NOVEL THINKING

For our next example, let’s say we need to construct 4 curbs with the following measurements: The calculator would first work out the total volume of the 4 curbs: $$Curb\,volume = Curb\,depth \times Curb\,height \times Length = 3\,in \times 4\,in \times 10\,ft = 0.8333\,ft^3$$, $$Gutter\,volume = (Gutter\,width + Curb\,depth) \times Flag\,thickness \times Length = (10\,in + 3\,in) \times 3\,in \times 10\,ft = 2.7083\,ft^3$$, $$Volume = Curb\,volume + Gutter\,volume = 0.8333\,ft^3 + 2.7083\,ft^3 = 3.54\,ft^3$$, $$Total\,volume = Volume \times Quantity = 3.54\,ft^3 \times 4 = 14.167\,ft^3$$. One cubic yard is equal to the volume of a cube with edges that are one yard (three feet) in length. Most concretes in construction are lime-based, such as Portland cement … . For the most part, ready-mix concrete from a truck is more cost-effective than bags and makes sense if you have a mid-size project and can pour all at once.

Calculating bags is a little less straight forward since each bag size will fill different volumes. I want to estimate how many 40lb bags of concrete I need.

Our online concrete calculator is a powerful tool that you can use to help ensure your next landscaping project goes smoothly.

(all yields are approximate and do not allow for uneven substrate, waste, etc.) volume = width × length × height

Order additional concrete for your project.

Find Qualified Concrete Professionals in Your Area. Use the following yields per each bag size: 40 pound bag yields .011 … When you start any construction project, it’s important that you have an idea of how much material you are likely to need. Concrete is a composite material used for all kinds of construction projects, especially where high compressive strength is required. Project difficulty: difficult.

Completely settling in place might take several years, depending on climate and other conditions. Consider additional costs for a ready-mix delivery. Let’s say I need to construct a square concrete slab that is 12 feet wide (an area of 144 square feet) and 4 inches deep.

Using the measurements provided, our calculator first works out the volume of the required concrete mix using the formulae given below. On average it will take 90 40lb bags, 60 60lb bags, or 45 80lb bags to fill one cubic yard of concrete. We know this can be tricky when working with concrete, especially when estimating. Real-time graphics. Finally, the calculator sums up the volume under the platform and each step to calculate the total volume in cubic yards: $$Total\,volume = Volume\,under\,platform + Volume\,under\,steps = 2016\,yd^3 + 315\,yd^3 + 630\,yd^3 + 945\,yd^3 = 3906 \,yd^3$$.

The radius is equal to the diameter divided by two.

On average it will take 90 40lb bags, 60 60lb bags, or 45 80lb bags to fill one cubic yard of concrete.

Get a concrete cost estimate for the project. To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield.

Rebar or fiber or steel mesh should be installed to reinforce the concrete and to prevent cracking in the future.

Forms must be installed to create the edges of a slab or contain a footing. The total volume is calculated using the formula: $$Volume = Length \times Width \times Thickness$$, $$Volume = \pi \times Radius^2 \times Depth$$, $$Volume = \pi \times (Outer\,radius^2 – Inner\,radius^2) \times Height$$, $$Volume = Curb\,volume + Gutter\,volume$$, $$Curb\,volume = Curb\,depth \times Curb\,height \times Length$$, $$Gutter\,volume = (Gutter\,width + Curb\,depth) \times Flag\,thickness \times Length$$, $$Volume = Volume\,under\,platform + Volume\,under\,steps$$, $$Volume\,under\,platform = Platform\,depth \times Rise × Width \times Number\,of\,steps$$, $$Volume\,under\,step = Run \times Rise \times Width \times Number\,of\,Step$$. yds3 = (width ft × length ft × height ft) / 27.

Using the measurements provided, our calculator first works out the volume of the required concrete mix using the formulae given below. Well, our calculator can figure this out for you as well. Simply select from the multiple options in the drop down menu to select a different weight.

However, it’s easy to work this out by using our concrete calculator.

The price of the concrete is $108 per cubic yard. The gravel estimator does the following calculations: $$Volume = \pi \times Radius^2 \times Depth = \pi \times 1\,ft^2 \times 3\,in = 0.7854\,ft^3$$, $$Total\,volume = Volume \times Quantity = 0.7854\,ft^3 \times 5 = 3927\,ft^3$$, $$Weight = Total\,volume \times 145\,lb/ft^3 = 3927\,ft^3 \times 145 = 569\,lb$$, $$Bags = {Weight \over 40\,lb} = {569\,lb \over 40\,lb} = 14.2 \rightarrow 15\,bags$$.

We’ll cover the process for estimating concrete in detail below, but you can also use the calculator above to simplify the process. The calculator will indicate the number of 60 lb bags you will need to build a 4 inch or 6 inch slab.

Please note, other standard unit conversions that might be helpful are: $$145\,lb/ft^3 = 2400\,kg/m^3 = 3915\,lb/yd^3$$.

Measure the length, width, and height of the slab, footing, or column.

Also, if you know the price per unit volume, then our calculator can work out the total cost: $$Cost = Total\,volume \times Price\,per\,unit\,of\,volume$$. Circular slab with price per unit of volume, 4 curbs with price per unit volume and 50 lb bags of concrete.

Much of the work to pour concrete is done before the truck even arrives at the project. Before we begin please note: The number of bags required must be rounded up, otherwise you’ll be left without sufficient concrete. Add the volume for each rectangle to find the total volume.

