of 4″ to 6″-8″, the estimated cost is range between $2,880 to $5,760 (720× $4 = $2,880 or 720×$8 = $5,760).

**How much does a 24’×30’×4″ concrete slab cost?**

Pouring a concrete slab may cost between $4 and $8 per square foot. A 4″ thick slab will cost an average cost of $4 per square foot. Based on the national average, a 24’×30’×4″ (720 square feet) concrete slab may cost about $2,880 (720 times $4 = $2,880).

**How much does a 24’×30’×5″ concrete slab cost?**

Pouring a concrete slab may cost between $4 and $8 per square foot. A 5″ thick slab will cost an average cost of $5 per square foot. Based on the national average, a 24’×30’×5″ (720 square feet) concrete slab may cost about $3,600 (720 times $5 = $3,600).

**How much does a 24’×30’×6″ concrete slab cost?**

Pouring a concrete slab may cost between $4 and $8 per square foot. A 6″ thick slab will cost an average cost of $6 per square foot. Based on the national average, a 24’×30’×6″ (720 square feet) concrete slab may cost about $4,320 (720 times $6 = $4,320).

**How much does a 24’×30’×8″ concrete slab cost?**

Pouring a concrete slab may cost between $4 and $8 per square foot. A 8″ thick slab will cost an average cost of $8 per square foot. Based on the national average, a 24’×30’×8″ (720 square feet) concrete slab may cost about $5,760 (720 times $8 = $5,760).

**How many yards of concrete do I need for a 30×30×4 slab**

**How many yards of concrete do I need for a 40×30 slab**

**How many yards of concrete do I need for a 40×50 slab**

**How many yards of concrete do I need for a 40×80 slab**

**How many bags of concrete do I need for a 3×3 slab**

**Conclusions:**

If you have a 24×30 slab with 4″ thick, you would need approximately 8.89 cubic yards (240 cubic feet or either 400- 80lb, or 534- 60lb bags of concrete which will cost an average of $2,880 including labour.