Calculations

How to Calculate Machine Build Cost, Engineering Hours, and FAT Workload for Capital Equipment

The core capital-equipment formulas worked end to end: build cost, engineering hours, assembly labor load, and FAT/SAT workload, with real inputs and units.

Machine build cost starts as a bill of materials roll-up plus conversion labor: Build Cost = Bought Parts + Fabricated Parts + Assembly Labor Hours times Loaded Rate. For a mid-size automation cell, say bought parts (drives, PLC, servos, pneumatics) run 42,000 dollars, fabricated steel and machined parts 18,500 dollars, and assembly takes 320 hours at a loaded 78 dollars per hour, that labor is 24,960 dollars. Total direct build cost is 85,460 dollars. Keep bought parts and fabricated parts in separate lines because their markup and lead times differ. The Machine Build Cost calculator carries these lines so you avoid burying purchased assemblies inside a single lump number.

Engineering hours per machine is the input most estimators guess. Split it by discipline: mechanical design, electrical/controls, and software. A repeat build off an existing platform runs 180 to 260 total engineering hours; a first-of-kind custom machine runs 600 to 1,200. Compute it as Base Platform Hours plus Custom Content Percent times Base. If your platform baseline is 220 hours and the job is 35 percent new content, that is 220 plus 0.35 times 220, which equals 297 hours. The Engineering Hours per Machine calculator lets you weight each discipline so controls-heavy jobs do not inherit a mechanical-heavy baseline.

Assembly labor load converts a station count and cycle content into staffed hours. Use Assembly Hours = Sum of Task Times times Quantity divided by Assembly Efficiency. If mechanical fit-up is 140 hours, wiring 90 hours, and plumbing 40 hours, raw content is 270 hours. Real shops hit 70 to 85 percent efficiency on first builds because of rework and part fit, so at 80 percent efficiency you plan 270 divided by 0.80, which equals 337.5 hours. The Assembly Labor Load calculator applies that efficiency factor and spreads the hours across your crew so you can see calendar weeks, not just an hour bucket.

Commissioning and field install are separate from build. Commissioning Cost = (Debug Hours plus Runoff Hours) times Loaded Rate plus Consumables. A machine needing 120 debug hours and 40 runoff hours at 85 dollars per hour is 13,600 dollars in labor, plus roughly 1,500 dollars of test material and consumables, so 15,100 dollars. Field Install Cost adds travel, per diem, and rigging: 2 techs for 8 days at 950 dollars per day loaded, plus 3,200 dollars travel and 4,500 dollars rigging is 22,900 dollars. The Commissioning Cost and Field Install Cost calculators keep these off the build sheet so on-site variance does not corrupt your shop cost.

FAT and SAT workload are hour estimates for acceptance testing, and they are routinely under-scoped. FAT Workload = Test Points times Minutes per Point divided by 60 plus Fixed Setup Hours. A machine with 180 test points at 12 minutes each is 36 hours, plus 16 hours of setup and paperwork, so 52 hours of Factory Acceptance Test effort. SAT (Site Acceptance Test) usually runs 40 to 60 percent of FAT because the machine already ran once, so plan 21 to 31 hours. The FAT Workload and SAT Workload calculators separate test-point time from fixed overhead so adding scope updates the number correctly.

Machine backlog value ties individual builds to a portfolio number your operations team can schedule against. Backlog Value = Sum of (Contract Price times Percent Not Yet Recognized) across open orders. If you hold 14 machines averaging 240,000 dollars and, on average, 55 percent of the work remains, backlog is 14 times 240,000 times 0.55, which equals 1.848 million dollars of unearned value. The Machine Backlog Value calculator rolls this per order and lets you weight by stage so a machine at FAT counts less remaining work than one still in engineering.

Warranty reserve is a forward accrual, not an afterthought. Reserve = Selling Price times Expected Warranty Cost Percent, calibrated from history. Capital machinery typically reserves 1.5 to 4 percent of price; complex first-of-kind builds run 5 to 8 percent. On a 240,000 dollar machine at a 3 percent reserve, you set aside 7,200 dollars per unit. Across the 14-machine backlog above, that is roughly 100,800 dollars. The Warranty Reserve calculator lets you set different rates for repeat platforms versus custom builds so your accrual matches actual claim experience rather than a single blended guess.

Chain the numbers to get a defensible total. Build 85,460 plus engineering 297 hours at 95 dollars (28,215), plus assembly already inside build, plus commissioning 15,100, plus FAT 52 hours at 85 (4,420), plus field install 22,900, plus warranty reserve 7,200 gives roughly 163,295 dollars of loaded cost before margin. Every input traces to a source: BOM from purchasing, hours from your discipline leads, rates from finance, and test points from the acceptance spec. Run each piece in its own calculator, then sum, so a change in one input does not force you to rebuild the whole estimate.

Published 2026-07-01.