First pass yield

First pass yield (FPY), also known as throughput yield (TPY), is defined as the number of units coming out of a process divided by the number of units going into that process over a specified period of time.Only good units with no rework or scrap are counted as coming out of an individual process. First pass yield (FPY), also known as throughput yield (TPY), is defined as the number of units coming out of a process divided by the number of units going into that process over a specified period of time.Only good units with no rework or scrap are counted as coming out of an individual process.