How do you calculate inverter assembly cost?

Multiply the number of assemblies by the per-assembly cost and by the build-volume capture rate to get variable cost, then add the fixed program adder. With 100 assemblies at $45, 80% capture, and a $250 adder, variable cost is $3,600 and total is $3,850.

Why is my per-unit cost higher than the per-assembly cost?

The per-unit figure spreads the fixed program adder across the units. Here $3,850 total over 100 units is $38.50 each — below the $45 nominal only because capture is 80%, which reduces the variable base before the fixed adder is layered back on.

What does build volume captured mean?

It is the share of planned assemblies you actually cost into this run — useful when a portion of volume is carried by another site, a consignment arrangement, or a phased ramp. At 80% you cost 80 units of variable effort while still carrying the full $250 fixed adder.

Should the fixed adder include NRE and fixturing?

Yes — the adder is the right home for one-time program costs like test fixtures, ICT programming, and line changeover that do not scale with unit count. Keeping them separate from the $45 per-assembly cost prevents them from distorting your marginal cost.

Inverter assembly cost vs standard cost — what's the difference?

Standard cost is a frozen accounting figure; this calculator gives you a build-specific estimate that reflects the actual capture rate and program overhead for a given run, which is what you want when quoting or comparing sites.

What is a good per-unit inverter assembly cost?

It depends entirely on power class, but for a mid-power traction or industrial inverter, $30-$60 of assembly cost per unit (excluding the IGBT/SiC modules and passives) is a realistic touch-and-test range on an automated line.

Power Electronics, Motors & Drives calculator

Inverter Assembly Cost Calculator

Inverter Assembly Cost estimates what it actually costs to build a batch of power inverters once you account for the labor and material burden per assembly, how much of the planned build volume you are truly capturing, and any fixed program overhead. Cost engineers, drive OEM operations managers, and contract manufacturers use it to quote motor-drive programs and to sanity-check standard costs against real touch time on the SMT and final-assembly lines. Because inverter builds mix high-value IGBT/SiC power stages with lower-cost gate-drive and control boards, a blended per-assembly figure plus a fixed adder captures program economics better than a flat piece price. It matters most when you are deciding whether a build volume is profitable or when NRE and fixturing need to be amortized across a run.

What this calculator does

Estimate inverter assembly cost from build volume, per-unit labor or material cost, the share of units in scope, and any fixed launch or validation adder.
Use it when quoting traction inverters, industrial drives, VFD panels, DC-AC inverter assemblies, or converter subassemblies and you need a quick total cost view.
It computes total inverter assembly cost as capture-adjusted variable cost per unit times the unit count, plus a fixed program adder, and also returns cost per unit.

Formula used

Variable inverter assembly cost = inverter assemblies in scope × assembly cost per inverter × build volume captured
Total inverter assembly cost = variable inverter assembly cost + fixed inverter program adder

Inputs explained

Inverter assemblies in scope:
Assembly cost per inverter:
Build volume captured:
Fixed inverter program adder:

How to use the result

Use it when quoting an inverter build, setting standard cost for a drive program, or evaluating whether a partial-capture volume covers its fixed overhead.
The single blended per-assembly cost hides mix effects — a batch heavy in high-power SiC stages will run well above the average, so validate the blend against your actual BOM split.

Current U.S. benchmarks

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Common questions

How do you calculate inverter assembly cost? Multiply the number of assemblies by the per-assembly cost and by the build-volume capture rate to get variable cost, then add the fixed program adder. With 100 assemblies at $45, 80% capture, and a $250 adder, variable cost is $3,600 and total is $3,850.
Why is my per-unit cost higher than the per-assembly cost? The per-unit figure spreads the fixed program adder across the units. Here $3,850 total over 100 units is $38.50 each — below the $45 nominal only because capture is 80%, which reduces the variable base before the fixed adder is layered back on.
What does build volume captured mean? It is the share of planned assemblies you actually cost into this run — useful when a portion of volume is carried by another site, a consignment arrangement, or a phased ramp. At 80% you cost 80 units of variable effort while still carrying the full $250 fixed adder.
Should the fixed adder include NRE and fixturing? Yes — the adder is the right home for one-time program costs like test fixtures, ICT programming, and line changeover that do not scale with unit count. Keeping them separate from the $45 per-assembly cost prevents them from distorting your marginal cost.
Inverter assembly cost vs standard cost — what's the difference? Standard cost is a frozen accounting figure; this calculator gives you a build-specific estimate that reflects the actual capture rate and program overhead for a given run, which is what you want when quoting or comparing sites.

Last reviewed 2026-05-12.