How many bags of concrete for 8x8 slab

How many concrete bags would I need for a 32 ft x 32 ft x 6" slab? 851 x 80lb Concrete bags. How much does it cost to pour a 32'x32' x6" slab? Ready-mix costs approx $2,069.17. How much does it cost to hire a contractor to concrete a 32'x32' x6" slab? A pro costs between $5,120.00 and $10,752.00. How do you calculate concrete volume?

Sep 1, 2022 ... This calculation will help you determine the amount of concrete needed for a rectangular or square slab. ... We know that 1 x 20kg bag of cement ...Following are the formulas to calculate how much concrete you will require for a circular slab: 3.14 x r (feet) x r (feet) x T (inches) ÷ 12 = cubic feet of concrete (CF) Number of bags of concrete needed: CF ÷ 0.45 = number of 60 lb. bags CF ÷ 0.6 = number of 80 lb. bags Number of cubic yards of concrete needed:Nov 30, 2021 - how many bags of concrete do i need for a 10x10 slab? depends on the size of the slab whether it is a 10×10 slab or 10×12 etc and the size of the concrete dry mix bag you have ordered from the company.Nov 30, 2021 - how many bags of concrete do i need for a 10x10 slab? depends on the size of the slab whether it is a 10×10 slab or 10×12 etc and the size of the concrete dry mix bag you have ordered from the company.1 cubic foot = 1,728 cubic inches 1 cubic yard = 27 cubic feet. Find the area of the planned concrete slab by measuring the length and the width of the available space for the slab. Multiply these two measurements together (length x width). Determine the desired thickness of the slab. A 4-inch thickness is plenty for most applications.Circular, Slab or Tube. * Note that our Concrete Calculator uses the stats of premixed cement density, which is 2,130 kg/cubic meters, and 133 pounds/cubic feet in order to calculate the weight of concrete which is required. It's also important to note that the density of concrete will differ depending on the type of concrete you are using.Welcome to the concrete calculator. It will help you calculate the number of bags of concrete required for your path, slab or post holes. Please select your stateTake the hassle out of math and simplify your concrete planning with our best-in-class concrete slab calculator. With just 3 straightforward steps, you can quickly determine the exact amount of concrete required for your project. ... Select your unit type, cost type (by bag or by the yard/meter), bag size, cost and desired waste amount. Your ...

The concrete calculators on this page make it easy to measure the volume required for some of the most common applications: Slabs. Square columns. Curbs & gutters. Stairs. Tubes (e.g. footings, round columns, or piers) Commonly sold by the cubic yard for large construction projects, concrete mixes are also widely available in bags for smaller ...Cost per Bag. A concrete slab 36" X 36" at a depth of 4", has a volume of 3 ft³ = 10 x 40 # bags. 10 Bags. Total Bag Weight 400 lb. Calculated at 133.3 lb per ft³ - Allow extra for waste. Pre-Mix Concrete Bag Calculator Calculated at 133.3 lb per ft³ - Allow extra for waste. Cubic Feet.The concrete calculators on this page make it easy to measure the volume required for some of the most common applications: Slabs. Square columns. Curbs & gutters. Stairs. Tubes (e.g. footings, round columns, or piers) Commonly sold by the cubic yard for large construction projects, concrete mixes are also widely available in bags for smaller ...Use 10-by-10 welded wire mesh inside the area. Suspend the rebar and mesh above the rocks by placing pieces of scrap wood underneath them. Build the wooden forms for the outside of the concrete slab using your string marker as a guide. Nail pieces of 2-inch-by-10-inch lumber together. Hold the wood in place with stakes.How much concrete do I need for a 3×3 slab. As per general practices, generally you will need approximately 0.11 cubic yards or 2.97 cubic feet or 0.084m3 (either 7 bags of 60lb or 5 bags of 80lb) of premixed concrete for a 3×3 slab at 4 inches thick, and, at 3 inches thick, for a 3×3 slab, either 5 bags of 60lb, or 4 bags of 80lb, or 8 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.Let's calculate how many 80-pound bags of concrete you will need. Step 1: Measure dimensions - Length (10 feet), Width (8 feet), Depth (0.33 feet - since there are 12 inches in a foot, we divide 4 by 12) Step 2: Calculate volume - 10 x 8 x 0.33 = 26.4 cubic feet. Step 3: Convert to cubic yards - 26.4 / 27 = approx. 0.98 cubic yards.

