How do you calculate concrete needed

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Shape Selection. Readymix Concrete Calculator Quote All fields marked with are required. Production of concrete is time-sensitive, and the concrete must be placed before it hardens since it is usually prepared as a viscous fluid.

Some concretes are even designed to harden more quickly for applications that require rapid set time. Alternatively, in some factory settings, concrete is mixed into dryer forms to manufacture precast concrete products such as concrete walls.

The process of concrete hardening once it has been placed is called curing, and is a slow process. Ensuring that the concrete is damp can increase the strength of the concrete during the early stages of curing. You might be wondering just how much concrete is in a cubic yard? A cubic yard is equal to 27 cubic feet or 46, cubic inches, or 45 80lb bags.

The volume for a rectangular space is equal to the length times the width times the height. For slabs, substitute the thickness for the height measurement. The volume for a circular space is equal to pi times the radius squared times the height. The radius is equal to the diameter divided by two. Add the volume for each rectangle to find the total volume.

For more complex shapes, check out our volume calculator. How Many Bags of Concrete do you Need? Pre-mixed bags are sold by companies like Quikrete or Sakrete, and come in pound, pound, or pound sizes.

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.

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.