How to Set Up Low Stock Alerts and Never Run Out

Running out of a popular product is one of the most preventable problems in small business. A customer wants to buy, you do not have the item, and the sale is lost. Worse, the customer may not come back. Low stock alerts solve this by notifying you when inventory drops to a level where you need to reorder, giving you enough lead time to replenish before you hit zero.

Setting up effective alerts is not complicated, but it requires thinking through your specific products and supply chain. Here is how to do it right.

What Is a Low Stock Alert

A low stock alert is a notification triggered when the quantity of an item falls below a threshold you define. That threshold is called the reorder point. When your stock hits that number, the system sends you an alert via email, push notification, or in-app message so you can place an order with your supplier.

The key is setting the reorder point at the right level. Too high, and you get unnecessary alerts and order too early. Too low, and you get the alert when it is already too late.

How to Calculate Your Reorder Point

The reorder point depends on two factors: how fast the item sells and how long it takes to get more.

The basic formula is:

Reorder Point = (Average Daily Sales) x (Supplier Lead Time in Days) + Safety Stock

For example, if you sell 5 units per day and your supplier takes 4 days to deliver, your base reorder point is 20 units. Adding safety stock of 10 units gives you a reorder point of 30 units. This means you will receive an alert when you have about 6 days of stock remaining, giving you a comfortable buffer.

What Is Safety Stock

Safety stock is extra inventory you keep as a buffer against unexpected demand or supplier delays. Without it, any variation in sales or delivery time can lead to a stockout.

The amount of safety stock you need depends on:

How variable your sales are (seasonal items need more buffer)
How reliable your supplier is (unreliable suppliers require more safety stock)
How critical the item is (your bestseller needs a larger buffer than a slow mover)

A common starting point is to set safety stock at 20 to 30 percent of your reorder point and adjust from there based on experience.

Setting Up Alerts Step by Step

Here is the process for configuring low stock alerts in an inventory management tool:

Review your sales data for each item to determine average daily sales
Find out the lead time for each supplier
Calculate the reorder point using the formula above
Enter the reorder point for each item in your inventory system
Choose your notification method (email, push notification, or both)
Set the frequency of alerts (immediate, daily digest, or weekly summary)

Alerts for Different Product Categories

Not all items need the same alert configuration. Consider grouping your products:

High-volume, fast-moving items: Set lower reorder points relative to volume and check alerts daily
Seasonal items: Adjust reorder points before peak seasons and lower them during slow periods
Long-lead-time items: Set higher reorder points to account for extended delivery times
Low-volume items: Use simpler thresholds since small fluctuations have less impact

Common Alert Mistakes

Avoid these pitfalls when setting up your alert system:

Setting the same reorder point for all items regardless of sales velocity
Ignoring supplier lead time when calculating thresholds
Not adjusting reorder points seasonally
Setting alerts but not acting on them promptly
Forgetting to update thresholds when sales patterns change

Reviewing and Adjusting

Low stock alerts are not set-and-forget. Review your reorder points quarterly and adjust based on actual sales data. Items that sell faster than expected need higher reorder points. Items that have slowed down can have their thresholds lowered to reduce carrying costs.

Most inventory tools, including ShelfTrack, let you view alert history and adjust reorder points from a single dashboard. Spending 15 minutes per month reviewing your settings can prevent the majority of stockout situations.