How many bags of concrete do i need for a 4×8 slabHow many bags of concrete you will need depend on:- 1) thickness of slab and 2) weight of the bag.#hellosir...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 ...For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags. If we add an extra 10%, that's an extra 8 60-pound bags or 6 80-pound bags. Whatever the size of your project, use the formula above to calculate how much concrete you'll need!With a brief look, a 15x30 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 ...

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Concrete Slab Calculator for Slabs, Floors, Footings and Cylinders. This is a terrific concrete slab calculator for estimating how many cubic yards to order to complete your concrete slabs, concrete floors, concrete walls, and concrete footings. Just remember to add some extra concrete to your total order because running short is not an option.How many yards of concrete do i need for a 24×24×4 slab. How many bags of concrete do I need for a 3×5 slab at 4″ thick. As per general practices, generally you will need approximately either You will need approximately either Eleven (11) 60-lb, or Nine (9) 80-lb, or Seventeen (17) 40-lb bags of Quikrete's or Sakrete concrete mix (0.183 ...Then add the totals of the smaller shapes together to get the concrete needed for the entire slab. For example, you need a slab of concrete that is 12 feet wide, 10 feet long and 4 inches thick. The math is: 12 ft. x 10 ft. x (4 in./12 in. per ft.) ft. = 12 x 10 x .333 = 40 cubic feet.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 many concrete bags would I need for a 14 ft x 18 ft x 6" slab? 210 x 80lb Concrete bags. How much does it cost to pour a 14'x18' x6" slab? Ready-mix costs approx $595.13. How much does it cost to hire a contractor to concrete a 14'x18' x6" slab? A pro costs between $1,260.00 and $2,646.00. How do you calculate concrete volume? The surface of the concrete should be relatively flat and slightly above the form. Step 8 Screed the concrete using a straight 2x4 by moving the board back and forth across the surface of the concrete in a sawing motion to remove the excess concrete and smooth the surface. Step 9 Add concrete to any low areas and screed level. Step 10 As per general practices, generally you will need approximately 86 bags of 60lb (pounds) of premixed concrete for a 10×12 slab at 4 inches thick, 109 bags of 60lb at 5″ thick, 131 bags of 60lb at 6″ thick, 66 bags of 60lb at 3″ thick, and 44 bags of 60lb at 2″ thick. How much concrete do i need for a 16×20 slab.concrete block costs = price per block × number of blocks. When it comes to estimating the mortar needed, a good rule of thumb is that three standard bags will typically cover 100 blocks. To calculate the number of such bags, you need to divide the number of blocks by 33.3: mortar bags estimation = number of blocks needed / 33.3The solution to this is very simple. Simply enter your details into the above calculator to obtain an estimate. Concrete premix bags are available in the following sizes: 40lb, 60lb, and 80lb. Each bag size has a different volume. To fill one cubic yard of concrete, you will need 90 bags of 40lb size, 60 bags of 60lb size, and 45 bags of 80lb …How many bags of concrete do i need for a 3×6 slab at 2 inches thick. At 2 inches thick, for a 3×6 slab you would need approximately either 5 80-Pound, 7 60-pound, or 10 40-pound bags of premixed concrete. If you measure in yards, 0.11 cubic yards (or 3 cubic feet) of concrete will be required. Let’s do calculation and proceeds following ...How many concrete bags would I need for a 18 ft x 18 ft x 6" slab? 270 x 80lb Concrete bags. How much does it cost to pour a 18'x18' x6" slab? Ready-mix costs approx $717.32. How much does it cost to hire a contractor to concrete a 18'x18' x6" slab? A pro costs between $1,620.00 and $3,402.00. How do you calculate concrete volume?Weight =1/5.5× 1925 m3×1440 kg/m3. Weight of cement = 5040 Kg. 1 bag cement = 50kg. No. of bags of cement = 5040/50. Number of cement bags are required for 100m2 slab = 100.8 bags. 100.8 cement bags are required for a 100m2 slab. You Can Follow me on Facebook and Subscribe our Youtube Channel. You should also visits:-.

