ShipCalculators.com

Economic Order Quantity (EOQ)

EOQ = √(2·D·K / h) - order-size that minimises total ordering + holding cost for a spare.

MaintenanceInventory
Loading calculator…

Formula, assumptions, and limits

EOQ=2DKhEOQ = \sqrt{\frac{2 D K}{h}}
SymbolMeaningUnit
DDAnnual demandunits
KKOrder setup costUSD
hhHolding cost per unit per yearUSD

Source: Wilson (1934) - Scientific routine for stock control

In short

EOQ = \u221a(2\u00b7D\u00b7K / h) - order-size that minimises total ordering + holding cost for a spare.

Learn the theory Cylinder Cover Design and Cooling: Two-Stroke Engines