Free Amazon Seller Tool • Updated 2025

Reorder Point Calculator

Never Run Out of Stock

safety stocklead time inventorystockout preventioninventory planning

Inventory Data

Average Daily Sales

Lead Time (days)

Safety Stock Days

Reorder Strategy

Reorder Point

units remaining

Lead Time Demand0 units

Safety Stock0 units

Your inputs are automatically saved for next time

How to Use This Calculator

Enter Daily Sales

Input your average daily unit sales

Set Lead Time

Add total days from order to Amazon receipt

Add Safety Days

Include buffer days for unexpected delays

Get Reorder Point

See when to place your next order

Calculate the optimal reorder point to prevent stockouts while minimizing excess inventory.

Pro Tips

Account for seasonal demand changes
Add extra buffer for ocean shipping
Set calendar reminders based on reorder point

Common Use Cases

Inventory planning

Cash flow management

Supplier coordination

Stockout prevention

Automate Inventory Management

Use inventory management software to automatically track stock levels and reorder timing

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Frequently Asked Questions

How do I calculate reorder point for Amazon FBA?

Reorder Point = (Daily Sales × Lead Time) + Safety Stock. For example: 10 units/day × 30 day lead time + 70 units safety = reorder at 370 units. Our calculator automates this.

What is safety stock and why do I need it?

Safety stock is extra inventory buffer against unexpected demand spikes or shipping delays. Typically 7-14 days of average sales. It prevents costly stockouts that hurt rankings.

How does lead time affect reorder point?

Longer lead times require earlier reordering. If manufacturing takes 30 days + 15 days shipping, you need 45 days of inventory covered when you reorder.

What happens if I run out of stock on Amazon?

Stockouts hurt your Amazon business significantly: you lose sales, organic ranking drops, Best Seller Rank suffers, and competitors gain market share. Use our calculator to prevent stockouts.