Safety Stock & Reorder Point Calculator
Know exactly when to place your next purchase order: safety stock for demand swings, and the stock level at which to reorder so you never run out.
Your numbers
How much daily sales typically swing
From placing an order to stock being sellable
Results
Reorder point
353 units
Reorder in about 7.4 days at your current sales rate.
- Safety stock
- 33 units
- Demand during lead time
- 320 units
- Reorder point
- 353 units
- Days of stock on hand
- 25 days
- Service level factor (Z)
- 1.65
Download your results
Branded KleverKlimb report with your inputs and results.
The formula
Exactly what this calculator does with your numbers — no hidden assumptions.
Safety stock
Safety stock = Z × daily sales variation × √lead time. Z is 1.65 for a 95% chance of not running out during the lead time.
Lead-time demand
Average daily sales × lead time in days — what you will sell while waiting for the new stock.
Reorder point
Reorder point = lead-time demand + safety stock. When stock falls to this level, place your next order.
Safety Stock and Reorder Point: When to Reorder Inventory
5-minute guide · How to calculate safety stock and your reorder point from daily sales, sales variation and lead time — so you reorder before you run out.
Questions, answered
Q1How do I find my daily sales variation?
Q2What lead time should I use for FBA?
Q3Which service level should I choose?
Assumes steady demand and a fixed lead time. Plan extra stock for seasonality, promotions and supplier delays.
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