Stock Reorder Calculator
Know when to order and how much. Enter average and peak daily sales and average and longest supplier lead times; the calculator works out the demand during the lead time, a safety stock for peaks and delays, and the reorder point – the stock level at which you should place the next order. Add order and holding costs to get the economic order quantity, and your current stock to see whether to order now.
- Runs in your browser
- No sign-up
- Free to use
For the economic order quantity.
How to use Stock Reorder Calculator
- Enter average and highest daily sales.
- Enter average and longest lead times.
- Add current stock and costs.
- Read the reorder point and EOQ.
Stock Reorder Calculator features
Safety stock
Max-min method.
Reorder point
Lead-time demand + safety stock.
EOQ
Cost-optimal order size.
Order-now check
From current stock.
Formula shown
Every result explains how it was calculated.
Any currency
Choose from 30+ currencies; amounts are formatted for it.
When to use Stock Reorder Calculator
- Small warehouses and shops.
- Ecommerce stock planning.
- Restaurants and supplies.
- Setting reorder levels in inventory software.
Stock Reorder Calculator FAQ
What is safety stock?
Extra stock that covers busier days and late deliveries, so you do not run out while waiting for an order.
What is EOQ?
The order size that balances ordering costs (fewer, larger orders) against holding costs (less stock on hand).
Which demand figures should I use?
Averages and peaks from the last few months of sales data.
Does it work for seasonal products?
Recalculate for each season with that season’s demand.
Avoiding stock-outs and overstock
Running out costs sales and customers; ordering too much ties up cash and space. A reorder point based on real demand and lead times strikes the balance.
The max-min safety stock used here is simple and robust for small businesses. Statistical methods using demand variability can lower safety stock further once you have enough data.
Re-run the numbers whenever an input changes – a supplier raises prices, a fee is updated or demand shifts – because small changes in costs or volumes often have a large effect on the result.
The calculator is deliberately simple: it uses the figures you enter and shows the arithmetic, so you can follow every step and repeat it in a spreadsheet when you want to build a fuller model.