How much concrete do I need for an area of 8 ft x 8 ft x 6" depth? 1.185 cu. yds. How many concrete bags would I need for a 8 ft x 8 ft x 6" slab? 54 x 80lb Concrete bags. …

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 thickIf 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)How many bags of concrete do I need for a 10×20 slab at 5″ thick. As per general practices, generally you will need approximately either 177 bags of 60lb or 137 bags of 80lb, or 273 bags of 40lb (3 cubic yards or 83.2 cubic feet or 2.35 m3) of premixed concrete for a 10×20 slab at 5 inches thickSep 1, 2022 ... This calculation will help you determine the amount of concrete needed for a rectangular or square slab. ... We know that 1 x 20kg bag of cement ...For example, if your pouring a 10×12 concrete shed floor that’s 4 inches thick, you’ll need 40 cubic feet of concrete. That works out to 1.48 yards of concrete which is 67 premixed 80 lb. bags totaling 5360 pounds of dry concrete. More when it’s mixed with water. The cost averages around $6 per bag totaling just over $400 before tax.To calculate the volume of concrete: Volume = Length x Width x Height, Volume = 10 inches x 8 inches x 4 inches x 15 = 2.77778 cubic feet. Therefore, you will need approximately 2.77778 cubic feet of concrete for this rectangular slab. This is approximately: 3 (80-pound bags) or 4 (60-pound bags).The calculator will indicate the number of 50 lb. bags of QUIKRETE® Fast-Setting Concrete you need. Post Hole Calculator. Enter the Hole Depth in Inches. 2' Post Hole- 6" Hole Diameter. 4' Post Hole- 9" Hole Diameter. 6' Post Hole- 12" Hole Diameter. Products & Orders. (845) 221-2224.

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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.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.How many concrete bags would I need for a 12 ft x 18 ft x 6" slab? 180 x 80lb Concrete bags. How much does it cost to pour a 12'x18' x6" slab? Ready-mix costs approx $534.88. How much does it cost to hire a contractor to concrete a 12'x18' x6" slab? A pro costs between $1,080.00 and $2,268.00. How do you calculate concrete volume?Step 3: Add the Gravel Base. A solid gravel base helps prevent uneven settling and erosion underneath the slab. Pour 3-4 inches of QUIKRETE All-Purpose Gravel or crushed stone inside the form. Use a rake to evenly spread the gravel. Compact the gravel with a hand tamper before leveling it with the top of the form.The amount of ballast required for 1 cubic meter of concrete can vary depending on the specific mix design and desired concrete properties. Conclusion This ballast and cement calculator is a valuable tool that can help you accurately estimate the amount of materials needed for your construction project, allowing for better planning and budgeting.9 Pour the slab. Mix up the concrete in a wheelbarrow and pour it into place. Make sure you pour at least 40mm of concrete on top of the steel mesh. To remove any air holes from the fresh concrete, give each side of the box a few good taps with a hammer.How many 600×600 slabs in a square meter? To find the number of 600×600 slabs needed per square meter, divide the area of the space by the area of each individual slab. For example, if your area is 10 square meters, and each slab covers 0.36 square meters, you would need approximately 28 slabs (10 / 0.36 = 27.78).Concrete slab projects typically cost between $3,600 and $7,200, but homeowners will pay around $5,400 on average. Residential concrete slabs are useful for supporting the weight of cars, sheds ...With a brief look, a 24x8 area at 6 inches deep, you would need approximately 5.05 tons or 3.56 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 192 sq ft area, this may roughly cost $107. ... ….

