Calculating the amount of concrete required for a project is essential to avoid both shortages and excess. Follow these steps to determine exactly how much concrete you'll need:

Step 1: Measure the Area

First, determine the dimensions of the space you’ll be working with. For rectangular or square slabs, measure the length and width in feet. For circular areas, measure the diameter. Be sure to also measure the desired thickness in inches.

Step 2: Convert Measurements

Convert the thickness from inches to feet by dividing by 12. This will ensure consistency in calculations:

• Thickness in feet = Thickness in inches ÷ 12

Step 3: Calculate the Volume

Next, calculate the volume of the space in cubic feet:

• Rectangular/Square Slabs:
• Circular Areas:

Step 4: Convert Volume to Cubic Yards

Concrete is typically sold by the cubic yard, so convert the volume:

• Volume (cubic yards) = Volume (cubic feet) ÷ 27

Step 5: Purchase with a Buffer

It’s wise to add an additional 10% to 15% to your total concrete to account for waste and variations in measurements.

Step 6: Double-Check with a Calculator

For added accuracy and ease, you can use an online concrete calculator. Many third-party tools are available to verify your manual calculations.

By following these steps, you can ensure that you order the correct amount of concrete and minimize waste.