Concrete, which is a mix of water, aggregate, and cement, is most commonly sold by the cubic yard, but is also available in pre-mixed bags. How many paths, slabs or post holes are you building. Welcome to the concrete calculator. It will help you calculate the number of bags of concrete required for your path, slab or post holes. I want to figure out how many bags of 40 lb concrete I need to do this. Estimate how many pre-mixed bags needed for smaller projects, if it may not be practical to order a truckload of concrete and pre-mixed bags make the most sense. For instance, if you are measuring a slab that is not a rectangle or circle, break it into different sections and measure the yards needed for each section first, then add them together.

Juan Rodriguez, Ready Mix Concrete Ordering Tips, On The House, Buying Concrete – 12 Tips to Determining Project Success, https://www.onthehouse.com/buying-concrete-12-tips-determing-project-success/. Simply select the desired units in the drop down options and our concrete calculator will do the following conversions: $$1\,ft = 12\,in = 0.33\,yd = 30.48\,cm = 0.3048\,m$$, $$1\,t = 2000\,lb = 0.893\,long\,ton = 907\,kg$$, $$1\,ft^3 = 1728\,in^3 =0.037\,yd^3 = 28,317\,cm^3= 0.0283\,m^3$$.

Welcome to the concrete calculator. Use our rectangular slab, footing, or poured wall concrete calculators. You’ll notice that we do this with all our examples (but the calculator does this for you!). This gives you 1.6 cubic feet. I want to construct a circular slab of concrete measuring 5 ft high.

Calculated results will reflect how many bags are needed for Block and Brick.

This dramatically reduces the probability of having insufficient concrete mix. Use our circular slab or column concrete calculators. Learn what affects the price before planning your new driveway project. If you forget the 1728 it is simply 12” x 12” x 12” or the number of cubic inches in a cubic foot. These Concrete Calculators work out the required cement and all-in ballast or cement, sharp sand and gravel required to complete a user defined volume of finished concrete.

The calculator will then tell you the number of bags you need based on the different size of bags we carry.

Add 5%-10% additional material to account for settling, spillage, and waste. Divide the steps into rectangles, then find the volume for each rectangle/cube. Use our masonry calculators and expert-written articles to plan your next concrete or masonry project.

Use our concrete steps calculator to easily estimate material for steps.

This will ensure you can complete your project in a single pour without needing to get more concrete to complete the project if you’re short.

It’s likely that you are wondering what to do if your units aren’t in feet and pounds. Call your supplier and understand these costs ahead of time and plan accordingly.

Make sure the installation team is ready for the installation and able to begin as soon as the truck arrives to avoid having it set up before the project can be completed and minimize idle time. Bags come in 40-pound, 60-pound, or 80-pound bags. I want to calculate how many 40 lb bags of concrete I need. It’s important to calculate the amount of material needed as accurately as possible since you often only get one chance for the pour. The calculator would perform the following calculations to calculate that the slab would need 174 bags: $$Volume = Length \times Width \times Thickness = 12\,ft \times 12\,ft \times 4\,in = 48\,ft^3$$, $$Weight = Total\,volume \times 145\,lb/ft^3 = 48\,ft^3 \times 145 = 6960\,lb$$, $$Bags = {Weight \over 40\,lb} = {6960\,lb \over 40\,lb} = 174\,bags$$. A standard brush finish will likely be on the low end of the price range, while a decorative finish with coloring will be on the high end of the range. On a scale of 1 to 5, the cost level is 2/5.

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Consider that for smaller projects there will likely be additional fees for ready-mix, such as delivery or short-load fees.[3]. Project cost: low cost. The ready mix concrete calculator does the following calculations: $$Volume = \pi \times (Outer\,radius^2 – Inner\,radius^2) \times Height = \pi \times (5\,ft^2 – 4.5\,ft^2) \times 5\,ft = 74.6\,ft^3$$, $$Weight = Volume \times 145\,lb/ft^3 = 74.6\,ft^3 \times 145 = 10819\,lb$$, $$Bags = {Weight \over 40\,lb} = {10819\,lb \over 40\,lb} = 270.4 \rightarrow 271\,bags$$, $$Cost = Volume \times Price\,per\,unit\,of\,volume = 74.6\,ft^3 \times 108\,$/yd^3 = $298.45$$, We imagine you are wondering what happens if you want to use concrete bags weighing different amounts.

Get hassle-free estimates from local concrete professionals for your concrete project. If you need to construct multiple concrete slabs/columns, etc., then our calculator can work out the total volume required: $$Total\,volume = Volume \times Quantity$$.

Not only will our calculator tell you how much concrete is required, it will also work out how many bags you will need and the total cost of the project. Try our rebar material and reinforcing mesh calculators to estimate the amount of reinforcement needed for your project. Calculate the concrete material needed to pour a slab, patio, footing, column, or post fill-project in cubic yards or pre-mix bags, and estimate the cost of materials. For concrete, the formula for volume is as follows: length x width x thickness.

$$Weight = Total\,volume \times 145\,lb/ft^3 = 14.167\,ft^3 \times 145 = 2054\,lb$$, $$Bags = {Weight \over 50\,lb} = {2054\,lb \over 50\,lb} = 41.08 \rightarrow 42\,bags$$, $$Cost = Total\,volume \times Price\,per\,unit\,of\,volume = 14.167\,ft^3 \times 108\,$/yd^3 = $56.67$$. Refer to table below that shows the coverage of different sizes of pre-mix bags. What are the dimensions of the path, slab or post holes you are building?

For more complex shapes check out our volume calculator.

The site must be measured and laid out. It is composed of fine and coarse aggregate which are bonded via fluid cement paste that hardens over time - usually about a week to reach over 50% of its final strength and a couple of weeks to reach 95% of it.

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