How many bags of concrete for 8x8 slab

In US, dry ready mix concrete are packed in different bag size and weight in pounds such as smaller bag of 40lb (pounds) and 50lb (pounds), medium are of 60lb (pounds) bag, and larger are of 80lb and 90lb bag. If you want to install 5×4 concrete slab, first thing is to know about depth of slab and square footage of slab. Regardless of premixed ...

These simple-to-use calculators estimate how much concrete you'll need for concrete slabs, walls, square footings, round footings or columns and for post holes. ... Number of Pre-Mixed Concrete Bags Needed: 40 pound bags: 50 pound bags: 60 pound bags: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.Normal range: $3,600 - $7,200. Pouring a concrete slab averages around $5,400, and most slabs cost between $3,600 and $7,200, depending on square footage, thickness, and some other factors. C hances are, you've given very little thought about concrete slabs.So, for a 4-inch slab you'll need 3.16 cubic yards, or 85.33 cubic feet (143 80lb bags), a 3-inch slab requires 2.37 cubic yards, or 64 cubic feet (107 80lb bags), but a 2-inch slab requires 1.58 cubic yards, or 42.67 cubic feet (72 80lb bags). How many bags of concrete do i need for a 16×16 slab at 2 inches thickHow many bags of cement required for slab construction . ... The above explained concepts are related to the number of cement bags calculation for M25 grade concrete mix with various areas of the slabs for 8.5344 meters X 17.6784 meters slab it is required approximately 420 bags, for 49 meters X 30.5 meters slab it is required approximately ...

Pre-Mix Concrete Bag Calculator Calculated at 2160 kg per 1m³ - Allow extra for waste. Cubic Metres. 20 kg Bags 25 kg Bags 30 kg Bags 40 kg Bags. @ $ per bag. 1 Cubic Mteres = approx: 108 x 20 kg Bags. Bags. 20 kg Bags 25 kg Bags 30 kg Bags 40 kg Bags. @ $ per bag. 10 x 20 kg Bags = approx: 0.09 m³.0.444 cubic yards (12 ft 3) Concrete needed. 0.80 tons (1,596 lbs) Concrete needed (bags) 19.95 bags of 80 lbs each, or 26.59 bags of 60 lbs each, or 39.89 bags of 40 lbs each. get code. Quick navigation: Essential concrete basics for using a concrete calculator. Calculating how much concrete you need.How many concrete bags would I need for a 8 ft x 12 ft x 6" slab? 80 x 80lb Concrete bags. How much does it cost to pour a 8'x12' x6" slab? Ready-mix costs approx $331.79. How much does it cost to hire a contractor to concrete a 8'x12' x6" slab? A pro costs between $480.00 and $1,008.00. How do you calculate concrete volume?Here's how the calculation works: Volume = 0.25 x 3.142 x (2 x 2) x 0.2. Volume = 0.6284m3. General Concrete Density = 2400 kg/m3. If we multiply the 0.6284m 3 volume figure by the 2400 kg/m 3 density figure, we find that the total weight of concrete needed for the round slab is 1,508.16 kg or 3,324.99 lbs.Concrete Calculator. Concrete Calculator. Use our concrete calculator to get a rough estimate of how much concrete you may need for a job. Select the type of work you are performing and insert the dimensions, or request a quote from our experienced concrete estimators.

How many bags of concrete do i need for a 10×10 slab at 6 inches thick. To calculate the number of bags of concrete needed for a 10×10 slab at 6 inches thick, we must first determine the volume of concrete required. The volume of the slab can be calculated by multiplying the length (10 feet) by the width (10 feet) and the thickness (6 inches ...With a brief look, a 12x24 area at 6 inches deep, you would need approximately 7.57 tons or 5.33 cubic yards of gravel. Concrete reinforcing is also recommended in high traffic areas and medium to large areas. Wire mesh on average costs $0.56 per sq ft and fiber mesh costs $0.13 per sq ft. So for your 288 sq ft area, this may roughly cost $161. ...Fast Way To Lay A Concrete SlabFast Way to Pour a Concrete SlabFastest Possible Way to Pour ConcreteFast Small Concrete SlabHow to Make a Concrete PadHow to ...Choose Round Column (or Round Slab) on the calculator. Enter Height 4 ft (or 48 in) Enter Diameter 10 in. Calculate and the answer is 0.08 cubic yards for one concrete tube. Multiply 0.08 x 50 = 4 total cubic yards of concrete for 50 tubes. Note that this calculation is the volume of your tubes only and does not account for any overflow or loss ...1 cubic yard = 27 cubic feet. With this formula in mind, you'll be able to calculate just how much concrete or cement you'll need for your project: One 60-lb bag of concrete gives you .45 cubic feet of concrete when mixed with 2.5 quarts of water. In order to have enough concrete for one cubic foot, you'll require 2.2 bags of 60-lb concrete.The following chart will help you gain an idea of how many bags of premixed concrete you'll need to purchase for laying 4" and 6" slabs. Other projects may require different calculations, but this is a good point of reference for determining the amount needed. ... Slab 6" Thick: 60-lbs. Bags: 2: 3: 5: 7: 9: 15: 20: 35: 45: 50: 100: 80-lbs. Bags ...

