Fill Rate Calculator

For DTC stores, 95–98% is the standard band. Chasing 100% is usually uneconomic — the safety stock needed to cover every possible demand spike costs more than the last few missed orders. Wholesale is stricter: big retail buyers often write 98%+ fill rates into vendor agreements with chargebacks for misses, so B2B sellers should treat this as a contract metric, not a vanity one.

Order fill rate (this calculator) counts an order as filled only if every item shipped — the customer’s experience. Line fill rate scores each order line separately, and unit fill rate counts individual units, so both read higher than order fill on multi-item orders. A warehouse can boast 97% unit fill while a third of multi-item orders ship incomplete. Track order fill for customer experience.

More than the unfilled orders. Industry studies consistently find that roughly a quarter to a third of shoppers facing a stockout buy from a competitor immediately, and repeated stockouts train even loyal customers to check elsewhere first. On marketplaces the damage compounds: out-of-stock listings lose ranking and ad momentum that can take weeks of full-price selling to rebuild.

Diagnose which SKUs drive the misses — fill rate failures usually concentrate in a handful of fast movers. Then fix the mechanism: raise safety stock and reorder points on those SKUs, shorten lead times with a domestic or backup supplier, and set low-stock alerts at the reorder point rather than at zero. Measure weekly; a chronically low rate is a planning problem, not a warehouse problem.