How to Calculate Reorder Level: A Step-By-Step Guide

December 6, 2023
15 min read

Key Points

  • Understanding and implementing effective reorder levels is a strategic advantage that impacts customer satisfaction, financial resources, and operational efficiency.

  • The basic formula for calculating reorder levels is Reorder Level = (Lead Time in Days × Average Daily Usage) + Safety Stock. Each component has its own significance and should be monitored closely.

  • Several variables, like seasonal demand, supplier reliability, and specific calendar dates, can influence reorder point calculations. A proactive, data-driven approach is essential for accurate inventory management.

  • Mistakes in reorder level calculations can be costly. Awareness of common pitfalls like over-reliance on historical data and neglecting supplier lead time variability can save both time and money.

  • Bezos offers a comprehensive solution for mastering reorder levels, providing real-time inventory tracking, advanced demand forecasting, and insightful reporting. It's a one-stop solution for optimising your supply chain.


In the dynamic eCommerce environment, inventory management often poses a challenge. You're either grappling with overstocked items gathering dust or facing the dreaded "out of stock" label just when demand peaks. 

That's where the magic of reorder levels comes in – a key metric that tells you the perfect time to restock. But how do you keep tabs on this crucial number without getting lost in spreadsheets?

This guide is your lifesaver. We'll unravel the complexities of restocking, walk you through their calculation, and reveal how Bezos's intuitive dashboard streamlines the whole process.

What Is a Reorder Level and Why Is It Important?

In the realm of merchandise management, the term "reorder level" might sound technical, but its essence is straightforward. It's the inventory threshold that triggers a new order for a particular product. In simpler terms, it's the "low fuel" warning light for your stock, signalling that it's time to replenish before you run out completely.

The task of pinpointing and managing your reorder levels is far from a mere logistical exercise; it's a strategic imperative that wields a profound impact on your business. The stakes are high, and here's why:

Benefits DescriptionBusiness Impact
Enhanced Customer ExperienceEnsures that customers always find what they're looking for, leading to increased satisfactionBoosts customer loyalty and repeat sales
Strategic Cash Flow ManagementAvoids overstocking, thereby freeing up valuable capital for other usesEnhances financial flexibility and resource allocation
Optimal Use of Warehouse SpaceUtilises warehouse space in a cost-effective manner without the burden of excess stockReduces storage costs and improves efficiency
Reduced Urgency for Emergency OrdersLowers the need for last-minute, expensive orders by proper schedulingDecreases operational costs and stress levels

The Mechanics of Calculating Reorder Levels

Alright, enough theory – let's roll up our sleeves and dive into the formula that makes reorder levels tick. Trust us, it's not as daunting as it sounds, and the payoff is immense.

The basic formula is:

Reorder Level = (Lead Time in Days × Average Daily Usage) + Safety Stock

Let's break down what each component means:

  • Lead Time in Days: This is the amount of time it takes from placing an order to receiving the goods. It's crucial to know this number as it helps you understand how long you'll be without stock.

  • Average Daily Usage: This is the average number of units sold per day. You can calculate this by taking the total units sold over a specific period and dividing it by the number of days in that period.

  • Safety Stock: This is your buffer stock, kept aside to account for variability in lead time or demand. It's essentially your safety net in case things don't go as planned.

Keeping track of these variables need not be a Herculean task. With Bezos's advanced inventory management software, you can effortlessly monitor all three metrics. Our platform offers real-time analytics, enabling you to adjust your reorder levels based on up-to-the-minute data. Plus, we assign a dedicated human account manager to oversee the entire process, ensuring everything runs smoothly and that help is always just a call or email away. 

Ready to make inventory management a breeze? Speak to an expert today and discover the Bezos advantage.

Real-World Application: The Reorder Point Formula in Action

To truly grasp the utility of the reorder level formula, let's delve into a practical example. Consider a hypothetical eCommerce business that sells organic skincare products.

The Scenario

An eCommerce business can sell various organic skincare items, but for this example, let's concentrate on one of its products: organic face serum.

  • Product: Organic face serum
  • Lead Time in Days: 14 days (time taken from placing an order to its arrival)
  • Average Daily Usage: 20 units (based on past sales data)
  • Safety Stock: 50 units (buffer stock to account for unexpected demand or supply delays)

Applying the Formula

Now, let’s apply the formula and calculate the reorder level:

Reorder Level = (14 days × 20 units/day) + 50 units

Reorder Level = 330 units


In this example, the business should reorder the organic face serum when the stock level drops to 330 units. This ensures that they have enough stock to meet demand during the 14-day lead time and also have a safety buffer of 50 units in case of unexpected fluctuations in demand or supply.

Factors Influencing Reorder Point Calculations

Several elements can influence your reorder point calculations. These variables are often dynamic, requiring constant vigilance and adjustment. In this section, we'll delve deeper into these factors, offering you a roadmap to navigate the complexities.

The Ebb and Flow of Demand

Consumer demand is an unpredictable force, shaped by influences like seasonal shifts, economic variations, and even trending social media happenings.

Tip for Management

To account for these fluctuations, keep a close eye on historical sales data. Use this information to identify recurring patterns or anomalies. Adjust your average daily usage metric based on these insights, and consider implementing a more dynamic, data-driven approach to demand forecasting.

Supplier Reliability

The robustness of your stock management hinges on the reliability of your least dependable supplier. Delays in shipment, inconsistent product quality, or even a vendor going out of business can throw a wrench in your inventory plans.