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80lb is the most popular bag size of QuickCrete premixed concrete.. You will need 45 bags of concrete mix to make a cubic concrete yard.. And that 80-pound bag of 36.3 kg of substantial mix yields about 0.60 cubic feet (17 liters) of concrete.One cubic yard contains 27 cubic feet of concrete. If you divide 27 by .60, that equals 45 bags. One 80lb bag of the quick-rate concrete mix will yield ...Although the bulk of the hydration process takes place in the hours and days immediately after the pour, concrete needs 28 days to fully dry. While the slab will harden and lighten in color before ...At 4 inches thick, for a 5×10 slab you would need approximately either 28 80-Pound, 38 60-pound, or 56 40-pound bags of premixed concrete. If you measure in yards, 0.617 cubic yards (16.67 cubic feet) of concrete will be required. Let's do calculation and proceeds following steps:This concrete calculator can be used to estimate the volume of concrete needed for concrete slabs, walls, stairs, footings, columns, curbs, and gutters. You can also enter a custom concrete density and price. Search. ... Smaller projects might use concrete mix bags, which often come in sizes of 40 lbs, 60 lbs, and 80 lbs. Concrete would then be ...

A solid, unbroken slab of concrete weighs about two tons (or 4,000 pounds) per cubic yard. Breaking up concrete roughly halves the total weight per cubic yard to about one half ton (or about 2,000 pounds). How many bags of concrete are in a yard? To produce one yard of concrete, you’ll need to use about 45 80-pound bags (or 90 40-pound bags). You can use a concrete slab calculator to find the volume based on the dimensions of your slab. Input the bag size: Enter the size of the concrete mix bag in pounds (e.g., 60 or 80 pounds). Input the bag yield: Enter the yield of the concrete mix bag in cubic feet (e.g., 0.45 or 0.6 cubic feet).Step 1: Build the Concrete Slab Frame. Use 2-by-4 lumber to build a wood frame of the desired size and set it in place to mark the area. Drive landscaping stakes into the ground to mark the outside corners of the frame.Input the bag size: Enter the size of the concrete mix bag in pounds (e.g., 60 or 80 pounds). Input the bag yield: Enter the yield of the concrete mix bag in cubic … Use our free online Premix Concrete Calculator to calculate exactly how many premix concrete bags you should buy for your concrete project. Just enter in the desired height, width, and thickness of your concrete project and then press the calculate button. The free concrete calculator will tell you exactly how many 40 lb, 60 lb, or 80 lb bags ... How many bags of concrete do I need for a 10×10 slab. For your 10×10 slab, you'll need about 2.67 cubic yards of concrete. This equates to approximately 72 bags of 80-pound concrete. So roll up those sleeves and get ready to mix, because with 72 bags, you'll be slapping down some serious concrete goodness!MOST RECENT DRY POUR LINK HERE⬇️DRY POURING CONCRETE over EXISTING PATIO…What You Need To Knowhttps://youtu.be/i5PwQFQvbd8DRY POUR CONCRETE WALKWAY: 4 Inches...You can use our online concrete calculator to help you do the math. For example, a 4-inch-thick concrete patio measuring 12 feet long and 12 feet wide will require approximately 1.78 cubic yards of ready-mix concrete or 81 80-pound sacks of bagged mix. (Each 80-pound bag yields approximately 0.022 cubic yards of concrete.)Your standard concrete pad is normally a minimum of 4 inches in thickness with a reinforced wire mesh or rebar. Which cost on average .30 ... Quikrete — Calculate how many bags of cement you may need. Added on July 17, 2015; Lowes — Concrete Pad Calculator. Added on April 16, 2023;Normal range: $3,600 - $7,200. Pouring a concrete slab averages around $5,400, and most slabs cost between $3,600 and $7,200, depending on square footage, thickness, and some other factors. C hances are, you've given very little thought about concrete slabs.

