How much concrete do I need – calculate concrete quantity, in this we article explain about concrete quantity calculation in slab of various size like 10×10, 10×12, 10×15, 10×20, 11×11, 14×14, 20×40, 40×60, 25×40, 30×40, 30×50, 24×24×4, 24×24×6 and etc. in easy and simple calculation & also know about concrete quantity calculation in how many bags of concrete and how many yards of concrete do you need.

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

Regardless of size you need to calculate the volume of concrete in cubic yard before ordering the mixed concrete. Volume is calculated by multiplying length, width and depth of slab as length× width× depth, add [email protected]%, so total required concrete quantity is Volume + Extra 10%.

Generally standard thickness of slab is 4 inch thick in normal conditions, if slab have heavy traffic and heavy load, you should take depth 5 or 6 inch thick.

Weight of Ready mix concrete in dry condition is about 133 lbs per cubic foot, 3600 lbs per cubic yard, or 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 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 feer), so 1 cubic yard is equal to 27 cubic feet.

**How much concrete do I need for a 10×10 slab**

**How much concrete do i need**:- multiply the thickness, width and length to find the number of cubic foot or cubic yards or bags of concrete needed for your project. For example, how much concrete do i need for a 10×10 slab, 1) concrete quantity in cubic feet = 10’×10’×0.33′ = 33 cu ft, 2) concrete quantity in cubic yards = 33÷27 = 1.22 cu. yd, 3) No. of 80lb bags = 1.22 ÷ 0.022 = 56 or No. of 60lb bags = 1.22 ÷ 0.017 = 72 bags. Thus, at 4″ thick, for a 10×10 slab, you will need approximately 33 cubic feet, or 1.22 cubic yards, or either 72 bags of 60lb or 56 bags of 80lb concrete.

To determine the how much concrete do I need for a 10×10 (100 sq ft) slab solve in following steps:-

Step 1 :- calculate the volume in cubic feet:- We have given 10×10 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 = 10’×10’× 0.33′ = 33 cubic foot.

Step 2 :- converting cubic feet into cubic yard:- Now converting into cubic yard, you should divide it by 27, because 1 cubic yard = 27 cubic foot, so volume of concrete you needed for 10 × 10 slab 4 inch thick in cubic yard = 33/27 = 1.22.

Step 3 :- Add 10% extra :- considering extra 10% wastage during mixing and pouring, so 10% of 1.22 cubic yard =0.122, add 1.22 + 0.122 = 1.34 cubic yard.

How much concrete do I need for a 10×10 slab:- using 4 inch thick, 10×10 slab in normal load or standard condition for making sidewalks, curbs, steps, ramp, walkway and patio, Generally, 1.34 cubic yards or 36.18 cubic feet of concrete quantity are needed for a 10×10 slab.

How many yards of concrete do I need for a 10×10 slab:- using 4 inch thick, 10×10 slab in normal load or standard condition for making sidewalks, curbs, steps, ramp, walkway and patio, generally, 1.34 cubic yards or 36.18 cubic feet of concrete quantity are needed for a 10×10 slab.

How many bags of concrete do I need for a 10×10 slab:- for 10×10 slab of 4 inch thick, generally you need 54 bags of 90lb ready mix concrete, 61 bags of 80lb ready mix concrete, 79 bags of 60lb ready mix concrete or 122 bags of 40lb ready mix concrete.

**How much concrete do I need for a 10×12 slab**

To determine the how much concrete do I need for a 10×12 (120 sq ft) slab solve in following steps:-

Step 1 :- calculate the volume in cubic feet:- We have given 10×12 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 = 10’×12’× 0.33′ = 39.6 cubic foot.

Step 2 :- converting cubic feet into cubic yard:- Now converting into cubic yard, you should divide it by 27, because 1 cubic yard = 27 cubic foot, so volume of concrete you needed for 10×12 slab 4 inch thick in cubic yard = 39.6/27 = 1.46.

Step 3 :- Add 10% extra :- considering extra 10% wastage during mixing and pouring, so 10% of 1.46 cubic yard =0.146, add 1.46 + 0.146 = 1.60 cubic yard.

