Estimate cnc machine yield loss from the operating inputs that matter on the shop floor. This calculator keeps the time basis and output definition visible, then reports the main result with supporting capacity or loss measures. Use it for production planning, shift reviews, and quick what-if checks—not as a substitute for validated machine data or process qualification.
Yield loss % = (scrapped parts + reworked parts) ÷ total parts × 100. First-pass yield = 100% − yield loss %.
The main result translates the entered CNC machine operating conditions into a planning measure. Read it together with the supporting figures so a change in speed is not confused with a change in availability, quality, batch size, or demand.
Planning estimate only. Validate time studies, counts, and quality definitions against your production records before committing labor, tooling, or delivery dates.
For 1,000 produced parts with 25 scrapped and 15 reworked, yield loss is 4.00% and first-pass yield is 96.00%. At $8.50 per part, scrap is valued at $212.50.
Use one consistent period—such as a shift, day, or production order—for every time, count, and demand input.
Include changeovers as lost available time or as part of the measured cycle only if that matches the planning definition used throughout the calculation.
Count rejects in total production where requested, but use good units for demand coverage and saleable output.
Yes, but calculate each product separately when cycle time, cavity count, batch size, or quality performance differs materially.
Machine displays may exclude setup, planned stops, downstream work, scrap, or idle time. Match definitions and measurement boundaries before comparing values.
| Count | Treatment |
|---|---|
| Good | Accepted without rework |
| Rework | Recoverable but not first-pass good |
| Scrap | Discarded output |