Concrete Calculator

This concrete estimator will help you find out how much concrete you need by cubic yard. Plus, find how much 80lb and 60lb bags cover, estimate the slab area for triangular or octagonal shapes and more.

Tips on Measuring for Concrete

Your measurement methods will shift depending on the shape of your future concrete slab. For example, you’ll measure a rectangular shape using length and width. A circular shape requires that you find the diameter.

Once you find the dimensions of your slab, input them into the calculator along with the thickness. Enter your project area measurements rounded to the nearest foot. If you’d rather do the math yourself, simply measure length, width and height in feet. Then multiply these dimensions together. Divide the resulting number by 27 to find the cubic yardage.

Once you have your measurement in cubic yards, consult our True Cost Guide for concrete prices.

Different Kinds of Concrete

There are several kinds of concrete available for different home projects. If you’re not sure which type to get, don’t hesitate to talk to a concrete pro near you. Here are a few common varieties of concrete:

• Quick-set

  : Hardens in 20 to 40 minutes. Best for small projects.

• Regular-set

  : 24 to 48 hour set time. Used more for large projects.

• High-strength

  : Usually sets in 10 to 12 hours. Works well for foundation.

• Crack-resistant

  : This is a durable option that works well for walkways.

• Polymer

  : Uses epoxy binder to harden. Benefits depend on the type of resin used, but can include heat and weather resistance.

How to Buy Concrete

If you have a larger job, like a building a driveway or pool deck, it’s probably best to order concrete by the cubic yard or hire a concrete delivery service. For smaller jobs, like setting posts for fences or small curbs, mixing bags of concrete should be sufficient.

Always make sure to order a little extra concrete in case of mistakes or uneven ground.

Cost Factors

There are several things that can affect the cost of your concrete project, including:

• How complicated the project is

  : stairs will likely cost more than a slab, for example.

• Materials

  : polymer concrete is often more expensive.

• Labor prices

  : jobs that take longer and need more workers will have a higher price.

• Extra strength

  : adding rebar or mesh to the concrete will up the cost.

• Additional tasks

  : if pros need to remove debris, get rid of your existing patio or dig before starting, it will be more expensive.