Why is piece count the driver rather than area or weight?

Because the work is handling, and handling is per piece. Picking up a one-square-foot patch and a ten-square-foot one takes almost the same time: the large one is arguably faster, since it is easier to locate. Area drives material cost and weight drives freight, but neither predicts assembly labor. A seven-piece assembly and a one-piece assembly with the same total area have wildly different labor and identical material.

How much can consolidation really save?

The saving figure on this page, multiplied by the pieces removed, on every batch for the life of the part. Going from seven pieces to four on a sixty-unit batch at six minutes and a $58 rate saves just over a thousand dollars per batch, with no material change. On a part running monthly that is a five-figure annual saving from a drawing change, which is why it is worth raising before tooling is cut rather than after.

Should setup time be inside the per-piece figure?

It is simplest there, and acceptable when setup is small. Where setup is large it distorts the consolidation case, because setup does not fall when pieces are combined while handling does. If setup is a significant share, price it separately and treat the figures here as the variable part; otherwise the page will overstate what consolidation buys.

Does this work for automated assembly?

Not well. An automated cell has a cycle time largely independent of piece count within its capacity, and a large fixed cost that this page has no input for. The per-piece model describes manual assembly, which is what most acoustic product work still is because the parts are compliant, adhesive-backed and awkward for grippers. For a mixed cell, model the manual pieces here and treat the automated portion separately.

Why is there no learning curve?

Because it would need a curve exponent and a cumulative-volume input, which is two more inputs for an effect most quoting does not model. The practical consequence is worth knowing: the first batch of a new acoustic assembly typically runs well above the steady-state time here, sometimes by half again, and quoting the steady-state figure for a first batch is a common way to lose money on a launch.

Are fasteners really worth counting?

Yes, and they are the pieces most often left out. A screw or clip takes as long to pick and position as a foam block, sometimes longer because it needs alignment and a tool. An assembly with twelve fasteners and four acoustic pieces is a sixteen-piece assembly for costing purposes, and the fasteners are frequently the cheaper thing to design out.

Acoustic, Noise, Vibration & NVH Products calculator

Acoustic Assembly Labor Cost Calculator (Part Count)

Cost the labor in an acoustic assembly from what actually drives it: the number of separate pieces somebody picks up. Enter the assemblies in the batch, the pieces in each one, the average handling time per piece and the burdened labor rate. The calculator returns the batch labor cost, the hours behind it, the cost per assembly and per piece, and what removing a single piece from the design would save across the batch. Acoustic assembly is handling work. Pick, position, press, check, and the piece count predicts it far better than area, weight or anything else on the drawing.

What this calculator does

Cost acoustic assembly labor from the thing that drives it. How many separate pieces get handled, and price what removing one of them is worth.
Use it for pricing an acoustic assembly for quote, putting a number on part consolidation before a design review, comparing a supplier's pre-assembled kit against building from loose pieces, understanding why two assemblies with identical material cost quote very differently, estimating the labor effect of adding a piece late in a design.
Cost acoustic assembly labor from the thing that drives it. How many separate pieces get handled, and price what removing one of them is worth.

Formula used

Pieces handled = assemblies in the batch × pieces per assembly
Labor hours = pieces handled × handling time per piece ÷ 60
Batch labor cost = labor hours × burdened rate
Labor cost per assembly = batch labor cost ÷ assemblies
Labor cost per piece = batch labor cost ÷ pieces handled
Saving per piece designed out = assemblies × handling time ÷ 60 × burdened rate

Inputs explained

Assemblies in the batch: How many finished acoustic assemblies the run produces.
Pieces per assembly: Separate pieces placed by hand: each die-cut patch, foam block, barrier septum, bracket and fastener. Count pieces handled, not part numbers.
Handling time per piece: Pick, position, press and check for one piece, averaged. Include the share of jig setup and final inspection each piece carries.
Burdened labor rate: Fully burdened rate: wages, benefits, and the overhead the plant allocates.

How to use the result

Best suited to pricing an acoustic assembly for quote, putting a number on part consolidation before a design review, comparing a supplier's pre-assembled kit against building from loose pieces, understanding why two assemblies with identical material cost quote very differently, estimating the labor effect of adding a piece late in a design.
Labor only. Material, adhesive, tooling and freight are elsewhere. Does not model cure or dwell time, which does not fall when pieces are combined and so weakens the consolidation case where it dominates. Ignores the learning curve, which on a new part can make the first batch substantially more expensive than this predicts. Assumes manual assembly throughout. An automated or semi-automated cell has a different cost structure entirely. Says nothing about whether consolidating pieces is acoustically acceptable. A single large patch is not always equivalent to several placed ones.

Current U.S. benchmarks

As of Jul 2026, average hourly earnings in U.S. manufacturing are $30.35 (BLS), up 4.2% from a year earlier. Burdened shop rates typically run 1.3 to 1.8 times earnings once benefits and overhead are loaded.

Common questions

Why is piece count the driver rather than area or weight? Because the work is handling, and handling is per piece. Picking up a one-square-foot patch and a ten-square-foot one takes almost the same time: the large one is arguably faster, since it is easier to locate. Area drives material cost and weight drives freight, but neither predicts assembly labor. A seven-piece assembly and a one-piece assembly with the same total area have wildly different labor and identical material.
How much can consolidation really save? The saving figure on this page, multiplied by the pieces removed, on every batch for the life of the part. Going from seven pieces to four on a sixty-unit batch at six minutes and a $58 rate saves just over a thousand dollars per batch, with no material change. On a part running monthly that is a five-figure annual saving from a drawing change, which is why it is worth raising before tooling is cut rather than after.
Should setup time be inside the per-piece figure? It is simplest there, and acceptable when setup is small. Where setup is large it distorts the consolidation case, because setup does not fall when pieces are combined while handling does. If setup is a significant share, price it separately and treat the figures here as the variable part; otherwise the page will overstate what consolidation buys.
Does this work for automated assembly? Not well. An automated cell has a cycle time largely independent of piece count within its capacity, and a large fixed cost that this page has no input for. The per-piece model describes manual assembly, which is what most acoustic product work still is because the parts are compliant, adhesive-backed and awkward for grippers. For a mixed cell, model the manual pieces here and treat the automated portion separately.
Why is there no learning curve? Because it would need a curve exponent and a cumulative-volume input, which is two more inputs for an effect most quoting does not model. The practical consequence is worth knowing: the first batch of a new acoustic assembly typically runs well above the steady-state time here, sometimes by half again, and quoting the steady-state figure for a first batch is a common way to lose money on a launch.

Last reviewed 2026-08-25.