Sheet Metal Fabrication Cost: What Drives the Price (Worked Example)

Most pages about sheet metal fabrication cost are written for buyers. They either push you to an instant-quote upload box or list cost categories with no numbers attached. This guide is written for the person pricing the job: the estimator or owner who has a drawing on screen and needs a number that will hold up on the shop floor. Buyers will find it useful too, because it shows exactly why a part costs what it does.

Short answer: the cost of a sheet metal part is the material it uses (including the scrap around it), the machine and labor time for each operation (cutting, bending, hardware, welding, finishing), plus one-off setup and programming spread over the quantity, plus outside processing and its minimum lot charges. Measure each driver from the drawing, multiply by your own rates, and add them up per quantity break.

What determines sheet metal fabrication cost?

There are about ten cost drivers, and each one has a measurable input on the print. The table below is the checklist. If you cannot find the input on the drawing, that is a question for the customer before you quote, not a guess.

Material: blank size, nesting yield, gauge, grade and scrap

Start from the flat blank, not the formed part. Most drawings show a flat pattern; if not, add the flange lengths and subtract bend deductions. Blank weight is length x width x thickness x density (0.284 lb per cubic inch for steel, about 0.098 for aluminum). Then divide by nest yield, the share of the sheet that ends up as parts. A rectangular blank might nest at 80% on a 48 x 120 in sheet; an L-shaped part might only reach 60%. Gauge and grade set the price per pound: stainless and aluminum cost several times more per pound than mild steel, and thicker material also cuts slower.

How much does laser cutting cost?

Laser cutting cost is run time multiplied by the machine's hourly rate. Run time comes from three things you can measure on the drawing: total cut length (outer profile plus every hole and cutout), pierce count (one per closed contour), and travel and sheet handling between cuts. Pierces matter more than people expect: a part with forty small holes can take longer than a larger part with a simple outline. Thicker or harder material lowers the cut speed and lengthens pierce time.

Cut minutes = cut length (in) / cut speed (in per min)
Pierce minutes = pierce count x seconds per pierce / 60
Laser run minutes = cut + pierce + travel and sheet handling share
Laser cost per part = run minutes x (machine rate per hour / 60)

Forming: bend count, setups and tooling changes

Press brake cost has two parts. Run time scales with bend count: each bend means positioning the part, cycling the ram and flipping or rotating for the next. Setup scales with the number of different tool setups: a part that needs a gooseneck punch for one flange and a standard punch for the rest may need two setups, or a staged setup that takes longer to build. Count bends from the flat pattern bend lines or the formed views, and note any bend that is close to a hole or another flange, because those slow the operator down.

Hardware, welding, finishing and outside processing

Hardware is easy to count and easy to miss: look for the hardware table or the callouts on the face views. Price the hardware itself plus a few seconds per insert. Welding has its own method (fit-up, tack, weld, grind); see how to price welding jobs. Finishing is usually outside processing, so you pay the vendor's price per part plus their minimum lot charge, plus freight or a truck run. On small orders the minimum often costs more than all the in-house work.

Inspection, packaging and setup amortized over quantity

Tight tolerances add inspection time: a first article inspection per lot and some check time per part. Packaging is small per part but adds up on volume orders. Finally, every one-off cost (CAM programming, laser setup, brake setup, insertion setup, first article) is divided by the order quantity. That single division is why the per-part price falls so steeply between qty 10 and qty 100.

Worked example: what does a 14-gauge steel bracket cost to make?

Here is a complete costing for an invented part. All rates and times are example figures; use your own shop rates (see the shop rate calculator) and labor standards.

• Part: U-channel mounting bracket with two side flanges and two mounting tabs.
• Material: 14 gauge (0.075 in, 1.9 mm) cold rolled mild steel at $0.65 per lb.
• Flat blank: 10.00 x 6.00 in. Weight: 10 x 6 x 0.075 x 0.2836 = 1.28 lb.
• Nest: 77 parts per 48 x 120 in sheet (11 x 7 with 0.25 in spacing), 80% yield.
• Features: 4 holes at 0.166 in for 10-32 self-clinching nuts, 2 mounting holes at 0.406 in, one 2.00 x 1.00 in cutout.
• Cut length: outer profile 32.00 in + 4 small holes 2.09 in + 2 mounting holes 2.55 in + cutout 6.00 in = 42.6 in.
• Pierces: 8 (one outer profile, six holes, one cutout).
• Forming: 4 bends at 90 degrees, one tool setup.
• Hardware: 4 steel self-clinching nuts (PEM-style), inserted before coating with threads masked.
• Finish: black powder coat by an outside vendor at $1.80 per part, $150 minimum lot charge, $40 round-trip freight.

Per part, the in-house variable costs add up to exactly $5.00. Fixed costs per lot are $220.50 ($42.50 programming, $45 laser setup, $45 brake setup, $18 insertion setup, $30 first article, $40 coating freight). Powder coat is $1.80 per part but never less than $150 per lot.

One judgment call: at qty 10 the order uses about one eighth of a sheet. This example charges material at nest yield, which assumes the remnant gets used. If remnants of this gauge sit on your rack for months, charge a larger share of the sheet on small lots.

Which design and drawing changes move the price most?

Using the same example at qty 100, here is how single changes move the cost per part (before markup). Use this kind of sensitivity check when a customer asks how to bring the price down.

Why do sheet metal quotes come out wrong?

When a job loses money, the rates are rarely the problem. The problem is something on the drawing that never made it into the estimate. The usual suspects:

• Missing bend count. Bends hidden in a section view, a hem or a jog counted as one bend instead of two, or a second setup nobody spotted.
• Tolerance notes. A title block tolerance of plus or minus 0.005 in on a formed dimension means slower bending, more first-piece adjustment and more inspection.
• Finish notes. Masking requirements, a specific color or texture, or a coating thickness spec that changes the vendor's price.
• Outside-processing minimum lot charges. A $150 coating minimum on a 10-piece order adds $15 a part. Plating, anodizing and heat treat vendors all have minimums.
• Hardware in notes, not on views. Hardware called out only in a general note or a separate BOM gets missed.
• Revision mismatch. The quote is built from revision B while the RFQ email refers to revision C with an added flange.

How do you build a sheet metal quote step by step?

1. 1

   Read the whole RFQ package

   Check part number, revision, material, gauge, finish and quantities on every drawing, and compare them with the email, the BOM and any specs. Note conflicts and ask before quoting.

2. 2

   Measure the drivers

   From the flat pattern and views, record blank size, cut length, pierce count, bend count and setups, hardware count, weld length and finish area.

3. 3

   Route the part

   List the operations in order (laser, deburr, insert, brake, weld, finish, inspect, pack) and the work center for each. See routing in manufacturing.

4. 4

   Apply your standards and rates

   Turn each measurement into time with your labor standards and into cost with your work-center rates. Keep these in one place so every estimator uses the same numbers (labor standards and rate cards).

5. 5

   Add outside processing with minimums

   Use real vendor prices, apply each vendor's minimum per lot, and add freight.

6. 6

   Price each quantity break and review

   Spread fixed costs over each quantity, apply markup, and sanity-check the per-part price against similar past jobs before the quote goes out.

This is the method Customiser automates. It reads the drawing for cut features, bends, hardware and finish, flags conflicts between documents, routes the part through your own processes and costs it with your own rates, and shows cost, sell price and margin per quantity. Every figure links back to the drawing it came from, and the estimator approves the price before the quote goes out.