How do you calculate functional test cost?

Multiply assemblies tested by the variable cost per assembly, then add labor/setup and fixture/overhead. With 1,200 assemblies at $1.75 plus $360 labor and $240 overhead, total cost is $2,700, or $2.25 per assembly.

What drives cost per assembly in functional test?

At low volumes the fixed labor and overhead dominate cost per assembly; at high volumes the variable per-unit cost dominates. Here the $600 of fixed adders spread over 1,200 units adds $0.50 on top of the $1.75 variable, giving $2.25 each.

What is a good functional test cost per assembly?

It varies widely by product complexity, but simple boards often test for well under a dollar while complex, long-cycle products run several dollars. Compare against the assembly's sell price; test should be a modest fraction, not a margin sink.

How does batch size change functional test cost?

Larger batches dilute the fixed labor and overhead across more units, lowering cost per assembly. Doubling the example batch to 2,400 units would drop cost per assembly toward $2.00 as the $600 fixed cost spreads further.

Should fixture and software cost go in functional test cost?

Yes, at least the amortized share for the run, because that burden is real and otherwise hides in overhead. Putting it in the overhead field surfaces it in cost per assembly so quotes reflect true test cost.

Functional test vs ICT cost, which is higher?

Functional test is usually more expensive per assembly because it powers and exercises the product with longer cycles and more fixture and software burden, while ICT is faster and cheaper per board. Use both calculators to see the full test-cost stack.

Electronics Manufacturing calculator

Functional Test Cost Calculator

Functional test cost is the fully loaded cost of running powered, end-of-line functional tests on a batch of assemblies, blending per-unit variable cost with labor, setup, and overhead. Quoting engineers and operations managers use it to price test into a job and to decide whether a custom functional tester pays off versus manual benchmarking. It matters because functional test is where fixture, software, and engineering burden hide: the variable per-assembly cost looks small until you spread the fixture and setup cost across the batch. Getting cost per assembly right keeps quotes accurate and exposes when a low-volume job is carrying too much fixed overhead.

What this calculator does

Estimate functional test cost for electronic assemblies from tested units, variable test cost, labor/setup cost, and overhead.
an estimator or test engineer needs a functional test cost for an assembly quote
It totals variable functional test cost across the batch plus labor/setup and fixture/overhead, then divides by the batch to give cost per assembly.

Formula used

Total functional test cost = assemblies functionally tested × variable functional test cost + labor/setup + overhead
Functional test cost per assembly = total functional test cost ÷ assemblies functionally tested

Inputs explained

Assemblies functionally tested:
Variable functional test cost:
Functional test labor or setup cost:
Fixture, software, and overhead cost:

How to use the result

Use it when quoting a job, comparing test approaches, or amortizing fixture and software cost over a production run.
It assumes a single batch and flat per-unit cost; retest loops, scrap, and warranty cost from test escapes are not included.

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 functional test cost? Multiply assemblies tested by the variable cost per assembly, then add labor/setup and fixture/overhead. With 1,200 assemblies at $1.75 plus $360 labor and $240 overhead, total cost is $2,700, or $2.25 per assembly.
What drives cost per assembly in functional test? At low volumes the fixed labor and overhead dominate cost per assembly; at high volumes the variable per-unit cost dominates. Here the $600 of fixed adders spread over 1,200 units adds $0.50 on top of the $1.75 variable, giving $2.25 each.
What is a good functional test cost per assembly? It varies widely by product complexity, but simple boards often test for well under a dollar while complex, long-cycle products run several dollars. Compare against the assembly's sell price; test should be a modest fraction, not a margin sink.
How does batch size change functional test cost? Larger batches dilute the fixed labor and overhead across more units, lowering cost per assembly. Doubling the example batch to 2,400 units would drop cost per assembly toward $2.00 as the $600 fixed cost spreads further.
Should fixture and software cost go in functional test cost? Yes, at least the amortized share for the run, because that burden is real and otherwise hides in overhead. Putting it in the overhead field surfaces it in cost per assembly so quotes reflect true test cost.

Last reviewed 2026-05-12.