# First Pass Yield Calculator

> Find the share of units that passed with no rework of any kind.

Page: https://freecalculator.tech/tools/first-pass-yield-calculator
Last reviewed: 2026-09-16

## Formula

FPY = (Units passing first time ÷ Units started) × 100

- FPY = (Units passing first time ÷ Units started) × 100.
- Inputs used: Units started, Units passing first time.
- Edge handling: Units started is required.; Units started cannot be negative.; Units started must be no more than 1000000000000.; Units passing first time is required.; Units passing first time cannot be negative..

## Inputs

- Units started
- Units passing first time

## Worked example: 462 of 500 units right first time

Units that needed rework are excluded from the pass count.
1. Start with Units started: 500, Units passing first time: 462.
2. Apply the method: FPY = (Units passing first time ÷ Units started) × 100.
3. Units that needed rework are excluded from the pass count.

## Common questions

### Where does this formula come from?

ASQ quality resources, yield measures: first pass yield excludes reworked units from the pass count. See the source link on this page.

### What kind of calculation is this?

The proportion of units that passed without rework, repair, retest or reinspection. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

A final yield that counts reworked units as passes will read higher than first pass yield; the two are different measures. Arithmetic over the counts entered — it cannot tell whether the inspection behind them was complete or consistent.

### How do I use the First Pass Yield Calculator?

Enter the required values for Units started, Units passing first time. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the First Pass Yield Calculator use?

FPY = (Units passing first time ÷ Units started) × 100 The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the First Pass Yield Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this first pass yield calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- American Society for Quality — https://asq.org/quality-resources/process-capability

## Cite this page

- APA: Free Calculator. (2026, September 16). First Pass Yield Calculator. https://freecalculator.tech/tools/first-pass-yield-calculator
- MLA: "First Pass Yield Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/first-pass-yield-calculator.
- Link: First Pass Yield Calculator — Free Calculator, https://freecalculator.tech/tools/first-pass-yield-calculator