# how many bags of concrete do i need calculator

Simply select from the multiple options in the drop down menu to select a different weight. 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. One cubic yard is equal to the volume of a cube with edges that are one yard (three feet) in length.

Simply select the desired units in the drop down options and our concrete calculator will do the following conversions: $$1\,ft = 12\,in = 0.33\,yd = 30.48\,cm = 0.3048\,m$$, $$1\,t = 2000\,lb = 0.893\,long\,ton = 907\,kg$$, $$1\,ft^3 = 1728\,in^3 =0.037\,yd^3 = 28,317\,cm^3= 0.0283\,m^3$$. Bags come in 40-pound, 60-pound, or 80-pound bags. For concrete, the formula for volume is as follows: length x width x thickness.

(all yields are approximate and do not allow for uneven substrate, waste, etc.) For each measurement of length, you are able to work in metric units (feet, yards, inches) or imperial units (centimeters, meters). 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.

I want to construct a circular slab of concrete measuring 5 ft high.
Consider additional costs for a ready-mix delivery. Ready-mix concrete typically starts around $115 per cubic yard but could cost upwards of$150 or more, depending on the mix and your location. It’s likely that you are wondering what to do if your units aren’t in feet and pounds.

I want to calculate how many 40 lb bags of concrete I need. On average it will take 90 40lb bags, 60 60lb bags, or 45 80lb bags to fill one cubic yard of concrete. For slabs the thickness can be substituted for the height measurement. Cost is usually determined by the size of the wall, the selected materials, and the amount of labor needed. To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield. Pre-mix bags usually range from $2.50 to$7, making them a cost effective choice for small projects. 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. The outer diameter is 10 ft and the inner diameter is 9 ft.

Using bags can be easier than ready-mix when you have many small pours or a small project where a truck is not practical or cost-effective.

When you start any construction project, it’s important that you have an idea of how much material you are likely to need. 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.

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.

If your project is small, you can use pre-mixed bags of concrete. 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. If you forget the 1728 it is simply 12” x 12” x 12” or the number of cubic inches in a cubic foot. The gravel estimator does the following calculations: $$Volume = \pi \times Radius^2 \times Depth = \pi \times 1\,ft^2 \times 3\,in = 0.7854\,ft^3$$, $$Total\,volume = Volume \times Quantity = 0.7854\,ft^3 \times 5 = 3927\,ft^3$$, $$Weight = Total\,volume \times 145\,lb/ft^3 = 3927\,ft^3 \times 145 = 569\,lb$$, $$Bags = {Weight \over 40\,lb} = {569\,lb \over 40\,lb} = 14.2 \rightarrow 15\,bags$$. Use the following yields per each bag size: 40 pound bag yields .011 …

Divide the steps into rectangles, then find the volume for each rectangle/cube.

$$Weight = Total\,volume \times 145\,lb/ft^3 = 14.167\,ft^3 \times 145 = 2054\,lb$$, $$Bags = {Weight \over 50\,lb} = {2054\,lb \over 50\,lb} = 41.08 \rightarrow 42\,bags$$, $$Cost = Total\,volume \times Price\,per\,unit\,of\,volume = 14.167\,ft^3 \times 108\,/yd^3 = 56.67$$.

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yds3 = (width ft × length ft × height ft) / 27

Let’s say I need to construct 5 columns measuring 2 feet in diameter and 3 inches high. The calculator would perform the following calculations to calculate that the slab would need 174 bags: $$Volume = Length \times Width \times Thickness = 12\,ft \times 12\,ft \times 4\,in = 48\,ft^3$$, $$Weight = Total\,volume \times 145\,lb/ft^3 = 48\,ft^3 \times 145 = 6960\,lb$$, $$Bags = {Weight \over 40\,lb} = {6960\,lb \over 40\,lb} = 174\,bags$$. Our calculator also works out the total concrete mix weight and required number of bags (using a standard 40lb bag of concrete which weights 145 pounds per cubic foot): $$Weight = Total\,volume \times 145\,lb/ft^3$$.

The volume for a circular space is equal to pi times the radius squared times the height. Enter the size of the slab you want to build in square feet.

Optionally enter the price per cubic yard, *The average price is $115 -$150 per cubic yard.

Don’t forget, it can be helpful to purchase slightly more concrete than the volume the estimator calculates to allow for spillage and alterations in slab depth. 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. On average it will take 90 40lb bags, 60 60lb bags, or 45 80lb bags to fill one cubic yard of concrete. Using the measurements provided, our calculator first works out the volume of the required concrete mix using the formulae given below.

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

Mixing bags on-site can become difficult if you’re pouring a large slab or have many footings.

Before we begin please note: The number of bags required must be rounded up, otherwise you’ll be left without sufficient concrete.

Check the bag you’re using to find the exact fill-rate for the product. Find out how much it costs to build a retaining wall.

Use our concrete steps calculator to easily estimate material for steps. Our calculator can do all the conversions for you, meaning you don’t have to.

Enter the number of bricks (8" x 2" x 4") or blocks (8" x 8" x16") in the box below that you plan to use for your project. The price of the concrete is $108 per cubic yard. volume = width × length × height Our online concrete calculator is a powerful tool that you can use to help ensure your next landscaping project goes smoothly. The average cost to install a concrete slab is$6 – \$20 per square foot.

yds3 = (π × radius ft × radius ft × height ft) / 27.

Calculate material for concrete steps or stairs by entering the stair width, rise, run, and number of stairs.