How much concrete do I need for a 10×12 slab:- using 4 inch thick, 10×12 slab in normal load or standard condition for making sidewalks, curbs, steps, ramp, walkway and patio, Generally, 1.60 cubic yards or 43.2 cubic feet of concrete quantity you will need for a 10×12 slab.

How many yards of concrete do I need for a 10×12 slab:- using 4 inch thick, 10×12 slab in normal load or standard condition for making sidewalks, curbs, steps, ramp, walkway and patio, generally, 1.60 cubic yards or 43.2 cubic feet of concrete quantity you will need for a 10×12 slab.

How many bags of concrete do I need for a 10×12 slab:- for 10×12 slab of 4 inch thick, generally you need 64 bags of 90lb ready mix concrete, 73 bags of 80lb ready mix concrete, 94 bags of 60lb ready mix concrete or 145 bags of 40lb ready mix concrete.

**How much concrete do I need for a 10×15 slab**

To determine the how much concrete do I need for a 10×15 (150 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 10’×15’× 0.33′ = 49.5 cubic foot, add extra 10% of 49.5 = 4.95, such as 49.5 + 4.95 = 54.45 cft, convert in cubic yard = 54.45/27 = 2.01 cubic yards, so you will need 2.01 cubic yards or 54.45 cubic feet concrete quantity for 10×15 slab.

How much concrete do I need for a 10×15 slab:- using 4 inch thick, 10×15 slab in normal load or standard condition, generally 2.01 cubic yards or 54.45 cubic feet of concrete quantity you will need for a 10×15 slab.

How many yards of concrete do I need for a 10×15 slab:- using 4 inch thick, 10×15 slab in normal load or standard condition, generally 2.01 cubic yards or 54.45 cubic feet of concrete quantity you will need for a 10×15 slab.

How many bags of concrete do I need for a 10×15 slab:- for 10×15 slab of 4 inch thick, generally you need 80 bags of 90lb ready mix concrete, 92 bags of 80lb ready mix concrete, 118 bags of 60lb ready mix concrete or 183 bags of 40lb ready mix concrete.

**How much concrete do I need for a 10×20 slab**

To determine the how much concrete do I need for a 10×20 (120 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 10’×20’× 0.33′ = 66 cubic foot, add extra 10% of 66 = 6.6, such as 66 + 6.6 = 72.6 cft, convert in cubic yard = 72.6/27 = 2.69 cubic yards, so you will need 2.69 cubic yards or 72.6 cubic feet concrete quantity for 10×20 slab.

How much concrete do I need for a 10×20 slab:- using 4 inch thick, 10×20 slab in normal load or standard condition, generally 2.69 cubic yards or 72.6 cubic feet of concrete quantity you will need for a 10×20 slab.

How many yards of concrete do I need for a 10×20 slab:- using 4 inch thick, 10×20 slab in normal load or standard condition, generally 2.69 cubic yards or 72.6 cubic feet of concrete quantity you will need for a 10×20 slab.

How many bags of concrete do I need for a 10×20 slab:- for 10×20 slab of 4 inch thick, generally you need 108 bags of 90lb ready mix concrete, 122 bags of 80lb ready mix concrete, 158 bags of 60lb ready mix concrete or 245 bags of 40lb ready mix concrete.

**How much concrete do I need for a 20×40 slab**

To determine the how much concrete do I need for a 20×40 (800 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 20’×40’× 0.33′ = 264 cubic foot, add extra 10% of 264 = 26.4, such as 264 + 26 = 290 cft, convert in cubic yard = 290/27 = 10.74 cubic yards, so you will need 10.74 cubic yards or 290 cubic feet concrete quantity for 20×40 slab.

How much concrete do I need for a 20×40 slab:- using 4 inch thick, 20×40 slab in normal load or standard condition, generally 10.74 cubic yards or 290 cubic feet of concrete quantity you will need for a 20×40 slab.