Conclusions:-. At 4 inches thick, for a 6×6 board you typically need twenty-five 60-pound bags, nineteen 80-pound bags, or thirty-eight 40-pound bags, or 11.28 cubic feet or 0.44 cubic yards of premix concrete. Always buy 5-10% more ready-made mix than you need. How many bags of concrete do I need for a 3×6 slab.

blocks = wall sq ft block sq ft. If you're using a standard 8″ x 8″ x 16″ block, find the number of blocks needed by dividing the wall square footage by 0.89. blocks = wall sq ft 0.89. We recommend adding 5%-10% additional blocks to account for broken blocks or blocks that need to be cut for the edges.A concrete slab costs $6 to $12 per square foot on average installed, or $5,400 to $10,800 to pour a 30'x30' slab. Concrete materials cost $3 to $7 per square foot. Most concrete slabs are 4" to 6" thick and are used to build a garage floor, patio, or house foundation.Calculate the hole volume using 3 times the width of the post or 10.5″ or 0.88 feet: 0.88′ × 0.88′ × 2′ depth = 1.55 cubic feet. Subtract the post volume from the hole volume: 1.55 – 0.17 = 1.38 cubic feet per post hole. Multiply times the total number of posts: 1.38 × 20 posts = 27.6 cubic feet. Add 10% for waste = 30.36 cubic feet.Conclusions :-. For a 600 sq ft rcc roof slab casting at 4 inch thick, generally you will need 42 bags (around 2074 kg) of cement which is approximately equal as 50.83 in cubic feet or in 1.44 cubic meter by using 1:2:3 (cement: sand: aggregate) mix to gain 3000 Psi compressive strength of concrete in 28 days.First, measure down to ground level from the high end of a slope line. Add 7 1 ⁄ 2 " to that distance (4" for the subbase material and 3 1 ⁄ 2 " for the concrete if you are using 2 × 4 forms). Mark the total distance on the story pole, measuring from one end. Remove soil from the site with a spade.Input your concrete slab's details and click the calculate button to estimate the number of cement bags, sand, gravel and man-hours needed for your project. Stay on budget and finish your project on time. Use remaining material calculators. *Slab Height: meter/s. *Slab Width: meter/s.How many concrete bags would I need for a 8 ft x 12 ft x 6" slab? 80 x 80lb Concrete bags. How much does it cost to pour a 8'x12' x6" slab? Ready-mix costs approx $331.79. How much does it cost to hire a contractor to concrete a 8'x12' x6" slab? A pro costs between $480.00 and $1,008.00. How do you calculate concrete volume?The Concrete by 60lb Bag calculator computes the number of 60 pound bags of concrete and water needed to mix a volume ( V) of concrete. INSTRUCTIONS: Choose units and enter the following: ( V ) Volume of Concrete Needed. 60 lb Bags (nB): The calculator returns the number of 60 lb bags needed and the gallons of water needed.Total Length 240 m. Includes 10% waste / lap. Exact Spacing. Length 600 mid 300. Width 600 mid 500. 40 x 6000 Lengths. $ (Enter Cost per Bar) Approx Weight 213.1 kg. Slab Volume 6 m³.

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Just as a reminder, it goes as follows: weight = volume × density. For clarity's sake, let's go through a quick example. Let's say we have 15 cubic meters of Portland concrete. The density of this type of concrete in kilograms per cubic meter is 2,300, so the calculation goes as follows: weight of concrete = 15 m³ × 2,300 kg/m³ = 34,500 kg.Calculate the volume you need in cubic yards. Multiply the length (10 ft.) by the width (10 ft.) by the depth (.35 ft., or 4 in.) and divide it by 27 (the number of cubic feet in a cubic yard). You get 1.3 cu. yds. Then add 10 percent to allow for spillage and slab depth variations to help determine the concrete cost per yard.How to calculate concrete for 80lb bagsHow many concrete bags would I need for a 18 ft x 24 ft x 6" slab? 359 x 80lb Concrete bags. How much does it cost to pour a 18'x24' x6" slab? Ready-mix costs approx $899.76. How much does it cost to hire a contractor to concrete a 18'x24' x6" slab? A pro costs between $2,160.00 and $4,536.00. How do you calculate concrete volume?A: Quikrete Concrete Mix 60 lb. is designed for pouring concrete 2 in thick or more and building or repairing anything out of concrete. We do not suggest mixing it with sand and pouring it between patio stones. For more detailed product selection please give Quikrete Customer Support a call (800)-282-5828. by.A solid, unbroken slab of concrete weighs about two tons (or 4,000 pounds) per cubic yard. Breaking up concrete roughly halves the total weight per cubic yard to about one half ton (or about 2,000 pounds). How many bags of concrete are in a yard? To produce one yard of concrete, you’ll need to use about 45 80-pound bags (or 90 40-pound bags).The amount of concrete you need for a 3×5 slab depends on how thick it will be. So, for a 4-inch slab you’ll need 0.185 cubic yards, or 5 cubic feet (9 80lb bags), a 3-inch slab requires 0.139 cubic yards, or 3.75 cubic feet (7 80lb bags), but a 2-inch slab requires 0.208 cubic yards, or 2.5 cubic feet (5 80lb bags).At a minimum, you need a cement truck to deliver the concrete if you plan to DIY. 8x10 slab, 10" deep is 111 80lb bags of concrete. And that only gets you to the ground, if you go another 6 inches below ground thats 177 bags. You can't get all the concrete mixed and in the form with a small mixer. ….

