OEE & Factory Performance calculator

First Pass Yield for OEE Calculator

First Pass Yield (FPY) is the share of units that pass every step correctly the first time — no rework, no rescue, no second trip through the line. It feeds directly into the quality term of OEE, which only credits parts that are good first time, so a strong OEE is impossible without a strong FPY. Quality engineers and CI leaders watch it because rework is invisible to a simple scrap count yet still burns capacity and margin. A unit that gets reworked and eventually ships still failed first pass, and FPY is the metric that refuses to let that loss hide.

What this calculator does

  • Calculate first pass yield for OEE & Factory Performance: units that pass first time as a share of all units started.
  • Use it to track first pass yield against target in OEE & Factory Performance.
  • It computes the percentage of units that were good on the first attempt out of all units started, plus the point gap to your target FPY.

Formula used

  • First pass yield = first-pass good units ÷ total units started × 100
  • Gap to target = target fpy − first pass yield

Inputs explained

  • First-pass good units: First-pass good units in the period — the numerator.
  • Total units started: Total units started in the same period — the denominator.
  • Target FPY: Your target, used to show the gap.

How to use the result

  • Use it when feeding the quality factor of an OEE calculation, or when rework is suspected of quietly consuming line time that scrap numbers don't reveal.
  • FPY treats any reworked unit as a first-pass failure, so a line that ships 100% of parts can still post a low FPY — it measures process capability, not final shippable yield.

Current U.S. benchmarks

  • U.S. manufacturing runs at 75.6% of capacity (Federal Reserve, May 2026). New factory orders are up 2.3% year over year (Census).

Common questions

  • How do you calculate first pass yield? Divide first-pass good units by total units started and multiply by 100. With 940 good units from 1000 started: 940 ÷ 1000 × 100 = 94%.
  • What is a good first pass yield? It varies by industry: high-volume electronics targets 99%+, while complex assembly may accept 90-95%. The example's 94% sits just 1 point under a 95% target — close, but worth closing on a high-runner.
  • What is the difference between FPY and final yield? Final yield counts every unit that eventually ships, including reworked ones. FPY only counts units good the first time. FPY is always equal to or lower than final yield, and the gap between them is your rework load.
  • How does FPY affect OEE? OEE's quality factor credits only first-pass good parts, so it tracks FPY closely. A 94% FPY caps the quality term at 94%, which then multiplies availability and performance to give overall OEE.
  • How is rolled throughput yield different from FPY? FPY is typically measured at one process or for the line as a whole. Rolled throughput yield (RTY) multiplies the FPY of every sequential step, so multi-step lines have an RTY well below any single station's FPY.

Last reviewed 2026-05-12.