Reorder Point Calculator
Use this Reorder Point Calculator to work out when to reorder stock based on sales pace, lead time, and safety stock.
Reorder Point Calculator
Work out when to reorder stock based on average daily sales, lead time, and safety stock.
Reorder point = lead time demand + safety stock. Use it to know when to place your next stock order.
How to Calculate Reorder Point Calculator
A reorder point tells you the stock level at which you should place your next order. For ecommerce businesses, it helps prevent stockouts by making sure you reorder before existing inventory runs too low.
The basic formula is:
Reorder Point = Lead Time Demand + Safety Stock
Lead time demand is the amount of stock you expect to sell while waiting for new inventory to arrive. To calculate it, multiply your average daily sales by your supplier lead time in days.
For example, if you sell 5 units per day and your lead time is 5 days, your lead time demand is:
5 × 5 = 25 units
If you also keep 50 units as safety stock, your reorder point becomes:
25 + 50 = 75 units
That means you should place a new order when your inventory drops to 75 units.
This matters because reorder point is about timing, not just stock volume. It gives ecommerce brands a simple way to know when to buy more inventory based on real sales pace and supplier timing, instead of waiting until stock is already too low.
The most useful reorder points are based on realistic numbers. If your sales speed changes, your lead times become less reliable, or you need more protection during busy periods, your reorder point should be reviewed and updated. Used properly, it helps keep best-selling products in stock without carrying more inventory than you need.
Frequently Asked Questions
Quick answers to common questions about our services, pricing, and process. If you have a specific goal, contact us and we will recommend the best next step.
What Is The Difference Between Reorder Point And Safety Stock?
Reorder point is the inventory level that tells you when to place a new order. Safety stock is the extra buffer you keep to protect against uncertainty, such as supplier delays or sudden demand spikes. They work together, but they are not the same thing.
In practice, safety stock sits inside the reorder point formula. That means safety stock helps absorb risk, while the reorder point acts as the trigger that tells you it is time to replenish
Should Every Product Have The Same Reorder Point?
No. Reorder points should usually be set at the SKU level, because products move at different speeds, have different lead times, and carry different stockout risk. A single reorder point across an entire catalog usually ignores those differences and leads to weaker inventory decisions.
For ecommerce businesses, this matters even more when best-sellers, seasonal products, bundles, and slower-moving SKUs all sit in the same store. The more variation you have across products, the more important it becomes to set reorder points per SKU instead of using one blanket rule.
How Often Should Reorder Points Be Reviewed?
Reorder points should be reviewed regularly because they can change as sales patterns, supplier reliability, and lead times change. Inventory guidance consistently treats reorder points as thresholds that need reassessment rather than numbers you set once and never revisit.
For ecommerce brands, a practical review schedule is usually weekly or monthly, depending on how quickly products move and how often demand changes. Faster-moving or more seasonal products generally need more frequent review than stable items with predictable demand and dependable suppliers.
Can A Reorder Point Be Too High Or Too Low?
Yes. A reorder point that is too low increases the risk of stockouts, missed sales, and delayed fulfillment. A reorder point that is too high can push a business into overordering, which increases carrying costs and ties up cash in inventory sooner than necessary.
That is why reorder points work best when they are based on realistic sales velocity, realistic lead times, and an appropriate safety buffer. The goal is not to hold as much stock as possible. The goal is to reorder early enough to stay available without creating unnecessary excess.
Should Promotions And Seasonality Change Your Reorder Point?
Yes. Reorder points should reflect real demand conditions, not just a flat average. Seasonal trends, peak trading periods, launches, and planned promotions can all increase sales velocity, which means the reorder point often needs to rise as demand rises.
For ecommerce businesses, this is especially important before major campaigns or high-volume periods. A reorder point based on a quiet trading window can look fine on paper but still leave you understocked when demand accelerates.
What Is The Difference Between Reorder Point And Reorder Quantity?
Reorder point tells you when to reorder. Reorder quantity tells you how much to order once you decide to replenish. They are related, but they answer different questions and should not be treated as the same metric.
In ecommerce operations, both matter. Reorder point helps you avoid waiting too long, while reorder quantity helps you order enough stock to last until the next replenishment cycle. Using one without the other can leave gaps in your inventory planning.
Can You Use A Reorder Point Without Safety Stock?
Yes, but it increases risk. Some businesses use a reorder point based only on demand during lead time, especially if they want to run lean and accept a greater chance of stockouts. That approach is simpler, but it leaves less room for supplier delays or demand volatility.
For most ecommerce brands, some level of safety stock is the better choice. It gives the reorder point a buffer against real-world variation, which is important when customer demand and supply timing do not behave exactly as expected.
What Should You Track Alongside Reorder Point?
Reorder point works best when it is paired with the numbers that drive it, especially sales velocity, supplier lead time, safety stock, and current inventory position. Those metrics help explain whether your reorder trigger still reflects current trading conditions.
For ecommerce brands, it is also useful to watch stockouts, excess stock, and changes in demand over time. Reorder point tells you when to act, but those supporting metrics help you understand whether the rule is still right for the product.
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