How many yards of concrete do I need for a 20×40 slab:- using 4 inch thick, 20×40 slab in normal load or standard condition, generally 10.74 cubic yards or 290 cubic feet of concrete quantity you will need for a 20×40 slab.

How many bags of concrete do I need for a 20×40 slab:- for 20×40 slab of 4 inch thick, generally you need 430 bags of 90lb ready mix concrete, 488 bags of 80lb ready mix concrete, 632 bags of 60lb ready mix concrete or 976 bags of 40lb ready mix concrete.

**How much concrete do I need for a 40×60 slab**

To determine the how much concrete do I need for a 40×60 (2400 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 40’×60’× 0.33′ = 792 cubic foot, add extra 10% of 792 = 79.2, such as 792 + 79 = 871 cft, convert in cubic yard = 871/27 = 32.26 cubic yards, so you will need 32.26 cubic yards or 871 cubic feet concrete quantity for 40×60 slab.

How much concrete do I need for a 40×60 slab:- using 4 inch thick, 40×60 slab in normal load or standard condition, generally 32.26 cubic yards or 871 cubic feet of concrete quantity you will need for a 40×60 slab.

How many yards of concrete do I need for a 40×60 slab:- using 4 inch thick, 40×60 slab in normal load or standard condition, generally 32.26 cubic yards or 871 cubic feet of concrete quantity you will need for a 40×60 slab.

How many bags of concrete do I need for a 40×60 slab:- for 40×60 slab of 4 inch thick, generally you need 1290 bags of 90lb ready mix concrete, 1466 bags of 80lb ready mix concrete, 1898 bags of 60lb ready mix concrete or 2932 bags of 40lb ready mix concrete.

**How much concrete do I need for a 40×60 slab**

To determine the how much concrete do I need for a 40×60 (2400 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 40’×60’× 0.33′ = 792 cubic foot, add extra 10% of 792 = 79.2, such as 792 + 79 = 871 cft, convert in cubic yard = 871/27 = 32.26 cubic yards, so you will need 32.26 cubic yards or 871 cubic feet concrete quantity for 40×60 slab.

How much concrete do I need for a 40×60 slab:- using 4 inch thick, 40×60 slab in normal load or standard condition, generally 32.26 cubic yards or 871 cubic feet of concrete quantity you will need for a 40×60 slab.

How many yards of concrete do I need for a 40×60 slab:- using 4 inch thick, 40×60 slab in normal load or standard condition, generally 32.26 cubic yards or 871 cubic feet of concrete quantity you will need for a 40×60 slab.

How many bags of concrete do I need for a 40×60 slab:- for 40×60 slab of 4 inch thick, generally you need 1290 bags of 90lb ready mix concrete, 1466 bags of 80lb ready mix concrete, 1898 bags of 60lb ready mix concrete or 2932 bags of 40lb ready mix concrete.

**How much concrete do I need for a 30×60 slab**

To determine the how much concrete do I need for a 30×60 (1800 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 30’×60’× 0.33′ = 594 cubic foot, add extra 10% of 594 = 59, such as 594 + 59 = 649 cft, convert in cubic yard = 649/27 = 24 cubic yards, so you will need 24 cubic yards or 649 cubic feet concrete quantity for 30×60 slab.

How much concrete do I need for a 30×60 slab:- using 4 inch thick, 30×60 slab in normal load or standard condition, generally 24 cubic yards or 649 cubic feet of concrete quantity you will need for a 30×60 slab.

How many yards of concrete do I need for a 30×60 slab:- using 4 inch thick, 30×60 slab in normal load or standard condition, generally 24 cubic yards or 649 cubic feet of concrete quantity you will need for a 30×60 slab.

How many bags of concrete do I need for a 30×60 slab:- for 30×60 slab of 4 inch thick, generally you need 962 bags of 90lb ready mix concrete, 1092 bags of 80lb ready mix concrete, 1414 bags of 60lb ready mix concrete or 2185 bags of 40lb ready mix concrete.

