First Pass Yield (FPY)

First Pass Yield (FPY) is a key manufacturing metric that measures the efficiency and quality of a production process. It represents the percentage of products that pass through a process step without requiring rework or repairs.

A high FPY indicates an efficient and high-quality process, while a low FPY suggests issues with defects or inefficiencies that need improvement.

Steps to Calculate FPY

1. Identify the Process Step

   • Choose a specific manufacturing step or the entire production line where FPY will be measured.

2. Count Total Units Entering the Process

   • Record the total number of units that begin the process (Input Units).

3. Count Defective Units

   • Identify and count the units that do not pass quality checks on the first attempt.
   • These are units that require rework, repairs, or are scrapped.

4. Calculate the Good Units

   • Subtract the defective units from the total units entered: $$\text{Good Units}=\text{Total Input Units}-\text{Defective Units}$$

5. Compute FPY

   • Use the formula: 
     
     

Example Calculation:

• Total units entering a process = 1,000
• Defective units requiring rework = 50
• Good units produced = 1,000 – 50 = 950
• FPY = (950 / 1,000) × 100% = 95%

A higher FPY indicates a more efficient and high-quality process, while a lower FPY suggests potential issues that need to be addressed.