How much concrete do I need for a 6×4 slab. As per general practices, generally you will need approximately 0.30 cubic yards or 7.92 cubic feet or 0.22m3 (either 18 bags of 60lb or 14 bags of 80lb) of premixed concrete for a 6×4 slab at 4 inches thick, and, at 3 inches thick, for a 6×4 slab, either 13 bags of 60lb, or 10 bags of 80lb, or 20 ...How much concrete do I need for an area of 30 ft x 40 ft x 6" depth? 22.222 cu. yds. How many concrete bags would I need for a 30 ft x 40 ft x 6" slab? 998 x 80lb Concrete bags. How much does it cost to pour a 30'x40' x6" slab? Ready-mix costs approx $2,537.49. How much does it cost to hire a contractor to concrete a 30'x40' x6" slab?To produce one yard of concrete, you'll need to use about 45 80-pound bags (or 90 40-pound bags). Because of the time and labor required to prepare such a large ...Quickly calculate concrete slab and footing pours by entering the depth, width and length to find the number of cubic yards or bags of concrete needed for your project. Give these calculations to your ready-mix supplier or use them to estimate how many 40, 60 or 80 lb. bags of concrete to buy. 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. 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 8×16 slab you will need 1.56 yards of concrete, so number of 80lb bag of concrete = 1.56 ÷ 0.022 = 71 bags, No. of 60lb bag = 1.56 ÷ 0.017 = 92 bags & No. of 40lb bag = 1.56 ÷ 0.011 = 142 bags.Please call us 0845 8726446. Whether you are building a small shed base or a large driveway this calculator will give you the the volume of hardcore and concrete required.With a brief look, a 16x16 area at 6 inches deep, you would need approximately 6.73 tons or 4.74 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 256 sq ft area, this may roughly cost $143. ... How many bags of concrete for 8x8 slab, How many 80 pound bags of concrete to pour a 8x8 slab 4 inches thick? U need 1.63 80lb bags per square ft so 131bags to do 8ft by 8ft., Using This Cement Volume Calculator. This calculator is based on 6 - 94 Lb. sacks of Portland Cement per cubic yard (3000psi). 27 cubic feet equals 1 cubic yard. Enter number of bags of Portland cement or fraction of bag. Example: One and half bag, Enter 1.5 Round off answer to next even higher figures. This calculator is intended for ..., As per general practices, generally you will need approximately 89 bags of 40lb (pounds) of premixed concrete for a 8×10 slab at 4 inches thick, 112 bags of 60lb at 5″ thick, 135 bags of 60lb at 6″ thick, 68 bags of 60lb at 3″ thick, and 45 bags of 60lb at 2″ thick. Conclusions:-., 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). ... To produce one yard of concrete, you’ll need to use about 45 80-pound bags (or 90 40-pound bags). Because of the time and labor ..., Step 4:- to determine how many bags of concrete you will need, divide the total cubic yardage by the one bag 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., 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 4×5 slab you will need 0.244 yards of concrete, so number of 80lb bag of concrete = 0.244 ÷ 0.022 = 11 bags, No. of 60lb bag = 0.244 ÷ 0.017 = 15 bags & No. of 40lb bag = 0.244 ÷ 0.011 = 22 bags., You will need 3 inches of gravel under a concrete slab that is 4 inches thick. More gravel is better, but 3 inches is the minimum amount of gravel you should have with a 4" slab. Use ¾" washed and screened gravel, then compact it to level., With a brief look, a 24x24 area at 6 inches deep, you would need approximately 15.15 tons or 10.67 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 576 sq ft area, this may roughly cost ..., Take the hassle out of math and simplify your concrete planning with our best-in-class concrete slab calculator. With just 3 straightforward steps, you can quickly determine the exact amount of concrete required for your project. Whether you have various dimensions or need to calculate for multiple slabs, our calculator is equipped to handle it ... , 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., So, for a ton (1000kg) of ballast, you would need approximately 166.67kg (1000 / 6) of cement. This is roughly equivalent to 6-7 bags of 25kg cement. How many bags of cement do I need for shed base? The number of bags of cement needed for a shed base depends on the size and thickness of the base., Divide the resulting