How do you calculate end-of-life tooling reserve?

Multiply parts per cycle by remaining cycles for gross capacity, then multiply by uptime and first-pass yield. In the default, 4 parts x 480 cycles = 1,920 gross, discounted by 90% uptime and 97% yield to 1,676 good parts.

Why is good capacity lower than gross capacity?

Gross capacity assumes every cycle runs and every part is good. Real tools lose parts to downtime and scrap. Here 192 parts are lost to downtime and about 52 to yield, dropping 1,920 gross to 1,676 good.

What uptime and yield should I use for an end-of-life tool?

Use the tool's recent actuals, and consider derating them because worn tooling tends to run slower and scrap more. The default assumes 90% uptime and 97% first-pass yield.

When should I retire versus rebuild a tool?

Compare the good reserve against your remaining demand. If 1,676 good parts covers the last order and service commitments, run it out; if not, rebuild or cut a replacement before the reserve runs dry.

Does this account for tool wear accelerating near end of life?

No — it applies flat uptime and yield. If you know the tool degrades in its final cycles, enter conservative percentages so the reserve isn't overstated.

What is first-pass yield in this context?

The fraction of parts that come off the tool good the first time, without rework or scrap. At 97% it costs about 52 parts across the run; lower yields eat the reserve much faster.

Tooling, Fixtures, Dies & Mold Economics calculator

End-Of-Life Tooling Reserve Calculator

When a mold, die or stamping tool nears the end of its rated life, you need to know how many good parts it can still make before it must be retired or rebuilt — that's the end-of-life tooling reserve. It takes the parts per cycle and remaining cycles to get gross capacity, then discounts for realistic uptime and first-pass yield to land on good, sellable parts. Tooling engineers and program managers use it to decide whether the reserve covers a last production run, a service-parts commitment, or the bridge until a replacement tool arrives. Overestimate and you strand a customer; underestimate and you scrap a tool with life left in it.

What this calculator does

Estimate end-of-life tooling reserve for tooling, fixtures, dies and mold economics using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.
Use it when end-of-life tooling reserve in tooling, fixtures, dies and mold economics is being asked to take on more work and you need to know if there is room.
It calculates the good-part capacity remaining in a tool by discounting gross cycle capacity for uptime and first-pass yield.

Formula used

Gross end-of-life tooling reserve capacity = end-of-life tooling reserve output per cycle × available end-of-life tooling reserve cycles
Good end-of-life tooling reserve capacity = gross capacity × expected end-of-life tooling reserve uptime × expected end-of-life tooling reserve first-pass yield

Inputs explained

Good parts produced per press cycle:
Remaining tool life in cycles:
Expected machine uptime:
Expected first-pass yield:

How to use the result

Use it when a tool approaches its rated cycle life and you must size a last-time-buy, service-parts run or bridge quantity.
A worn tool's yield and uptime often degrade as it nears failure, so a flat percentage can overstate what the last cycles actually deliver.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 319.371 (BLS, May 2026), up 19.5% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 14,378 furniture and related products establishments employing about 355,594 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate end-of-life tooling reserve? Multiply parts per cycle by remaining cycles for gross capacity, then multiply by uptime and first-pass yield. In the default, 4 parts x 480 cycles = 1,920 gross, discounted by 90% uptime and 97% yield to 1,676 good parts.
Why is good capacity lower than gross capacity? Gross capacity assumes every cycle runs and every part is good. Real tools lose parts to downtime and scrap. Here 192 parts are lost to downtime and about 52 to yield, dropping 1,920 gross to 1,676 good.
What uptime and yield should I use for an end-of-life tool? Use the tool's recent actuals, and consider derating them because worn tooling tends to run slower and scrap more. The default assumes 90% uptime and 97% first-pass yield.
When should I retire versus rebuild a tool? Compare the good reserve against your remaining demand. If 1,676 good parts covers the last order and service commitments, run it out; if not, rebuild or cut a replacement before the reserve runs dry.
Does this account for tool wear accelerating near end of life? No — it applies flat uptime and yield. If you know the tool degrades in its final cycles, enter conservative percentages so the reserve isn't overstated.

Last reviewed 2026-05-12.