Relative yield is a measurement that tells how great a volume of concrete was produced, relative to the amount of concrete that was purchased and mixed. While calculating relative yield uses a formula with only two variables, in order to calculate relative yield, there are several simple calculations that must be made to determine the numbers to plug into the equation. A calculator can help with these equations, however if you are good with numbers, you can complete the calculations using scrap paper, as it uses only subtraction and division.
Weigh the empty bucket and container, and record the weight of each.
Mix the concrete and water in the container, following the proportional instructions on the concrete bags, which vary among different mixes.
Fill the bucket with mixed concrete.
Weigh the bucket when filled with concrete.
Find the unit weight by subtracting the weight of the empty bucket from the weight of the full bucket, and divide the result by the volume of the bucket.
Weigh the container, and subtract the weight of the empty container to determine to weight of concrete in the container.
Add the weight of the concrete in the container to the weight of the concrete in the bucket to find the total weight of the mixed concrete.
Divide the weight of the mixed concrete by the unit weight to find the yield.
Divide the yield by the amount of concrete mix used to find the relative yield.