number by 27 to find cubic yards. The volume of concrete required for a 10- by 10-foot slab depends on the diameter of the slab. For a 4-inch slab, either eight 60-pound or six 80-pound bags are required, while for a 6-inch slab, either 12 60-pound or nine 80-pound bags are necessary., Learn from a 39 year concrete flat work professional, how to install a concrete slab. I'll teach you my step-by-step formula for forming and pouring any size concrete slab. This diy video guide tutorial will easily show you the steps you need to take to successfully install your own concrete slab., The calculator will indicate the estimated number of 25 kg or 30 kg bags of Quikrete® Concrete Mix needed to build a 3″, 4″ or 6″ slab (with a typical waste factor). Yields are approximate and will vary based upon placement methods, equipment utilized and do not include allowance for uneven subgrade, waste, etc. ... 8" x 8' tube: 6.5: 5. ..., How Much Concrete Do I Need? Use our concrete calculator to determine how many bags of concrete are needed to get your simple slab of concrete built. Simply enter the width, length, and depth of the area. Then, depending on what size bags are available, you will know the amount needed for your project. Width (ft), Calculation Result. 0.009 cubic feet or 0.000 cubic yards or 0.000 cubic meters. if pre-mixed concrete*, it is 1.231 lbs or 0.558 kgs. if 60 lbs per bag, it is 0.021 bags. if 80 lbs per …, So, for a ton (1000kg) of ballast, you would need approximately 166.67kg (1000 / 6) of cement. This is roughly equivalent to 6-7 bags of 25kg cement. How many bags of cement do I need for shed base? The number of bags of cement needed for a shed base depends on the size and thickness of the base., Nov 23, 2022 · 30 MPa. $217/m 3. 35 MPa. $231/m 3. 40 MPa. $245/m 3. Source: Intercounty Concrete 2021 Price List. 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. , 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 ..., 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., 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!, A 10' x 10' concrete slab is equal to 100 square feet. @ 4" thick you'll need 1.25 yards of concrete ... You can use this measurement to figure out how many bags of concrete to use. If you divide 3.93 cubic feet by 27 (3.93/27) = .146 cubic yards. Dividing cubic feet by 27 (a cubic yard) will give you the concrete yardage. ..., 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., 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., 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 ..., For example, if your pouring a 10×12 concrete shed floor that’s 4 inches thick, you’ll need 40 cubic feet of concrete. That works out to 1.48 yards of concrete which is 67 premixed 80 lb. bags totaling 5360 pounds of dry concrete. More when it’s mixed with water. The cost averages around $6 per bag totaling just over $400 before tax. , QUICKRETE also has a useful calculator to determine how many bags of concrete you’ll need. We wanted a 4″ x 12′ x 8′ slab and used about 55, 80 lb. bags. Step 1: Mark the Location of the Shed. This shed will be placed on the property line and we used a laser distance measurer to ensure we had the right distance from the house., Decided I should do a project with 60 bags. Wasn't fun, but it got done. Then I came across Sakrete Maximizer. 80lb bag makes 60% larger quantity of mix than usual concrete mix. I did 44 bags for 10'X16' 3.5" slab. I absolutely love that concrete mix. So much easier to work with. I don't think I am going back to regular stuff., Here is a concrete quantity and cost comparison of laying a concrete slab yourself. The total price is based on each 80-lbs (32.6kg) bag of concrete costing $6.17 in 2022. Dimensions, 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., 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 ..., Blue Circle High Strength Ready To Use Concrete (40N) - 20kg. (282) £11.50. £0.58 per KG. Blue Circle Quick Set Concrete - 20kg. (229) £11.40. £0.57 per KG. Blue Circle Multi-Purpose Ready To Use Concrete Tub - 5kg., Cost per Bag. A concrete slab 36" X 36" at a depth of 4", has a volume of 3 ft³ = 10 x 40 # bags. 10 Bags. Total Bag Weight 400 lb. Calculated at 133.3 lb per ft³ - Allow extra for waste. Pre-Mix Concrete Bag Calculator Calculated at 133.3 lb per ft³ - Allow extra for waste. Cubic Feet.