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Reorder point and inventory replenishment calculator

Calculate replenishment for one SKU. Separate physical stock, reserved units and confirmed inbound stock to review when to reorder. The tool does not connect to your store or place a purchase.

Enter your scenario

Editable example. Calculations run in this browser. Blank optional fields stay unknown; enter 0 explicitly when there is no cost.

Average future demand (units/day)Your projection, excluding orders already counted as reserved.Replenishment lead time (days)From purchase placement to usable stock.Additional coverage period (days)Additional horizon used to calculate the replenishment target.Safety stock (units)Your chosen buffer; no statistical service level is inferred.Usable physical stock (units)Include your safety buffer; exclude damaged or unusable goods.Units already reservedUnshipped commitments. They may exceed physical stock.Confirmed timely inbound (units)Only units usable within the lead time. A delay changes the scenario.

Scenario calculation

Review replenishment

Net free physical stock: 70
Inventory position: 70
Reorder point (units): 90
Coverage target (units): 230
Indicative order when the point is reached: 160
Free physical stock coverage: 7 days

Arithmetic based on your assumptions. No store connection, booking, carrier quotation, purchase or guaranteed saving. No personal details are needed.

How the calculation works

Reorder point = daily demand × lead time + safety stock, rounded up to whole units. Inventory position is usable physical stock − reservations + confirmed timely inbound.

If position is at or below the reorder point, the indicative quantity fills the target: demand × (lead time + additional coverage) + safety stock. Above the point, suggested quantity is zero. Coverage uses free physical stock, excluding goods still in transit.

How to interpret the result

The model assumes constant demand and lead time. It does not optimize purchase minimums, case multiples, campaigns, expiry, financing or supplier variability.

With zero demand, coverage days are undefined. Confirmed inbound can improve position without preventing a stockout before arrival: check its timing.

Reference: Shopify · fundamentos de inventario

Argo Hub provides ecommerce fulfillment from Gójar, Granada. Use this scenario to prepare the review of your actual operation.

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