Quality calculator
First Pass Yield Calculator
Separate first-time quality from units that only pass after rework.
What this calculator does
- Measure how many units pass the first time without rework.
- Use when rework hides process quality problems.
- Measure how many units pass the first time without rework.
Formula used
- First pass yield = passed first time ÷ total units
- Rework rate = reworked units ÷ total units
Inputs explained
- Total units: undefined
- Passed first time: undefined
- Reworked units: undefined
- Failed / scrapped units: undefined
How to use the result
- Use when rework hides process quality problems.
- This is a planning calculator. Validate assumptions against your process data before using the result as a final quote, schedule, or engineering decision.
Common questions
- Which inputs usually drive the first pass yield result? total units, passed first time, reworked units, and failed / scrapped units usually have the biggest effect. When one of those assumptions changes, rerun the calculator and compare the new % result before updating the plan.
- What does the first pass yield calculator do? Measure how many units pass the first time without rework.
- What inputs do I need for the first pass yield calculator? You need total units, passed first time, reworked units, and failed / scrapped units. Use measured values from your line, quote package, supplier data, or current production plan whenever possible.
- How should I interpret the first pass yield result? Treat the % output as a planning estimate for quality work. Compare it against process history, quoted assumptions, and operating limits before making final decisions.
Last reviewed 2026-05-12.