Enter the depth, width and length of your concrete slab to calculate the number of cubic yards and concrete bags needed to complete your project.
Step 2. Place the tape measure down the side of the slab to measure the depth of the concrete. Typical depth for most slabs is four inches. Convert the four inches into feet. Divide four inches by 12 inches and the foot measurement is equal to 0.33 feet. Overview. All concrete is sold by the cubic yard. A cubic yard is equal to a cube that is three feet wide by three feet high by three feet deep. The total volume is equal to 27 cubic feet. How to Measure Concrete for Patios. Concrete for your driveway, sidewalk or patio is measured and then converted to CU. YDS. to place an order with your local ready mix plant. The math below applies to slabs and poured walls not casings or columns.This equation requires length x width x thickness. Ad 5. If you're calculating for Cubic Feet or Cubic Yards of Concrete needed, you will need to convert your inch measurements to Engineers Scale. Engineers scale is basically taking a foot (12 inches) and converting it into10ths. The engineers scale also eliminates the fractions of an inch. How to Measure Concrete to Be Poured. Measuring the area where Concrete will be placed to calculate how many Cubic Yards, Cubic feet (or Cubic Meters) will be needed. Step 1. Measure the overall area into which the concrete for the slab will be poured. In this case the slab is 12 feet wide by 14 feet long. Multiplying the two measurements, the area is equal to 168 square feet. Overview. All concrete is sold by the cubic yard. A cubic yard is equal to a cube that is three feet wide by three feet high by three feet deep. The total volume is equal to 27 cubic feet. To calculate the volume of concrete you need, you must measure the surface area of the slab and multiply this by the thickness of the slab. You usually measure the length and width of the slab in feet, thus giving you a value for area in square feet when you multiply them, but you usually measure thickness in inches. When ordering concrete for a large project, such as the slab for a new garage, you need to quote the amount you need in cubic yards. For smaller projects, such as the floor for a garden shed, cubic feet is a more appropriate unit. Instructions. Measure the dimensions of your site--length, width, depth--in feet. These measurements are all that are required for a typical site, ie. slabs, but take all relevant measurements for irregular shapes. Measure twice, to ensure accuracy Use the slab calculator to figure the concrete needed for the porch surface. Use the footing calculator to calculate the sides of the porch and the steps. Here is an example: This porch has 9 sq. feet of porch surface, so enter in the slab calculator 4 thickness by 3' width by 3' length. Atlanta Brick & Concrete in Atlanta, GA Use this concrete calculator as a quick and easy way to determine how much concrete you will need. Calculating the amount of Concrete Needed For Slabs(including odd shapes). Rule of thumb: add 1 / 4  to the thickness of your slab for your slab concrete budget. Enter the depth, width and length of your concrete slab to calculate the number of cubic yards and concrete bags needed to complete your project.. Thickness: inches Width: feet Length: feet.  To figure the volume of concrete needed, multiply the length by the width by the depth (in feet) to arrive at the number of cubic feet. Don't forget to account for the trenched perimeter. Divide the total by 27 and add 5 percent to calculate the number of yards of concrete you'll need. Our slab required 7 yards. 
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