Tip for Management

Don't put all your eggs in one basket. Diversify your supplier base to mitigate risks. Additionally, maintain a 'safety buffer' of emergency stock to cushion against unforeseen issues. Regularly review your vendor performance metrics and be prepared to make swift changes if needed.


The calendar can be your friend or foe. Public holidays, weekends, and even specific times of the month can significantly impact both demand and supply chain operations.

Tip for Management

Note down significant dates that might impact your stock levels, including bank holidays, sales events like Black Friday, or even local festivals. Use these milestones to recalibrate your reorder thresholds ahead of time so you avoid having either too much or too little merchandise.

Common Pitfalls and How to Avoid Them

Even with the best intentions and meticulous planning, mistakes can happen. When it comes to reorder level calculations, these errors can cost you both time and money. Below is a table that identifies some of the most common pitfalls and provides strategies to avoid them.

Common PitfallDescriptionSolution
Over-Reliance on Historical DataRelying solely on past trends can make your inventory vulnerable to market changesUse a mix of historical data and real-time analytics for balanced decisions
Ignoring Seasonal VariationsFailing to adjust reorder levels for seasonal demand fluctuationsUpdate your reorder levels seasonally, using past data as a baseline
Neglecting Supplier Lead Time VariabilityLead times can vary due to holidays, strikes, or natural disastersMaintain a safety stock buffer and regularly update lead time data
Lack of Regular AuditsDiscrepancies between recorded and actual stock can occurSchedule regular audits and reconcile any differences immediately
Forgetting to Factor in Business GrowthReorder levels may not reflect the needs of a growing businessPeriodically review and adjust in line with business growth metrics

Why Choose Bezos for Mastering Reorder Levels?

Inventory management can often feel like navigating a complex maze. But what if you had an expert guide to lead you through the intricacies, ensuring you never miss a crucial turn? Welcome to Bezos, your go-to partner for mastering reorder levels and optimising your entire supply chain ecosystem.

Inventory Management: Beyond the Basics

At Bezos, we understand that stock administration is not just about numbers; it's about achieving a harmonious balance between demand and supply. Our cutting-edge platform offers real-time inventory tracking, ensuring you always have the right products in the right quantities at the right time. We also partner with some of the world’s best fulfilment centres, warehouses, and locker networks. Say goodbye to stockouts and overstocking and hello to a lean, efficient inventory.

Bezos: Predictive Mastery

The market is ever-changing, and so are your customers' needs. Bezos employs advanced machine learning algorithms to analyse your sales data, seasonal trends, and economic variability. This enables us to provide you with precise demand forecasts, allowing you to adjust your reorder levels proactively. 

Insightful Reports: Knowledge Is Power

Data is only as good as the insights derived from it. Bezos's analytics suite offers comprehensive reports that go beyond surface-level metrics. Understand your best-selling products, identify bottlenecks in your supply chain, and gain actionable insights to drive strategic decisions. With Bezos, you're not just collecting data; you're harnessing it to fuel your business growth.

The Bezos Advantage: What Sets Us Apart

Let's delve into more compelling reasons for why Bezos should be your preferred choice:

  • Personalised Service: We recognise that every business is unique. Our platform is flexible enough to adapt to your specific needs, ensuring a tailored experience.

  • Transparency and Responsiveness: Our commitment to transparency means you'll always know the status of your merchandise. Plus, our customer support team is always just a call or email away, ensuring you receive timely responses to your queries.

  • No Long-Term Contracts: We believe in the quality of our service, which is why we don't lock you into lengthy contracts. Simply, experience the Bezos advantage without any long-term commitments.

  • Global Reach: With distribution centres in the UK and additional hubs worldwide, we're equipped to take your business to the next level, wherever that may be.

Are you prepared to enhance your inventory control and base your decisions on data, driving your business to greater heights? Trust Bezos as your strategic partner in mastering reorder levels and much more. Get your free quote today and discover the myriad ways we can supercharge your supply chain.


So there you have it, a complete guide to mastering the art and science of reorder levels. Armed with this knowledge, you're well-prepared to navigate the labyrinth of stock administration, making informed decisions that positively impact your bottom line. As you venture forth, remember that Bezos stands ready to be your valued ally, offering a suite of tools designed to make your journey not just manageable but truly optimised. Your path to inventory excellence starts now. Seize the opportunity.


What is the reorder level formula?

The reorder level formula is utilised to ascertain the appropriate moment for replenishing a specific item in stock. The formula is as follows: Reorder Level = (Lead Time in Days × Average Daily Usage) + Safety Stock. For streamlined tracking of these metrics, you can hire a trusted eCommerce solutions company like Bezos.

Is reorder level the same as EOQ?

No, reorder level and Economic Order Quantity (EOQ) are not the same. The reorder level indicates when it's time to place a new order for a product to avoid stockouts. EOQ, on the other hand, calculates the optimal order quantity to minimise costs related to holding, ordering, and shortage. 

At which level of stock should you reorder?

When your stock inventory reaches the predetermined point known as the reorder level, it's time to initiate replenishment. This threshold is determined using the formula: Reorder Level = (Lead Time in Days × Average Daily Usage) + Safety Stock. This level ensures that you have enough inventory to meet demand during the lead time for a new shipment while also accounting for any unexpected fluctuations in demand or supply.

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