Work out yield from multiple steps instantly with clear inputs, formula shown and shareable results.
Sequential step yields multiply, so three steps at 98%, 96% and 99% give an overall yield of 93.1%, not 97.7%. To finish a target quantity you must start the target divided by overall yield, which is how release quantities are set in multi-stage manufacturing.
Multi-step yield
Overall yield = y1 x y2 x y3
Release quantity
Starts required = target output / overall yield
Twenty steps at 99% each give only 81.8% overall. In semiconductor and electronics manufacturing with hundreds of steps, per-step yield must reach 99.99% for a viable line.
Report both. Step yield after rework flatters the process; first-pass yield at each step shows where the real losses are and where to improve.