How many concrete bags would I need for a 15 ft x 8 ft x 6" slab? 100 x 80lb Concrete bags. How much does it cost to pour a 15'x8' x6" slab? Ready-mix costs approx $373.09. How much does it cost to hire a contractor to concrete a 15'x8' x6" slab? A pro costs between $600.00 and $1,260.00. How do you calculate concrete volume?Using a concrete calculator is an easy and efficient way to determine how many bags of concrete you need for your project. The calculator takes into account the size of your project and the thickness of the concrete to give you an accurate estimate of the amount of concrete you'll need. By using a concrete calculator, you can save yourself ...Just divide the total weight needed by the weight in each bag. Example: The coop slab needs 6,666 pounds of dry concrete. You found a good price on palletized 80-pound bags of fast-mix concrete. Dividing 6,666 by 80 produces the rounded up number of 84. So, for the slab, you need 84 bags (or two pallets) of 80-pound concrete.The average cost of a concrete slab is $8 per square foot for materials and labor with most paying between $6 on the low end to $14 per square foot on the high end. ... Quikrete — Calculate how many bags of cement you may need. Added on July 17, 2015; Lowes — Concrete Pad Calculator. Added on April 16, 2023;How much concrete do I need for an area of 8 ft x 12 ft x 6" depth? 1.778 cu. yds. How many concrete bags would I need for a 8 ft x 12 ft x 6" slab? 80 x 80lb Concrete bags. How much does it cost to pour a 8'x12' x6" slab? Ready-mix costs approx $331.79.Oct 7, 2023 · Choose Round Column (or Round Slab) on the calculator. Enter Height 4 ft (or 48 in) Enter Diameter 10 in. Calculate and the answer is 0.08 cubic yards for one concrete tube. Multiply 0.08 x 50 = 4 total cubic yards of concrete for 50 tubes. Note that this calculation is the volume of your tubes only and does not account for any overflow or loss ... 1 cubic yard = 27 cubic feet. With this formula in mind, you'll be able to calculate just how much concrete or cement you'll need for your project: One 60-lb bag of concrete gives you .45 cubic feet of concrete when mixed with 2.5 quarts of water. In order to have enough concrete for one cubic foot, you'll require 2.2 bags of 60-lb concrete.You can use a concrete slab calculator to find the volume based on the dimensions of your slab. Input the bag size: Enter the size of the concrete mix bag in pounds (e.g., 60 or 80 pounds). Input the bag yield: Enter the yield of the concrete mix bag in cubic feet (e.g., 0.45 or 0.6 cubic feet). Calculate the number of bags: Click the ...With a brief look, a 12x22 area at 6 inches deep, you would need approximately 6.94 tons or 4.89 cubic yards of gravel. Concrete reinforcing is also recommended in high traffic areas and medium to large areas. Wire mesh on average costs $0.56 per sq ft and fiber mesh costs $0.13 per sq ft. So for your 264 sq ft area, this may roughly cost $147. ... How many bags of concrete for 8x8 slab, These simple-to-use calculators estimate how much concrete you'll need for concrete slabs, walls, square footings, round footings or columns and for post holes. ... Number of Pre-Mixed Concrete Bags Needed: 40 pound bags: 50 pound bags: 60 pound bags:, In this video I show from start to finish how to prep , form and pour a 6" thick concrete slab thats reinforced with 1/2" rebar. Video Shortcuts:@0:45 Prep w..., How many concrete bags would I need for a 8 ft x 15 ft x 6" slab? 100 x 80lb Concrete bags. How much does it cost to pour a 8'x15' x6" slab? Ready-mix costs approx $373.09. How much does it cost to hire a contractor to concrete a 8'x15' x6" slab? A pro costs between $600.00 and $1,260.00. How do you calculate concrete volume? , Apr 25, 2023 · For example, if one 80-pound bag of concrete mix yields 0.6 cubic feet, you can calculate the number of bags required by first converting the volume in cubic yards to cubic feet (1 cubic yard = 27 cubic feet) and then dividing the total cubic feet by the yield per bag. , At 6 