How do you calculate labor cost per assembly?

Multiply the run quantity by the labor cost per unit and by the capture factor, then add fixed setup. For 100 assemblies at $45 with an 80% capture factor plus $250 setup, total labor is $3,850, or $38.50 per assembly.

What does the capture factor represent?

It is the share of nominal labor that is genuinely chargeable and value-adding. An 80% factor means 20% of gross labor time is trimmed as non-recoverable idle, walk-time or overlap that you should not fully bill.

Why include a fixed setup cost separately?

Bending, welding and roll-forming setups are incurred once per run regardless of quantity. Folding the $250 setup into the per-unit figure ($2.50 across 100 pieces) is what makes short runs look expensive and long runs cheap.

What is a good labor per assembly for tube fabrication?

There is no universal target; it depends on complexity. A simple single-bend bracket may run $5-$15, while a multi-weld, multi-bend structural assembly like our $38.50 example is normal. Track it against your own historical routers.

Labor per assembly vs. total job cost?

Labor per assembly is only the direct-labor slice. Total job cost also layers in material, consumables like wire and gas, machine burden and margin. Use this figure as the labor input to a full cost roll-up.

How do I lower labor per assembly?

Spread fixed setup over larger runs, raise the capture factor by cutting walk-time and rework, or move repetitive bends to a CNC bender. Halving setup or adding quantity both drop the per-piece number directly.

Tube, Pipe & Profile Forming calculator

Labor Per Assembly Calculator

Labor Per Assembly tells a tube, pipe and profile forming shop exactly how much direct labor is baked into every welded frame, bent handrail or roll-formed section it ships. It blends the variable labor spent on each unit with the fixed setup, first-article and tooling changeover time that a run absorbs, then divides back to a clean per-piece number. Estimators use it to defend quotes against low-ball competitors, and production supervisors use it to spot when a bending or notching cell is bleeding hours. On a fabrication floor where a single mandrel bender setup can eat an hour before the first bend, knowing the true loaded labor per assembly is what separates a profitable job from a break-even one.

What this calculator does

Labor Per Assembly tells a tube, pipe and profile forming shop exactly how much direct labor is baked into every welded frame, bent handrail or roll-formed section it ships.
Use it when labor per assembly in tube, pipe and profile forming is being put through a tube, pipe and profile forming weighted-cost review.
It computes the total direct labor cost for a forming run and the labor dollars carried by each individual assembly.

Formula used

Labor Per Assembly cost = quantity × rate × capture factor + fixed cost
Per-unit labor per assembly = total cost ÷ quantity

Inputs explained

Assemblies produced per run:
Labor cost per assembly:
Direct labor capture factor:
Fixed setup and tooling cost:

How to use the result

Use it when quoting a new tube or profile job, validating a router's standard labor, or comparing manual bending against automated cells.
It treats the capture factor and labor rate as flat across the run, so it will not model learning-curve speedups or a mid-run rate change.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.

Common questions

How do you calculate labor cost per assembly? Multiply the run quantity by the labor cost per unit and by the capture factor, then add fixed setup. For 100 assemblies at $45 with an 80% capture factor plus $250 setup, total labor is $3,850, or $38.50 per assembly.
What does the capture factor represent? It is the share of nominal labor that is genuinely chargeable and value-adding. An 80% factor means 20% of gross labor time is trimmed as non-recoverable idle, walk-time or overlap that you should not fully bill.
Why include a fixed setup cost separately? Bending, welding and roll-forming setups are incurred once per run regardless of quantity. Folding the $250 setup into the per-unit figure ($2.50 across 100 pieces) is what makes short runs look expensive and long runs cheap.
What is a good labor per assembly for tube fabrication? There is no universal target; it depends on complexity. A simple single-bend bracket may run $5-$15, while a multi-weld, multi-bend structural assembly like our $38.50 example is normal. Track it against your own historical routers.
Labor per assembly vs. total job cost? Labor per assembly is only the direct-labor slice. Total job cost also layers in material, consumables like wire and gas, machine burden and margin. Use this figure as the labor input to a full cost roll-up.

Last reviewed 2026-05-12.