**How much concrete do I need for a 30×50 slab**

To determine the how much concrete do I need for a 30×50 (1500 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 30’×50’× 0.33′ = 495 cubic foot, add extra 10% of 495 = 50, such as 495 + 50 = 545 cft, convert in cubic yard = 545/27 = 20.18 cubic yards, so you will need 20.18 cubic yards or 545 cubic feet concrete quantity for 30×50 slab.

How much concrete do I need for a 30×50 slab:- using 4 inch thick, 30×50 slab in normal load or standard condition, generally 20.18 cubic yards or 545 cubic feet of concrete quantity you will need for a 30×50 slab.

How many yards of concrete do I need for a 30×50 slab:- using 4 inch thick, 30×50 slab in normal load or standard condition, generally 20.18 cubic yards or 545 cubic feet of concrete quantity you will need for a 30×50 slab.

How many bags of concrete do I need for a 30×50 slab:- for 30×50 slab of 4 inch thick, generally you need 808 bags of 90lb ready mix concrete, 918 bags of 80lb ready mix concrete, 1187 bags of 60lb ready mix concrete or 1835 bags of 40lb ready mix concrete.

**How much concrete do I need for a 30×40 slab**

To determine the how much concrete do I need for a 30×40 (1200 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 30’×40’× 0.33′ = 396 cubic foot, add extra 10% of 396 = 40, such as 396 + 40 = 436 cft, convert in cubic yard = 436/27 = 16.15 cubic yards, so you will need 16.15 cubic yards or 436 cubic feet concrete quantity for 30×40 slab.

How much concrete do I need for a 30×40 slab:- using 4 inch thick, 30×40 slab in normal load or standard condition, generally 16.15 cubic yards or 436 cubic feet of concrete quantity you will need for a 30×40 slab.

How many yards of concrete do I need for a 30×40 slab:- using 4 inch thick, 30×40 slab in normal load or standard condition, generally 16.15 cubic yards or 436 cubic feet of concrete quantity you will need for a 30×40 slab.

How many bags of concrete do I need for a 30×40 slab:- for 30×40 slab of 4 inch thick, generally you need 646 bags of 90lb ready mix concrete, 734 bags of 80lb ready mix concrete, 950 bags of 60lb ready mix concrete or 1468 bags of 40lb ready mix concrete.

**How much concrete do I need for a 25×40 slab**

To determine the how much concrete do I need for a 25×40 (1000 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 25’×40’× 0.33′ = 330 cubic foot, add extra 10% of 330 = 33, such as 330 + 33 = 363 cft, convert in cubic yard = 363/27 = 13.44 cubic yards, so you will need 13.44 cubic yards or 363 cubic feet concrete quantity for 25×40 slab.

How much concrete do I need for a 25×40 slab:- using 4 inch thick, 25×40 slab in normal load or standard condition, generally 13.44 cubic yards or 363 cubic feet of concrete quantity you will need for a 25×40 slab.

How many yards of concrete do I need for a 25×40 slab:- using 4 inch thick, 25×40 slab in normal load or standard condition, generally 13.44 cubic yards or 363 cubic feet of concrete quantity you will need for a 25×40 slab.

How many bags of concrete do I need for a 25×40 slab:- for 25×40 slab of 4 inch thick, generally you need 538 bags of 90lb ready mix concrete, 611 bags of 80lb ready mix concrete, 790 bags of 60lb ready mix concrete or 1222 bags of 40lb ready mix concrete.

**How much concrete do I need for a 20×30 slab**

To determine the how much concrete do I need for a 20×30 (600 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 20’×30’× 0.33′ = 198 cubic foot, add extra 10% of 198 = 20, such as 298 + 20 = 218 cft, convert in cubic yard = 218/27 = 8.07 cubic yards, so you will need 8.07 cubic yards or 218 cubic feet concrete quantity for 20×30 slab.

How much concrete do I need for a 20×30 slab:- using 4 inch thick, 20×30 slab in normal load or standard condition, generally 8.07 cubic yards or 218 cubic feet of concrete quantity you will need for a 20×30 slab.

How many yards of concrete do I need for a 20×30 slab:- using 4 inch thick, 20×30 slab in normal load or standard condition, generally 8.07 cubic yards or 218 cubic feet of concrete quantity you will need for a 20×30 slab.

