How do you calculate AOI inspection capacity?

Multiply boards inspected per cycle by available cycles per shift to get gross capacity, then multiply by uptime and first-pass yield. With 1 board/cycle, 2,200 cycles, 91% uptime and 96% first-pass yield, usable capacity is about 1,922 boards/shift against a gross of 2,200.

Why is usable capacity lower than gross AOI capacity?

Two losses stack on top of gross: downtime (jams, reprogramming, light recalibration) and boards pulled for review when the AOI flags a possible defect. In the example those remove 198 and roughly 80 boards respectively, dropping 2,200 gross to about 1,922 usable.

What is a good AOI uptime percentage?

Well-run SMT lines target 90-95% AOI uptime; below about 85% you usually have a programming, conveyor handoff, or false-call problem rather than a hardware fault. The 91% default here is realistic for a mature, stable program.

Does first-pass AOI yield reduce capacity or just quality?

It reduces effective throughput because flagged boards leave the main flow for review or disposition. At 96% first-pass yield roughly 80 boards/shift are held, so improving the SMT process upstream directly recovers inspection capacity.

How many boards can one AOI machine inspect per shift?

It depends on cycle time and board size, but a single inline AOI clearing one board per cycle over 2,200 cycles yields about 1,922 usable boards/shift at typical uptime and yield. Large or dense boards with longer cycle times will be well under that.

AOI capacity vs ICT capacity, which limits the line?

AOI is usually faster per board than in-circuit test, so AOI rarely limits a line on its own. Compare the usable boards/shift from this calculator against your ICT throughput to find the true downstream bottleneck.

Electronics Manufacturing calculator

AOI Inspection Capacity Calculator

AOI (automated optical inspection) inspection capacity is the number of PCBs an inline or offline AOI station can actually clear in a shift once you account for machine availability and the boards pulled out for verification. SMT process and test engineers use it to decide whether one AOI can keep pace with the placement line ahead of it or whether boards will queue at inspection. It matters because AOI is usually the throughput pinch point right after reflow: an undersized AOI either becomes the bottleneck or tempts operators to skip verification. Sizing it against real uptime and first-pass yield keeps the line balanced and the review queue manageable.

What this calculator does

Estimate AOI inspection capacity from boards per inspection cycle, available cycles, machine uptime, and first-pass inspection yield.
a quality or production engineer is checking whether AOI capacity supports SMT output
It computes usable AOI inspection capacity in boards per shift after derating gross cycle output by machine uptime and first-pass yield.

Formula used

Gross AOI board capacity = boards inspected per AOI cycle × available AOI cycles
Usable AOI inspection capacity = gross AOI board capacity × AOI uptime × first-pass AOI yield

Inputs explained

Boards inspected per AOI cycle:
Available AOI cycles:
AOI machine uptime:
First-pass AOI yield:

How to use the result

Use it when balancing an SMT line, justifying a second AOI head, or checking whether inspection can absorb a planned production ramp.
It treats uptime and first-pass yield as flat averages; bursty defect clusters or a long jam can drop real throughput below the modeled number for that shift.

Current U.S. benchmarks

The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
The U.S. has 11,261 computer and electronic products establishments employing about 815,443 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate AOI inspection capacity? Multiply boards inspected per cycle by available cycles per shift to get gross capacity, then multiply by uptime and first-pass yield. With 1 board/cycle, 2,200 cycles, 91% uptime and 96% first-pass yield, usable capacity is about 1,922 boards/shift against a gross of 2,200.
Why is usable capacity lower than gross AOI capacity? Two losses stack on top of gross: downtime (jams, reprogramming, light recalibration) and boards pulled for review when the AOI flags a possible defect. In the example those remove 198 and roughly 80 boards respectively, dropping 2,200 gross to about 1,922 usable.
What is a good AOI uptime percentage? Well-run SMT lines target 90-95% AOI uptime; below about 85% you usually have a programming, conveyor handoff, or false-call problem rather than a hardware fault. The 91% default here is realistic for a mature, stable program.
Does first-pass AOI yield reduce capacity or just quality? It reduces effective throughput because flagged boards leave the main flow for review or disposition. At 96% first-pass yield roughly 80 boards/shift are held, so improving the SMT process upstream directly recovers inspection capacity.
How many boards can one AOI machine inspect per shift? It depends on cycle time and board size, but a single inline AOI clearing one board per cycle over 2,200 cycles yields about 1,922 usable boards/shift at typical uptime and yield. Large or dense boards with longer cycle times will be well under that.

Last reviewed 2026-05-12.