eBay Reorder Point Calculator
Estimate when to reorder eBay inventory based on average sales, supplier lead time and safety stock.
Overview
Use this eBay reorder point calculator to estimate when to place your next stock order. Enter your average daily sales, supplier lead time, safety stock, current inventory and usual reorder quantity to see the stock level where reordering makes sense.
How it works
The calculator estimates how many units you are likely to sell during supplier lead time by multiplying average daily sales by lead time in days. It then adds your chosen safety stock to create a reorder point. When your inventory drops to that level, placing a new order should help you avoid stockouts under normal conditions. It also estimates how many days remain before you reach that point and how much stock you may have after your next order arrives.
How to use this calculator
- 1Enter the average number of units you sell per day.
- 2Add your supplier lead time in days.
- 3Enter the safety stock you want to keep as a buffer.
- 4Input your current inventory level.
- 5Add your usual reorder quantity and review the estimated reorder point and timing.
Example Calculation
Average Daily Sales
5
Supplier Lead Time
14
Safety Stock
20
Current Inventory
100
Planned Reorder Quantity
200
Reorder Point
90 units
If you sell 5 units per day, have a 14-day lead time and keep 20 units as safety stock, your reorder point is 90 units. With 100 units currently in stock, you may need to reorder in about 2 days.
Frequently asked questions
What does the eBay reorder point calculator estimate?
It estimates the stock level where you should place a new order based on average daily sales, supplier lead time and safety stock.
What is a reorder point?
A reorder point is the inventory level that signals it is time to buy more stock so you are less likely to run out before the next delivery arrives.
How do I choose safety stock?
Safety stock is a buffer for sales spikes, delays or forecast errors. Sellers often base it on past demand swings and supplier reliability.
Should I use average daily sales or monthly sales?
This calculator uses average daily sales. If you track monthly sales, divide by the number of selling days in that month to estimate a daily average.
Does this calculator include seasonal demand changes?
No. It uses a simple average sales rate, so you may want to adjust your inputs during peak or slow periods.
Can I use this for multiple eBay products?
Yes. Calculate each product separately using its own sales rate, lead time, safety stock and inventory level.
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Assumptions and warnings
Assumptions
- Sales are spread evenly over time using your average daily sales figure.
- Supplier lead time is assumed to be consistent for each order.
- Safety stock is set manually and reflects the buffer you want to keep.
- Results are estimates and do not include seasonality, returns, damaged stock or listing interruptions.