First-Pass Yield Calculator

How the first-pass yield calculator works

First-pass yield is units accepted without rework divided by units started. Accepted yield adds units later accepted after rework to first-pass accepted units, then divides by started units. Scrap rate uses scrapped units over the same denominator.

Every unit belongs to just one outcome category. Accepted-first-pass plus accepted-after-rework plus scrap cannot exceed started units; a remainder is shown as unresolved. At zero started units, all outcomes must be zero and yield percentages are unavailable.

Recovered output can improve final accepted yield while leaving first-pass yield unchanged. This cohort calculation does not count repeated rework attempts, compute rolled throughput yield, infer process capability or establish a quality guarantee. Keep cohort boundaries and acceptance criteria consistent.

Worked example

Of 1,000 started units, 920 pass without rework, 60 are accepted after rework and 20 are scrapped. First-pass yield is 92%, accepted yield including rework is 98%, scrap share is 2% and no units remain unresolved.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

• Vorne: first-time good parts and rework