Some construction projects require the demolition of existing concrete. It's important to estimate this quantity correctly to ensure you've made proper arrangements for the waste material. For most applications, waste concrete is measured by weight. With the proper tools, and an understanding of the material, calculating crushed concrete can be simple and straightforward.

## Step 1

Measure the existing concrete structure. You'll need to measure the length, the width and the depth of the concrete. All measurement should be made in feet. Write these measurements down.

## Step 2

Calculate the volume of the existing concrete. Multiply the length by the width to produce the area. Then multiply the area by the depth of concrete to find the volume in cubic feet. Right this number down.

## Step 3

Calculate the number of pounds of concrete. Multiply the volume by 150. The unit weight for reinforced concrete is approximately 150 pounds per cubic foot. Right this number down.

## Step 4

Convert pounds to tons. Divide the number of pounds of concrete by 2000. Right this number down. Most vendors and trucking companies buy and sell crushed concrete in U.S. tons.