basic

Reorder Point with Safety Stock Calculator

ROP = d̄·LT + z·σ_d·√LT — when to reorder.

Calculates the reorder point ROP = average demand per day × lead time days + safety stock. Safety stock = z × σ_demand × √lead_time for a given service level (z-score).

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

units/day
days
units

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ROP = d̄·LT + z·σ_d·√LT

In depth

Calculates the reorder point ROP = average demand per day × lead time days + safety stock. Safety stock = z × σ_demand × √lead_time for a given service level (z-score).