Electronics Manufacturing calculator

SMT Line Throughput Calculator

This calculator turns completed SMT board counts into an hourly throughput number that reflects actual uptime and process performance. It is useful for EMS planners and production managers who need to promise board output without relying on ideal machine speed.

What this calculator does

  • Estimate good PCB assembly throughput from completed boards, runtime, and SMT line efficiency.
  • a planner needs an honest boards-per-hour rate for an SMT family before committing capacity
  • Shows the effective good-board output rate for the SMT line in boards per hour.

Formula used

  • Observed SMT board rate = good SMT boards completed ÷ SMT line runtime
  • Effective SMT board throughput = observed SMT board rate × SMT performance efficiency

Inputs explained

  • Good SMT boards completed: Count boards that cleared SMT, reflow, and immediate post-SMT disposition for the same period.
  • SMT line runtime: Use net runtime for the same board count, excluding planned shutdowns if they were not available.
  • SMT performance efficiency: Use measured efficiency for this product family, including minor stops and speed loss.

How to use the result

  • Use it for capacity reviews, daily schedule checks, customer commits, and make-versus-outsource decisions.
  • It does not include downstream AOI, ICT, conformal coating, depanel, packing, or material shortage effects unless those losses are included in the efficiency input.

Common questions

  • What does the smt line throughput calculator tell me? It reports good boards per hour after applying an efficiency factor to actual completed board output.
  • Which numbers should I enter? Use completed board count, matching runtime hours, and an efficiency factor from the same product mix and shift pattern.
  • How should I use the result? Use the rate to size shifts, check demand coverage, and identify whether placement, reflow, AOI, or test is likely to become the bottleneck.
  • When is this only an estimate? Treat it as a planning estimate when product mix, setup time, operator assist time, feeder readiness, inspection disposition, test escapes, scrap, or supplier yield differs from the data used for the inputs.

Last reviewed 2026-05-12.