What is fill rate and how is it calculated?
Fill rate is the share of ordered units that actually shipped, calculated as units shipped divided by units ordered. It can be measured by unit, by line, or by whole order, and the three give different numbers for the same shipment. Retailers usually specify which definition their scorecard uses.
Line fill and unit fill diverge sharply on multi-line orders. Shipping 95% of the units can mean missing a line entirely, and a retailer scoring by line will read that as a worse result than the unit number suggests.
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