Why does yield apply after tool availability?

Parts cannot pass first inspection if the cycle never ran. The model removes downtime first, then applies first-pass yield to the parts the available cycles made.

What counts as a good part in this plan?

A part the cycle produces without a first-pass rejection. Reworkable parts still count as lost until they pass, matching the first-pass yield from the quality record.

How do I raise good parts over a tool life?

Availability and yield act at different layers. Downtime removes whole cycles, so a few points of uptime are worth more than the same points of yield in this model.

Does tool wear change the answer?

The plan holds availability and yield constant, so a tool that degrades late in life will deliver fewer good parts than shown. Recheck the plan near the end of the cycle count.

Composites, Fiberglass & Advanced Materials calculator

Tool Life Good-Part Output Calculator

Turn planned tool cycles into the good parts the tool can deliver, with downtime and scrap losses shown apart. Enter the cycles, availability, first-pass yield and the target.

What this calculator does

Good parts a tool delivers over its planned cycles after availability and first-pass yield losses.

Formula used

Gross parts = good parts per cycle × planned tool cycles
Parts lost to downtime = gross parts × (1 − tool availability ÷ 100)
Parts lost to scrap or rework = gross parts × tool availability ÷ 100 × (1 − first-pass yield ÷ 100)
Good parts = gross parts − parts lost to downtime − parts lost to scrap or rework
Gap to target = target good parts − good parts

Inputs explained

Good Parts per Tool Cycle: Good parts a cycle yields before inspection, from the tool plan.
Planned Tool Cycles: Cycles planned over the tool life, from the maintenance plan.
Tool Availability: Uptime share of planned cycle time, from tool logs.
First-Pass Yield: First-pass acceptance per cycle, from the quality record.
Target Good Parts: Good parts the plan must deliver, from the tool plan.

How to use the result

Best suited to sizing a tool life for a production plan, comparing availability and yield losses, checking a tool plan against a target.
A tool degrades late in life, so constant availability and yield overstate late output. Shared tooling splits cycle time across parts, which changes the target per part.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 280.569 (BLS, Aug 2026), up 6.6% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Steel mill PPI stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. New factory orders are up 8.5% year over year (Census).

Common questions

Why does yield apply after tool availability? Parts cannot pass first inspection if the cycle never ran. The model removes downtime first, then applies first-pass yield to the parts the available cycles made.
What counts as a good part in this plan? A part the cycle produces without a first-pass rejection. Reworkable parts still count as lost until they pass, matching the first-pass yield from the quality record.
How do I raise good parts over a tool life? Availability and yield act at different layers. Downtime removes whole cycles, so a few points of uptime are worth more than the same points of yield in this model.
Does tool wear change the answer? The plan holds availability and yield constant, so a tool that degrades late in life will deliver fewer good parts than shown. Recheck the plan near the end of the cycle count.

Last reviewed 2026-10-01.