inches thick, for a 10×12 slab you would need approximately either 100 80-Pound, 134 60-pound, or 200 40-pound bags of premixed concrete. If you measure in yards, 2.22 cubic yards (or 60 cubic feet) of concrete will be required. Let's do calculation and proceeds following steps: 1., How many concrete bags would I need for a 18 ft x 30 ft x 6" slab? 449 x 80lb Concrete bags. How much does it cost to pour a 18'x30' x6" slab? Ready-mix costs approx $1,252.20. How much does it cost to hire a contractor to concrete a 18'x30' x6" slab? A pro costs between $2,700.00 and $5,670.00. How do you calculate concrete volume?, For a 500 sq ft rcc roof slab casting at 4 inch thick, generally you will need 35 bags (around 1730 kg) of cement which is approximately equal as 42.34 in cubic feet or in 1.20 cubic meter by using 1:2:3 (cement: sand: aggregate) mix to gain 3000 Psi compressive strength of concrete in 28 days. Thus 35 bags of cement are required for 500 sq ft ..., How many yards of concrete do i need for a 30×40 slab at 5″ thick. You will need approximately 18.49 cubic yards or 499 cubic feet of ready mix concrete for a 30’×40′ slab at 5 inches thick. Maths calculation:- 1) 30×20 = 1200 square footage, 2) 5÷12 = 0.416 feet, 3) 1200 ×0.416 = 499 cubic feet, and 4) 499× 0.037 = 18.49 cubic yards., The volume of an 60lb bag of concrete is approximately 0.45 ft 3. This calculator computes the volume of the slab in cubic feet and then divides by the cubic feet in an 60lb bag. nb = L⋅ W ⋅ D 0.45f t3 n b = L ⋅ W ⋅ D 0.45 f t 3. where: nb = number of 60lb bags. L = length of slab., With a brief look, a 30x15 area at 6 inches deep, you would need approximately 11.83 tons or 8.33 cubic yards of gravel. Concrete reinforcing is also recommended in high traffic areas and medium to large areas. Wire mesh on average costs $0.56 per sq ft and fiber mesh costs $0.13 per sq ft. So for your 450 sq ft area, this may roughly cost $252 ..., How much concrete do I need for an area of 7 ft x 7 ft x 6" depth? 0.907 cu. yds. How many concrete bags would I need for a 7 ft x 7 ft x 6" slab? 40.7 x 80lb Concrete bags. How much does it cost to pour a 7'x7' x6" slab? Ready-mix costs approx $252.90. How much does it cost to hire a contractor to concrete a 7'x7' x6" slab?, For a 4×4 slab, we can repeat the calculation above with the new measurements: 4 x 4 x 0.1 (assuming a depth of 10cm) = 1.6m3. One cubic metre requires approximately 110 x 20kg Concrete Mix bags. Therefore, you will need 176 bags of concrete (1.6 x 110)., How many 80 lb bags of concrete to pour a 4ft by 4ft by 5 inch thick? Updated: 8/20/2019. Wiki User. ∙ 11y ago. Add an answer. Want this question answered? Be notified when an answer is posted., To calculate your concrete needs multiply the length by the width of your shed, then multiply by the thickness; remembering to change inches to feet (4” ÷ 12” = 0.33 ft). There are 27 cubic feet in a cubic yard of concrete, …, Here is how to calculate the required number of bags: First, you need to calculate the volume of the post hole. Volume = 1.96344 cubic feet or 0.07271 cubic yards. The second step is to divide the volume by the yield. For example, for a 60lb bag, 0.07271 / 0.01648 = 4.412, rounding up to 5 60lb bags., Step 4: Calculate the number of bags needed. Once you have determined the volume of concrete needed, you can now proceed to calculate the number of bags. One 80-pound bag of concrete can cover approximately 0.6 cubic feet of concrete. So, divide the volume of concrete by 0.6, and you will get the number of bags needed., At a minimum, you need a cement truck to deliver the concrete if you plan to DIY. 8x10 slab, 10" deep is 111 80lb bags of concrete. And that only gets you to the ground, if you go another 6 inches below ground thats 177 bags. You can't get all the concrete mixed and in the form with a small mixer., How to calculate concrete for 80lb bags, Input your concrete slab's details and click the calculate button to estimate the number of cement bags, sand, gravel and man-hours