Electronics Manufacturing calculator

SMT Cycle Time Calculator

Cycle time is the bridge between the CAD placement count and the line schedule. This calculator helps SMT engineers translate placements and measured placement speed into a practical seconds-per-cycle estimate with allowance for fiducials, board handling, and small stops.

What this calculator does

  • Estimate placement cycle seconds per board or panel from placement count, machine placement rate, and setup/handling allowance.
  • an SMT engineer is estimating cycle time for a new PCB assembly before the first production run
  • Returns estimated seconds required for the placement cycle being modeled.

Formula used

  • Placement-only cycle time = placements per SMT cycle ÷ achieved placement speed
  • Estimated SMT cycle time = placement-only cycle time × allowance factor

Inputs explained

  • Placements per SMT cycle: Use placements on one board if timing a single board, or all placements on one panel if timing panel flow.
  • Achieved placement speed: Use measured speed from the line or a similar assembly, not advertised maximum CPH.
  • Board handling and minor-stop allowance: Add allowance for fiducial finding, conveyors, nozzle changes, feeder picks, and normal micro-stops.

How to use the result

  • Use it when comparing new assemblies, checking takt fit, or estimating whether a machine program will starve or block adjacent process steps.
  • It assumes placement rate is steady and does not separately model feeder setup, paste printing, reflow dwell, AOI review, or operator intervention.

Common questions

  • What does the smt cycle time calculator tell me? It estimates placement cycle seconds after adding a practical allowance to placement-only time.
  • Which numbers should I enter? Enter placement count from CAD/BOM, actual placement speed from the line, and a handling allowance based on recent similar jobs.
  • How should I use the result? Use the result to compare against takt, balance lines, schedule machine time, and flag assemblies that need a second line or program optimization.
  • 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.