Leather, Footwear & Accessories Manufacturing worked example

Size Curve Inventory with daily sell-through rate of 13 pairs / day: a worked example

This worked example runs the size curve inventory numbers for a tougher week than the baseline: daily sell-through rate of 13 pairs / day instead of the typical 25 pairs / day. Calculate required inventory levels across your footwear size curve by combining daily sell-through rate, supplier replenishment lead time, and safety stock for demand variability. Ensures adequate coverage for each size without overstocking slow-moving sizes.

The inputs for this scenario

  • Daily sell-through rate: 13 pairs / day (the input this scenario stresses; the baseline uses 25)
  • Replenishment lead time: 75 days (held at the documented default)
  • Size-curve safety stock buffer: 200 pairs (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Cycle stock = daily sell-through rate x replenishment lead time.
  • Protected days of supply works out to 0 days at these inputs, and this is the headline figure for the scenario.
  • Unprotected days works out to 0.17 days at these inputs.
  • Inventory works out to 13 pieces at these inputs.
  • Daily usage works out to 75 pieces / day at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where daily sell-through rate sits at 25 pairs / day and the headline result is 0 days, this scenario comes in 48% below the baseline at 0 days.
  • Use it when setting replenishment targets or reorder points for a footwear size curve or a single key size. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Protected days of supply: 0 days (headline result)
  • Unprotected days: 0.17 days
  • Inventory: 13 pieces
  • Daily usage: 75 pieces / day

Run it with your numbers

  • To rerun this with your own numbers, open the live Size Curve Inventory calculator, set daily sell-through rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.