To calculate how many bags of concrete you need for an 10×20 slab, you’ll first need to determine the thickness of the slab you want. Standard concrete slabs are typically 4 inches thick, but you may want a different thickness depending on your project.
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 bags of concrete do i need for a 10×20 slab
The amount of concrete you need for a 10×20 slab depends on how thick it will be. So, for a 4-inch slab you’ll need 2.47 cubic yards (112 80lb bags), a 5-inch slab requires 3.08 cubic yards (139 80lb bags) and a 6-inch slab requires 3.7 cubic yards (167 80lb bags).
How many bags of concrete do i need for a 10×20 slab at 3 inches thick
At 3 inches thick, for a 10×20 slab you would need approximately either 84 80-Pound, 112 60-pound, or 167 40-pound bags of premixed concrete. If you measure in yards, 1.85 cubic yards (or 50 cubic feet) of concrete will be required.
Let’s do calculation and proceeds following steps:
1. Convert 3″ thickness in feet = 3/12 = 0.25′
2. Volume of concrete in cubic feet = 10 × 20 × 0.25 = 50 cubic feet
3. Volume of concrete in yards = 50 × 0.037 = 1.85 cubic yards.
4. Estimate No. of 80lb bags = 50/0.60 = 84 bags
5. Estimate No. of 60lb bags = 50/0.45 = 112 bags
6. Estimate No. of 40lb bags = 50/0.30 = 167 bags.
How many bags of concrete do i need for a 10×20 slab at 4 inches thick
At 4 inches thick, for a 10×20 slab you would need approximately either 112 80-Pound, 149 60-pound, or 223 40-pound bags of premixed concrete. If you measure in yards, 2.47 cubic yards (or 66.67 cubic feet) of concrete will be required.
Let’s do calculation and proceeds following steps:
1. Convert 4″ thickness in feet = 4/12 = 0.333′
2. Volume of concrete in cubic feet = 10 × 20 × 0.333 = 66.67 cubic feet
3. Volume of concrete in yards = 66.67 × 0.037 = 2.47 cubic yards.
4. Estimate No. of 80lb bags = 66.67/0.60 = 112 bags
5. Estimate No. of 60lb bags = 66.67/0.45 = 149 bags
6. Estimate No. of 40lb bags = 66.67/0.30 = 223 bags.
How many bags of concrete do i need for a 10×20 slab at 5 inches thick
At 5 inches thick, for a 10×20 slab you would need approximately either 139 80-Pound, 186 60-pound, or 278 40-pound bags of premixed concrete. If you measure in yards, 2.22 cubic yards (60 cubic feet) of concrete will be required.
Let’s do calculation and proceeds following steps:
1. Convert 5″ thickness in feet = 5/12 = 0.417′
2. Volume of concrete in cubic feet = 10 × 20 × 0.417 = 83.33 cubic feet
3. Volume of concrete in yards = 83.33 × 0.037 = 3.08 cubic yards.
4. Estimate No. of 80lb bags = 83.33/0.60 = 139 bags
5. Estimate No. of 60lb bags = 83.33/0.45 = 186 bags
6. Estimate No. of 40lb bags = 83.33/0.30 = 278 bags.
How many bags of concrete do i need for a 10×20 slab at 6 inches thick
At 6 inches thick, for a 10×20 slab you would need approximately either 167 80-Pound, 223 60-pound, or 334 40-pound bags of premixed concrete. If you measure in yards, 3.7 cubic yards (or 100 cubic feet) of concrete will be required.
Let’s do calculation and proceeds following steps:
1. Convert 6″ thickness in feet = 6/12 = 0.5′
2. Volume of concrete in cubic feet = 10 × 20 × 0.5 = 100 cubic feet
3. Volume of concrete in yards = 100 × 0.037 = 3.7 cubic yards.
4. Estimate No. of 80lb bags = 100/0.60 = 167 bags
5. Estimate No. of 60lb bags = 100/0.45 = 223 bags
6. Estimate No. of 40lb bags = 100/0.30 = 334 bags.
Here’s are table for how much concrete do i need for a 10×20 slab:
| SL.no. | Thickness | Amount in Cubic feet | Amount in Cubic Yards | #80 lb | #60 lb |
| 1 | 3″ | 50 | 1.85 | 84 | 112 |
| 2 | 4″ | 66.67 | 2.47 | 112 | 149 |
| 3 | 5″ | 83.33 | 3.08 | 139 | 186 |
| 4 | 6″ | 100 | 3.7 | 167 | 223 |
Cost estimate for a 10×20 slab
The cost of a 10×20 slab can vary based on factors like location, materials used, and labour costs. On average, you might expect to pay between $4 and $8 per square foot for a basic 4″ to 8″ thick concrete slab. Therefore, a 10’x20′ slab could cost roughly between $800 to $1,600, excluding additional expenses like site preparation or finishing touches.
How much does a 10’×20’×4″ concrete slab cost?
A 4″ thick slab will cost an average cost of $4 per square foot. So, based on the national average, a 10’×20’×4″ concrete slab may cost about $800 (since 200 times $4 = $800).
How much does a 10’×20’×5″ concrete slab cost?
A 5″ thick slab will cost an average cost of $5 per square foot. So, based on the national average, a 10’×20’×5″ concrete slab may cost about $1,000 (since 200 times $5 = $1,000).
How much does a 10’×20’×6″ concrete slab cost?
A 6″ thick slab will cost an average cost of $6 per square foot. So, based on the national average, a 10’×20’×6″ concrete slab may cost about $1,200 (since 200 times $6 = $1,200).
How much does a 10’×20’×8″ concrete slab cost?
A 8″ thick slab will cost an average cost of $8 per square foot. So, based on the national average, a 10’×20’×8″ concrete slab may cost about $1,600 (since 200 times $8 = $1,600).
Conclusions:
If you have a 10×20 slab with 4″ thick, you’ll need approximately either 112- 80lb, or 149- 60lb (2.47 yards, or 66.67 cubic feet) bags of premixed concrete which will cost an average of $800 including labour.