Six SigmaQuality

Rolled Throughput YieldRTY

The probability a unit passes through every step of a process defect-free — the product of each step's first pass yield.

Rolled Throughput Yield (RTY) is the product of the first pass yields of every step in a process. It reveals the true end-to-end quality that single-step yields hide.

The math is sobering: ten steps at 95% FPY each give an RTY of only about 60%. RTY exposes the cumulative "hidden factory" of rework and is a key metric in Six Sigma.

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First Pass Yield Calculator→Cost of Quality guide→
Related Terms
First Pass Yield
The percentage of units that pass through a process correctly the first time, with no rework or repair.
Cost of Quality
The total cost of achieving quality (prevention + appraisal) plus the cost of failing to (internal + external failure).
Scrap
Material or product that fails quality requirements and cannot be reworked, representing pure loss.
DPMO
A normalized defect metric that allows fair comparison of quality across processes of different complexity.
Sigma Level
A measure of process capability expressed in standard deviations between the mean and the nearest spec limit.

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