Cost

PCB Assembly Cost Estimation: What Drives Cost Per Board and How to Quote

Where the money actually goes in electronics assembly, from feeder setup amortization to component attrition, and how to build a quote that survives a volume change.

Cost per board splits into four buckets: bare board, components, assembly conversion, and fixed setup amortized over the run. On a mid-complexity board the BOM usually dominates at 55 to 70 percent of unit cost, the bare PCB runs 8 to 15 percent, SMT conversion 10 to 20 percent, and setup plus test the remainder. The single biggest quoting error is treating setup as free. If feeder and stencil setup costs 320 dollars for a job and you run 200 boards, that is 1.60 dollars per board. Run 5,000 and it is 6.4 cents. The PCB Cost Per Board calculator forces this amortization so small runs are not silently subsidized.

The bare board price comes straight from panel utilization, so quote the panel, not the board. If a fabricator charges 210 dollars for a 457 by 610 mm panel and you fit 78 good images at a 96 percent fab yield, board cost is 210 divided by 74.9, or 2.80 dollars each. Push utilization from 67 to 78 percent by re-panelizing and the same panel yields 91 images, dropping bare board cost to 2.40 dollars, a 14 percent material saving before you touch a component. Use PCB Panel Utilization and Boards Per Panel to test layouts before you accept the fabricator's default array.

Components carry hidden cost beyond the line-item BOM price. Attrition adds parts you buy but never ship: reel leaders, setup verification placements, and pick failures. Typical attrition runs 1 to 3 percent on 0402 and smaller passives and can hit 5 percent on fine-pitch parts with tight MSD handling. On a 300-line BOM averaging 8 cents a part across 1,150 placements, a 2 percent attrition rate is roughly 1.84 dollars of scrapped components per board. Estimators who quote the raw BOM and ignore attrition lose that margin on every unit, and it compounds when reels have high minimum-order quantities.

Assembly conversion cost is machine time plus labor, and it is driven by cycle time, not placement count alone. If your loaded SMT line rate is 180 dollars per hour and cycle time is 155 seconds per board, conversion is 180 times 155 divided by 3,600, or 7.75 dollars per board at the bottleneck station. Utilization erodes this: at 68 percent pick-and-place utilization you are paying for 32 percent idle asset time that must be recovered somewhere. Feeder Setup Cost and Feeder Setup Time quantify the changeover portion, which on high-mix jobs can exceed the run time itself and must load onto the quote as a fixed charge.

Solder paste and consumables look small per board but scale with volume and waste. At 3.0 grams deposited per board and 550 grams total draw per shift including stencil loss, paste at 220 dollars per 500-gram jar costs roughly 24 cents per 100 boards in material, but the real cost is stencil life and shift-end scrap. The Solder Paste Usage calculator exposes the waste fraction. Add stencil amortization: a 900-dollar stainless stencil over a 5,000-board program is 18 cents per board, a real number that gets forgotten on prototype and short-run quotes where it can be a dollar or more.

Scrap and rework are where quotes quietly bleed. A board that fails AOI and gets reworked carries the full material cost plus 15 to 40 dollars of technician time depending on the defect. If first-pass yield is 97 percent and rework recovers most boards at 22 dollars each, a 1,000-board run absorbs roughly 660 dollars of rework labor, or 66 cents per board across the run. Boards scrapped outright carry their full loaded cost as pure loss. Build a scrap factor from your real yield history into every quote; assuming 100 percent yield is the most common way estimates come in low and jobs lose money.

Overhead and margin ride on top of fully loaded cost, and the reference basis matters. If loaded cost per board is 14.25 dollars and you want 25 percent gross margin on price, the selling price is 14.25 divided by 0.75, or 19.00 dollars, not 14.25 times 1.25 which only yields 17.81 and a 20 percent margin. Confusing markup with margin is a routine 5-point error. Confirm whether your quote target is margin on price or markup on cost before you send it, because at scale that gap is the difference between a profitable program and a break-even one.

The most defensible quotes state the volume assumption explicitly, because unit cost is a curve, not a point. Setup, stencil, and NRE amortize over quantity, so a price valid at 5,000 units breaks at 250. Quote in tiers: give the customer 250, 1,000, and 5,000 unit pricing with the setup component visible. When demand later drops to a fraction of forecast, you are protected because the tier already priced the fixed-cost recovery. The fastest way an electronics quote goes wrong is a single blended price built on the optimistic volume that then never ships.

Published 2026-07-01.