First Pass Yield

First Pass Yield (FPY) is the percentage of units that complete a manufacturing step or process correctly on the first attempt, with no rework, repair, scrap, or retest. It is calculated as good units passing first time divided by total units entering the process, multiplied by 100. FPY is also called throughput yield, first-time yield, or first-time-right rate.

On the shop floor, FPY acts as an early warning system at each workstation, test gate, or assembly cell. It records how many parts move forward without a correction loop, exposing the hidden factory of rework that consumes labor, machine time, and queue space while adding no shippable output. Manufacturing teams segment FPY by operation, product family, shift, machine, or supplier lot to pinpoint where first-pass conformance breaks down. In receiving and warehousing, the same logic applies to incoming inspection, put-away accuracy, label scans, counts, and kitting: a receipt processed correctly the first time avoids discrepancy resolution and relabeling. For raw material tracking, a low FPY at the first operation often isolates whether the defect comes from supplier material, handling damage, misidentification, or process setup before downstream value is added. FPY thus controls production release, replenishment signals, and root-cause investigation because it reveals instability that final output hides.