How do you calculate good burn-in capacity?

Multiply devices per cycle by available cycles for gross capacity, then multiply by uptime and by first-pass yield. Here 4 units/cycle times 480 cycles is 1,920 gross; at 90% uptime and 97% yield that leaves about 1,676 good units.

What is the difference between gross and good capacity?

Gross capacity (1,920 here) is what the chamber would produce running perfectly. Good capacity (about 1,676) subtracts downtime loss (192 units) and yield loss (about 52 units) to give shippable output.

What is a good first-pass yield after burn-in?

For mature listed electronics, 96-99% first-pass yield after burn-in is common — burn-in is meant to catch a small fraction of infant failures. The 97% here is healthy; yields below ~95% suggest a real process or component problem, not just normal screening.

How much does chamber uptime affect capacity?

A lot, because it multiplies directly. At 90% uptime you lose 10% of gross straight off the top — 192 units in this example. Improving uptime to 95% would recover roughly half of that downtime loss.

Why is yield loss smaller than downtime loss here?

Because uptime (90%) removes more than yield (97%) does. Downtime cuts 192 units off the gross 1,920, while the 3% yield fallout only removes about 52 of the units that remain after downtime.

Does more cycles always mean more good devices?

Only if uptime and yield hold. Adding cycles raises gross capacity linearly, but if the extra loading strains the chamber and uptime drops, good capacity can grow slower than expected.

Security, Fire & Life Safety Products calculator

Burn-in capacity Calculator

Burn-in capacity tells you how many good fire and life-safety devices a burn-in operation can actually deliver over a planning window, after chamber downtime and post-burn-in failures take their cut. Burn-in — running detectors, panels, and communicators at elevated temperature and voltage to force infant-mortality failures — is a reliability gate for listed safety electronics, and its throughput often governs how fast a product line ships. Reliability and operations planners use this number to size chamber time, commit to delivery dates, and spot when burn-in becomes the constraint. It separates gross oven throughput from the good units that survive.

What this calculator does

Estimate burn-in capacity for security, fire and life safety products using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.
Use it when burn-in capacity in security, fire and life safety products is being asked to take on more work and you need to know if there is room.
It computes good burn-in output as devices-per-cycle times available cycles, then derates that gross figure by chamber uptime and post-burn-in first-pass yield.

Formula used

Gross burn-in capacity = burn-in capacity output per cycle × available burn-in capacity cycles
Good burn-in capacity = gross capacity × expected burn-in capacity uptime × expected burn-in capacity first-pass yield

Inputs explained

Devices per burn-in cycle:
Burn-in cycles available in the window:
Burn-in chamber uptime:
Post burn-in first-pass yield:

How to use the result

Use it when planning burn-in chamber loading, committing ship dates for listed electronics, or checking whether burn-in is the line's bottleneck.
It assumes uptime and yield are independent multipliers; a systemic thermal issue that simultaneously lowers both won't be modeled accurately.

Current U.S. benchmarks

Manufacturing hourly earnings average $30.27 (BLS, Jun 2026), up 4.4% from a year earlier. Median machinist pay is $28.24/hr (OEWS 2025), with state medians on each state page. Manufacturers have 529k open positions nationally (BLS JOLTS).

Common questions

How do you calculate good burn-in capacity? Multiply devices per cycle by available cycles for gross capacity, then multiply by uptime and by first-pass yield. Here 4 units/cycle times 480 cycles is 1,920 gross; at 90% uptime and 97% yield that leaves about 1,676 good units.
What is the difference between gross and good capacity? Gross capacity (1,920 here) is what the chamber would produce running perfectly. Good capacity (about 1,676) subtracts downtime loss (192 units) and yield loss (about 52 units) to give shippable output.
What is a good first-pass yield after burn-in? For mature listed electronics, 96-99% first-pass yield after burn-in is common — burn-in is meant to catch a small fraction of infant failures. The 97% here is healthy; yields below ~95% suggest a real process or component problem, not just normal screening.
How much does chamber uptime affect capacity? A lot, because it multiplies directly. At 90% uptime you lose 10% of gross straight off the top — 192 units in this example. Improving uptime to 95% would recover roughly half of that downtime loss.
Why is yield loss smaller than downtime loss here? Because uptime (90%) removes more than yield (97%) does. Downtime cuts 192 units off the gross 1,920, while the 3% yield fallout only removes about 52 of the units that remain after downtime.

Last reviewed 2026-05-12.