Reorder Point for China Imports: How to Avoid Stockouts

06.11.2026·6 min read·Delivery Pro China

Reorder point for shipments from China: how to calculate the full supply cycle, safety stock, and account for seasonality. Learn the formula – read the article.

In brief: The reorder point for shipments from China is calculated as the product of the average daily consumption and the full supply cycle in days, plus safety stock. The full cycle includes not only transportation but also production at the supplier's facility, receiving, and document processing. Without accounting for these stages, the calculation systematically produces an understated result.

What a Reorder Point Is and Why It Matters

A reorder point is the inventory level at which a new order must be placed. The idea is straightforward: while a new shipment is in transit, you continue selling from your current stock. The goal is to ensure the inventory does not reach zero before the goods arrive.

When shipments are infrequent and the product range is narrow, many buyers determine this moment by intuition. With regular shipments from China across several dozen SKUs, an intuitive approach stops working: too many variables, too long a cycle.

The reorder point formula is:

Reorder point = average daily consumption × full supply cycle (days) + safety stock

Each of these figures requires a separate calculation.

How to Calculate the Full Supply Cycle Correctly

The most common mistake is treating the supply cycle as equal to transit time. If you know that a road route from Guangzhou takes a certain number of weeks, that is only one part of the equation.

The full cycle includes:

• Order confirmation and placement with the supplier: agreeing on the specification, paying the deposit, receiving production confirmation.
• Production or assembly: for made-to-order goods this can range from several days to several weeks; for ready stock at the supplier's warehouse it is minimal but still non-zero.
• Receiving and inspection at the origin warehouse: in Guangzhou goods are received, counted, checked, and consolidated with other items if necessary.
• Document preparation: commercial invoice, packing list, certificates – preparation takes time, especially if the supplier is slow.
• Transportation via the selected route.
• Customs clearance and delivery to the consignee's warehouse.

Omitting the production cycle is a systematic error. If the supplier manufactures goods to order and the production lead time is three weeks, but you account only for transit time, the reorder point will be understated by exactly those three weeks.

Safety Stock: How to Determine the Right Level

Safety stock is an additional buffer that covers deviations from the plan: a supplier delay, abnormal demand, or a force majeure event during transportation.

The calculation logic: determine the maximum possible shipment delay in days and multiply it by the average daily consumption. This is the minimum safety stock.

For fast-moving items where the consumption rate is unstable, safety stock is calculated taking demand variability into account: take the difference between the maximum and average daily consumption and multiply it by the supply cycle.

For slow-moving items with infrequent and unpredictable sales, the standard calculation produces a result that is too low. Here it is more practical to define a minimum stock level below which you are not prepared to drop, and use it as a fixed safety stock.

How Seasonality Affects the Reorder Point

If demand for a product has a pronounced seasonal pattern, a single reorder point for the entire year does not work. Before a seasonal peak, the average daily consumption will be higher than the annual average, and if you use the annual mean, the reorder point will be understated.

A practical approach: 1.5–2 supply cycles before the season begins, recalculate the reorder point using the projected consumption for the growth period rather than the historical average. Data from previous years is your primary reference.

The reverse situation is the post-season slowdown. If you placed an order based on peak consumption but the season is already ending, the surplus will sit until the following year. For goods with a limited shelf life or those that become obsolete quickly, this is a direct loss.

Fast-Moving and Slow-Moving Items: Different Approaches

For fast-moving items, the reorder point is reviewed regularly – once a month or when sales change significantly. Consumption for such items is forecastable, so the formula works well.

For slow-moving items, the average daily consumption formula loses its meaning when only 2–3 units are sold per month. Here it is more logical to work with a minimum stock level: define how many units must always be held in the warehouse and place a new order when the stock drops to that level.

What Happens When the Calculation Is Wrong

Underestimating the reorder point leads to a stockout: the product runs out before the shipment arrives. For online stores and marketplaces this means lost sales and a drop in search rankings. For manufacturing companies it means a line stoppage. For wholesalers it means losing a customer who will go to whoever has the product in stock.

Overestimating the reorder point leads to excess stock: you hold more than needed. This ties up working capital, generates unnecessary warehousing costs, and creates a write-off risk – particularly relevant for seasonal or quickly obsolete goods.

Both scenarios cost more than the time required to do a proper calculation.

How to Build a Calculation for Your Product Range

A practical algorithm for each SKU:

1. Take sales data for the past 60–90 days and calculate the average daily consumption.
2. Break down all stages of the supply cycle in days: from the moment the order is placed to the moment goods arrive at your warehouse.
3. Multiply consumption by the cycle.
4. Determine safety stock – consumption for the period of a possible delay.
5. Add the results together: this is your reorder point.
6. Enter the value in a table alongside the current stock level and the expected next arrival date.

When such a table is maintained for all SKUs, the decision to order no longer depends on memory or gut feeling – it becomes a procedure that can be delegated.

Frequently Asked Questions

Should the reorder point be recalculated with every shipment? For fast-moving items it is recommended to update the calculation monthly or when sales change by more than 20–30%. For slow-moving items, a quarterly review or a review at the change of season is sufficient.

How do I account for the supplier occasionally delaying production? Include the historical maximum delay in the safety stock calculation. If the supplier regularly runs 7–10 days late, add the consumption for that period to the safety buffer.

What if there are no 90-day sales figures – the SKU is new? For new items, use a conservative forecast with an increased safety stock. After the first two or three supply cycles, switch to a calculation based on actual data.

Does the choice of shipping route affect the reorder point? Yes, directly. Air express shortens the transportation leg but does not eliminate the production cycle at the supplier's facility. A road route has a longer transit time, so all else being equal, the reorder point shifts earlier.

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