How many bags of concrete do I need for a 20×30 slab:- for 20×30 slab of 4 inch thick, generally you need 323 bags of 90lb ready mix concrete, 367 bags of 80lb ready mix concrete, 475 bags of 60lb ready mix concrete or 734 bags of 40lb ready mix concrete.

**How much concrete do I need for a 20×25 slab**

To determine the how much concrete do I need for a 20×25 (500 sq ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 20’×25’× 0.33′ = 165 cubic foot, add extra 10% of 165 = 17, such as 165 + 27 = 182 cft, convert in cubic yard = 182/27 = 6.74 cubic yards, so you will need 6.74 cubic yards or 182 cubic feet concrete quantity for 20×25 slab.

How much concrete do I need for a 20×25 slab:- using 4 inch thick, 20×25 slab in normal load or standard condition, generally 6.74 cubic yards or 282 cubic feet of concrete quantity you will need for a 20×25 slab.

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How many yards of concrete do I need for a 20×25 slab:- using 4 inch thick, 20×25 slab in normal load or standard condition, generally 6.74 cubic yards or 182 cubic feet of concrete quantity you will need for a 20×25 slab.

How many bags of concrete do I need for a 20×25 slab:- for 20×25 slab of 4 inch thick, generally you need 270 bags of 90lb ready mix concrete, 306 bags of 80lb ready mix concrete, 397 bags of 60lb ready mix concrete or 613 bags of 40lb ready mix concrete.

**How much concrete do I need for a 24×24×4 slab**

To determine the how much concrete do I need for a 24×24×4 (1.32 cu ft) slab of 4″ thick, solve in following steps:- volume in cubic feet = 24″×24″× 0.33′ = 1.32 cubic foot, add extra 10% of 1.32 = 0.132, such as 1.32 + 0.132 = 1.452 cft, convert in cubic yard = 1.452/27 = 0.0537 cubic yards, so you will need 0.0537 cubic yards or 1.452 cubic feet concrete quantity for 24×24×4 slab.

How much concrete do I need for a 24×24×4 slab:- using 4 inch thick, 24×24 sq inch slab in normal load or standard condition, generally 0.0537 cubic yards or 1.452 cubic feet of concrete quantity you will need for a 24×24×4 slab.

How many yards of concrete do I need for a 24×24×4 slab:- using 4 inch thick, 24×24 slab in normal load or standard condition, generally 0.0537 cubic yards or 1.452 cubic feet of concrete quantity you will need for a 24×24×4 slab.

How many bags of concrete do I need for a 24×24×4 slab:- for 24×24 slab of 4 inch thick, generally you need 2.15 bags of 90lb ready mix concrete, 2.44 bags of 80lb ready mix concrete, 3.16 bags of 60lb ready mix concrete or 4.88 bags of 40lb ready mix concrete.

**How much concrete do I need for a 24×24×6 slab**

To determine the how much concrete do I need for a 24×24×6 (2 cu ft) slab of 6″ thick, solve in following steps:- volume in cubic feet = 24″×24″× 0.5′ = 2 cubic foot, add extra 10% of 2 = 0.2, such as 2 + 0.2 = 2.2 cft, convert in cubic yard = 2.2/27 = 0.0815 cubic yards, so you will need 0.0815 cubic yards or 2.2 cubic feet concrete quantity for 24×24×6 slab.

How much concrete do I need for a 24×24×6 slab:- using 6 inch thick, 24×24 sq inch slab in normal load or standard condition, generally 0.0815 cubic yards or 2.2 cubic feet of concrete quantity you will need for a 24×24×6 slab.

How many yards of concrete do I need for a 24×24×6 slab:- using 6 inch thick, 24×24 slab in normal load or standard condition, generally 0.0815 cubic yards or 2.2 cubic feet of concrete quantity you will need for a 24×24×6 slab.

**Conclusion**:-

To determine “how much concrete do i need”, multiply the thickness, width and length to find the number of cubic foot or cubic yards or bags of concrete needed for your project.