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Restock Lead-Time Calculator

In one line: Pinpoint the last day you can reorder without running out — across the long production-plus-ocean-freight lead time.

When to use

  • Planning replenishment for a product shipped by sea
  • Avoiding stockouts during the multi-week cross-border pipeline
  • Sizing a purchase order so cash isn't tied up in excess stock

Inputs

Field Notes
Average daily sales Units sold per day (recent trailing average)
Current stock On-hand and inbound-available units
Production lead time Days to manufacture after the PO is placed
Sea-freight transit Days in ocean transit plus port handling
Safety-stock days Buffer days to absorb demand spikes and delays

Outputs

  • Latest reorder date: the last day to place the PO without a stockout
  • Projected stockout date: when current stock runs to zero at current velocity
  • Recommended order quantity: units to cover the next cycle plus safety stock

Steps

  1. Open https://www.niceggie.com/tools/restock-planner
  2. Enter average daily sales and current stock
  3. Add production lead time, sea-freight transit, and safety-stock days
  4. Read the latest reorder date and set a calendar reminder ahead of it

Total lead time is the real deadline

Your reorder clock is production + freight + safety stock, not just shipping. A 30-day build plus 35-day ocean transit plus a 14-day buffer means you must reorder roughly 79 days of stock before you hit zero — miss that window and no expediting fully recovers it.

FAQ

What if my daily sales are seasonal or trending up?

Use a forward-looking estimate rather than a flat trailing average for fast-growing or seasonal SKUs. Re-run the calculator whenever velocity shifts, and lean on a larger safety-stock buffer when demand is volatile.

Should I include air freight as a fallback?

The calculator models the sea-freight cycle. If you miss the reorder window, air freight can bridge the gap at higher cost — treat it as emergency recovery, not a planning baseline.

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