Calculate first pass yield (FPY) as first-pass good units divided by units started, or from scrap and rework counts, with optional rolled throughput yield.

Count each started unit once. First-pass good excludes all units requiring rework.

Optional multi-step yield
Optional. Enter 2–5 percentages separated by commas or new lines. Blank omits RTY; closing this section keeps entered values active.

First Pass Yield Formula

FPY = QU / TU × 100

Variables:

  • FPY is the First Pass Yield (%)
  • QU is the units passing on the first attempt without rework
  • TU is the total units started in the same cohort

To calculate First Pass Yield, divide first-attempt good units by units started in the same cohort, then multiply by 100. Reworked units remain first-pass losses even when later recovered.

How to Calculate First Pass Yield?

The following steps outline how to calculate the First Pass Yield.

  1. First, count units passing the first attempt without rework. 
  2. Next, count all units started in the same cohort. 
  3. Next, gather the formula from above: FPY = QU / TU * 100.
  4. Finally, calculate the First Pass Yield.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

first-attempt good units = 95

units started = 120; FPY = 95 / 120 × 100 ≈ 79.167%

FAQ

What is First Pass Yield (FPY)?
First Pass Yield (FPY) is a metric used to measure the efficiency and quality of a production process. It divides units accepted on the first attempt without rework by units started in the same cohort, then multiplies by 100. In the scrap/rework mode, those first-pass classifications must be disjoint. The displayed potential final yield assumes all rework succeeds; actual final yield is shown only when recovered units are entered.

Why is First Pass Yield important?
First Pass Yield is important because it directly reflects the effectiveness of a manufacturing process. A high FPY indicates a process that produces a high ratio of quality products in the first pass, reducing waste and improving production efficiency.

How can one improve First Pass Yield?
Improving First Pass Yield can be achieved by identifying and eliminating sources of defects in the production process, implementing quality control measures, and continuous monitoring and adjusting the process to maintain high-quality standards.

Can First Pass Yield be used for all types of production?
FPY can be used where the unit, first attempt, acceptance criteria and counting boundary are consistently defined. Observed counts are whole units. Reverse modes are planning expectations and may produce fractional outputs; rounded whole-unit planning figures are labeled separately. Optional RTY multiplies 2–5 entered sequential conditional step yields. Closing its disclosure keeps the entered step yields active; blank omits RTY.