All product manufacturing businesses want to increase the number of products manufactured in a specific period of time. The major thing that is a barrier in this is the defects. The defective products can severely affect the production line. It will decrease the manufacturing line and the number of products to sell, ultimately affecting the company’s overall profit.  

For example, if a company says its product line has a 100% total throughput rate. But most people can’t see that it actually requires massive amounts of rework which can disrupt the production lines. This additional work can cause additional money and also impact on-time delivery.  

So what’s the solution? To solve this problem, you’ll need a powerful but easy-to-see metric that can show that even if the total throughput rates are high, the production line has many issues. 

Fortunately, this type of metric does exist! It is known as Rolled Throughput Yield (RTY). 

Today many companies use the RTY forecast and RTY metrics to evaluate their overall process performance. This operation metric will help you to assess the “true” yield of a given production process.  

Do you also want to increase the profits of your business? Do you want to get more information about RTY? Keep reading! 

Today in this blog, we’ve explained the Rolled Throughput Yield (RTY) Definition and how to calculate RTY correctly. We’ve also discussed who can use the RTY metric and when to use it. 

Let’s begin. 

What is Rolled Throughput Yield (RTY)?

Here is the definition of the Rolled throughput yield (RTY): RTY is a powerful metric used to identify how many non-defective products are being produced on a production line. This will also determine whether the produced products meet the quality standard compared to the total number of products made. 

RTY will help you to make the entire production process defect-free. However, this also depends on the number of process steps that a product goes through in a production line.  

Most of the time, companies only measure the quality of the product at the last stage of the production line, and to get the total throughput rate, they later subtract this number from the total yield. This method fails because there are also many poor-quality materials throughout the process.  

On the other hand, RTY measures all the materials, including the products with manufacturing defects, while going through the multiple process steps of the entire production process. With the help of the RTY forecast and RTY metric, you can measure the yield at each process step of the entire operation. 

Types of Yield

There are two types of yields: 

• First Pass Yield (FPY)
• Rolled Throughput Yield (RTY)

First Time Yield (FTY), also known as Throughput Yield (TPY), is a unit-based metric. It can be calculated by dividing the number of good units (without defects) produced by the number of total units going into the process. The major drawback of this metric is that it only considers what goes as input and what comes as output. This means it will not consider any rework of scrap products having defects.  

On the other hand, the RTY metric works at an overall process quality level. This means it will consider entire process steps, including start-to-end operations. That’s why RTY is preferred over FPY or TPY. 

Who Uses Rolled Throughput Yield (RTY)?

Anyone who wants to improve their process’s production process can use the RTY metric. This operational metric is highly effective in determining the business’s total efficiency as it is also used in the Six Sigma method. 

According to the Six Sigma method, a lean business should promote increasing the overall profits of the business and at the same time reducing its waste. So, what’s the waste? Waste can be: 

• Defects in the product
• Excess manpower and administration cost time
• Overproduction
• Unnecessary transportation 
• Waiting time.

With the help of RTY, a business can easily measure defective products in a production line while eliminating waste. 

When To Use Rolled Throughput Yield (RTY)?

There are many benefits of using Rolled Throughput Yield (RTY) metrics. For example, you can use this metric to improve your manufacturing processes. 

RTY will help to 

• Identify the hidden factory.
• Reveal faulty material.
• Track improvement over time.

How to Calculate Rolled Throughput Yield (RTY)?

Businesses want to have 100% output results, but that’s impossible because all products passing through each process step are not 100% of the time.

So how is rolled throughput yield (RTY) calculated?

Here’s how to calculate RTY correctly: 

Suppose a production line has five process steps; each product has to go through these steps through inputs and output units. So, every product will go first into the input unit and come out at the output unit, and this will repeat at every process step. 

Look at the below table for reference: 

To calculate RTY, use this formula: 

RTY= [FTY (Step 1) * FTY (Step 2) * FTY (Step 3) * FTY (Step 4) * FTY (Step 5)]

Here’s how to calculate FPY: 

First Time Yield (FTY) = [Number of products without error / Total number of products]

So in this example, to calculate the RTY, you have to multiply all the values of FTY at each step. 

RTY= 0.9 * 0.89 * 0.94 * 0.93 * 0.91

RTY= 0.6372

So, RTY for the total five process steps is 63.72%. 

The Bottom Line

Now you know what Rolled Throughput Yield (RTY) is and how to calculate it. RTY is an effective and powerful metric to measure the quality of a process. Unlike First Time Yield (FTY), which only measures what goes at the input and what comes at the output, the RTY metric can be used to measure entire process steps from start to end operations. With the help of the RTY forecast and RTY matric, you can easily identify where defects are occurring at your production line.