Guides

Inventory planning, without the jargon

• Reorder point formula: how to calculate when to reorder

  The reorder point formula with worked examples, the mistakes that make it wrong, and how to handle lead time, incoming stock and stockouts.

• Safety stock formula: three methods and when to use each

  How to calculate safety stock with the max-minus-average method, the service-level method, and a method that includes supplier lead-time variability.

• Stocky is gone: what to use for Shopify reorder planning

  Shopify retired Stocky on August 31, 2026. What Stocky did, what Shopify offers natively now, and how to replace forecasting and purchase-order planning.

• Shopify inventory forecasting: a method you can check by hand

  How to forecast daily demand for each Shopify product: clean the sales history, weight recent weeks, handle seasonality, new products and spikes, and measure accuracy.

• How to prevent stockouts in a Shopify store: a weekly routine

  Why stockouts happen, the early-warning number to watch (days of cover vs lead time), and a 20-minute weekly routine that catches problems while there's still time to reorder.

• Shopify purchase orders: how much to order and what to track

  How to decide purchase order quantities per supplier, round to MOQs and case packs, track expected arrival, and use received dates to measure real supplier lead times.