First Pass Yield (FPY) Calculator

Summary

Calculate First Pass Yield per process step and Rolled Throughput Yield (RTY) across up to 8 steps, with Sigma level estimation.

How it works

1. Add one or more process steps using the "Add Step" button (up to 8 steps).
2. Enter the number of units started and units passed without rework for each step.
3. The calculator shows the FPY for each individual step as you type.
4. Rolled Throughput Yield (RTY) is calculated as the product of all step FPYs.
5. DPMO is derived from RTY: DPMO = (1 − RTY) × 1,000,000.
6. Sigma level is estimated from DPMO using a standard lookup table.

Use cases

• Identify which manufacturing step has the lowest yield and focus improvement efforts there.
• Compare RTY across production lines or product variants.
• Estimate process Sigma level without a full DPMO study.
• Track FPY trends after implementing process changes.
• Report quality metrics to management or customers.
• Set targets for Six Sigma improvement projects.

Frequently Asked Questions