needed for your project. Stay on budget and finish your project on time. Use remaining material calculators. *Slab Height: meter/s. *Slab Width: meter/s., A 10 x 10 slab that's 5 inches thick needs 1.6 cubic yards or (72) 80lb bags of concrete. A 10 x 10 slab that's 6 inches thick needs 1.85 cubic yards or (84) 80lb bags of concrete. A 10 x 10 slab that's 7 inches thick needs 2.2 cubic yards or (99) 80lb bags of concrete., Apr 26, 2024 · Input the weight of one bag of premixed concrete - again, check the bag. Account for waste and spillage (usually 5-10%) and voila! Now you know how many bags you truly need. If you prefer to mix your own concrete, you have to know the mix ratio that you want to follow. Concrete mix ratios determine the strength of the resulting concrete. , A Practical Example. To get a better idea of how valuable a concrete calculator can be, let's try a real-world example and build a deck. This deck will require 12 footings. Each footing will be 12 inches across and two feet deep to get below the frost line. A rough estimate might say 24, 60-lb. bags of concrete., We would like to show you a description here but the site won't allow us., How much concrete do I need for a 6×8 slab. As per general practices, generally you will need approximately 0.59 cubic yards or 15.84 cubic feet or 0.45m3 (either 35 bags of 60lb or 27 bags of 80lb) of premixed concrete for a 6×8 slab at 4 inches thick, and, at 3 inches thick, for a 6×8 slab, either 26 bags of 60lb, or 20 bags of 80lb, or 40 ..., Wait for dry, warm conditions to pour your concrete slab. For most ready-mixes, the temperature should be 70 degrees Fahrenheit or higher for five days after pouring. You can pour the slab in colder temperatures, down to 50 degrees Fahrenheit, but extend the curing time to seven days., The block fill estimator calculates the volume of fill needed for a specified number of concrete blocks. To use this calculator, enter the total number of blocks in the project that was estimated previously, and select the width of the block used (6", 8" or 12"). The calculator will then return the estimated volume of fill in cubic yards., If you buy your concrete in 80lbs bags, it will take about 45 bags to equal 1 cubic yard. So, the calculation for an example project with ten 16” (8” radius) piers poured to a depth of 36” would look like this: 10×8” 2 x36” /14850 = 1.55 cubic yards (or 70 bags of 80lbs concrete mix), We would like to show you a description here but the site won't allow us., If you buy your concrete in 80lbs bags, it will take about 45 bags to equal 1 cubic yard. So, the calculation for an example project with ten 16" (8" radius) piers poured to a depth of 36" would look like this: 10×8" 2 x36" /14850 = 1.55 cubic yards (or 70 bags of 80lbs concrete mix), The average cost of a concrete slab (6 inches thick) is $5.00-5.50 per square foot, including materials and labor. However, the price can go up to $9-10 per square foot depending on numerous factors and enhancement costs. Thus, your cost to pave a 2-car driveway of 16 feet wide, and 40 feet long (640 sq.ft.) will be about $3,200 - 3,520., Therefore you will need 2.442 cubic yards of concrete for 10'× 20′ slab of 4 inch thick. How many bags of concrete do i need for a 10'× 20′ slab? As we know 40 pounds a bag of concrete yields 0.011 cubic yards, 60 pounds a bag of concrete yields 0.017 cubic yards and 80 pounds a bag of concrete yields 0.022 cubic yards., To construct a 10×10 slab of concrete with a minimum depth of 4-inches, you will need the following number of bags depending on the weight of the mix: 90 pounds: 50 bags. 80 pounds: 56 bags. 60 pounds: 75 bags. 50 pounds: 88 bags., As per general practices, generally you will need approximately 3.13 cubic yards or 84.48 cubic feet or 2.4m3 of ready mix concrete for a 16×16 slab at 4 inches thick. At 5 inches thick, for a 16'×16′ slab, 3.94 cubic yards or 106.5 cubic feet or 3m3 of ready mix concrete are required, while at 6 inches thick, 4.7 cubic yards or 128 cubic ...