Reorder point & EOQ calculator
Standard inventory formulas: safety stock = z × √(L·σd² + d²·σL²), reorder point = d × L + safety stock, EOQ = √(2DS/H).
Result
The URL updates as you type, so you can bookmark or share a scenario.
This tool uses only the numbers you enter; no third-party fee data is built in.
FAQ
What is a reorder point?
The stock level at which you place the next purchase order so new stock arrives before you run out: expected demand during the lead time plus safety stock.
How much safety stock do I need?
It depends on how much demand and lead time vary and how rarely you accept a stock-out. Higher service levels raise z and therefore safety stock steeply.
Does EOQ work for Amazon FBA?
As a starting point. FBA capacity limits, storage fees and the aged inventory surcharge raise the real holding cost, so enter a higher holding % or check the storage calculator.