Leather, Footwear & Accessories Manufacturing worked example

Stitching Labor per Pair at 17% allowance for fatigue and changeovers: a worked example

What does the result look like when allowance for fatigue and changeovers reaches 17%? The full calculation is worked below with real intermediate numbers. Use this when planning stitching line capacity for a new order, estimating labor cost per pair, scheduling overtime, or comparing SMV across shoe styles.

The inputs for this scenario

  • Pairs of uppers in the batch: 500 pairs (unchanged)
  • Stitching station output rate: 5 pairs / hr (unchanged)
  • Allowance for fatigue and changeovers: 17 % (raised for this scenario; the documented default is 15)

Working through the calculation

  • Applying the documented formula (Base stitching time = pairs in batch / stitching rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 117 hr for required stitching time (with allowances), the number this scenario is built around.
  • At this operating point the engine returns 100 hr for base stitching time.
  • At this operating point the engine returns 17 % for delay allowance applied.
  • At this operating point the engine returns 5 pieces / min for stitching rate (pairs/hr).

How this compares with the baseline

  • Against the tool's baseline example, where allowance for fatigue and changeovers sits at 15% and the headline result is 115 hr, this scenario comes in 1.74% above the baseline at 117 hr.
  • A figure at this level is achievable when allowance for fatigue and changeovers is genuinely sustained, not just peaked for a shift. A single flat allowance cannot model a complex upper with many seams differently from a simple one, so set the allowance per style rather than reusing one number.

Results at a glance

  • Required stitching time (with allowances): 117 hr (headline result)
  • Base stitching time: 100 hr
  • Delay allowance applied: 17 %
  • Stitching rate (pairs/hr): 5 pieces / min

Run it with your numbers

  • Every input above is editable in the live Stitching Labor per Pair calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.