2026 Amazon FBA Restock Quantity & Order Calculator: Calculate exact reorder units and working capital required for FBA replenishment shipments.
Verify before you act
Fees vary by ASIN, category, package size and weight, and marketplace. Confirm exact 2026 rates on the official Amazon Seller Central Documentation before pricing or sourcing decisions. This tool is provided for seller planning purposes only.
Inventory & Demand Inputs
days
days
$
Reorder Recommendation Urgent Reorder Needed
Recommended Restock Quantity
1,450 units
Order 1,450 units to reach 60 target days of supply
Purchasing Capital Required(@ $12.50 / unit)
$18,125.001,450 units purchase order
Total Pipeline Supply17.5 days(350 total units)
FC On-Hand Supply10.0 days(200 FC units)
Frequently Asked Questions — Amazon Restock Planning
Learn how to forecast reorder units, account for lead times, and optimize purchasing capital
What is an Amazon Restock Quantity Calculator?▼
A Restock Quantity Calculator determines the exact number of inventory units you need to reorder today to reach your target days of supply, factoring in current FC stock, in-bound shipments, daily sales velocity, and lead times.
How is recommended restock quantity calculated?▼
Formula: Target Units Needed = Average Daily Sales × (Target Days of Supply + Lead Time Days). Available Inventory Pipeline = Current FC Inventory + In-Transit Quantity. Recommended Restock = MAX(0, Target Units Needed - Available Inventory Pipeline).
Why include lead time in restock quantity calculations?▼
Inventory ordered today will not arrive at Amazon FCs until lead time elapses. Accounting for lead time ensures your FC inventory does not stock out while replacement inventory is in transit.
What is an optimal target days of supply for Amazon FBA?▼
Most Amazon sellers target 60 to 90 days of supply. Maintaining at least 28 days of supply prevents Amazon's Low-Inventory-Level Fee, while keeping supply under 180 days avoids Aged Inventory Surcharges.
How does restock capital calculation help inventory planning?▼
Multiplying your recommended restock unit count by your landed cost per unit gives you the exact purchasing capital required for your next supplier purchase order.
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