How to use this calculator
Enter stock on hand, average daily sales, supplier lead time, and desired coverage days. The calculator estimates when to reorder and how many units to buy.
#1054 · E-commerce Tool
eBay Reorder Calculator
Plan eBay inventory before stockouts happen. Use current stock, daily sales, supplier lead time, and target coverage to estimate reorder point, reorder quantity, and inventory risk.
Calculator
E-commerce inputsunits
/day
days
days
Ad space
What the result means
A reorder point prevents stockouts during supplier lead time. A strong result means inventory covers demand without tying up too much cash.
Reorder Point = Daily Sales × Lead Time + Safety Stock. Recommended Order = Daily Sales × Target Coverage - Current Stock.
This estimate assumes stable daily demand. Seasonal products need higher safety stock.
Example calculation
With 120 units, 6 sales per day, 14 days lead time, and 45 days target coverage, reorder point is 84 units and target stock need is 270 units.
Tips for better results
- Use recent sales speed, not lifetime average, for fast-changing items.
- Add safety stock for seasonal or supplier-risk products.
- Do not overorder slow-moving inventory just to avoid stockouts.
FAQ
When should I reorder inventory for eBay?
Reorder when current stock approaches daily sales multiplied by supplier lead time, plus any safety stock needed for demand spikes.
How many units should I reorder for eBay?
Order enough to reach your target coverage days after accounting for current stock and incoming inventory.
How do I avoid stockouts on eBay?
Track daily sales, supplier lead time, and reorder point. Place orders before inventory falls below the reorder threshold.
What is a good inventory turnover for eBay sellers?
A good turnover depends on category, but faster turnover with stable margins usually means less cash tied up in stock.
How much safety stock should I keep for eBay products?
Safety stock should cover unexpected demand or supplier delays. Higher-risk products need more safety stock than predictable products.
Related calculators
Inventory decision table
| Metric | Use |
|---|---|
| Reorder Point | Stock level where a new order should be placed. |
| Days Left | Estimated time before stockout. |
| Order Quantity | Units needed to reach target coverage. |
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