Your warehouse is growing, but your overview isn't growing with it. Orders are being picked more slowly, inventory levels are no longer accurate, and you notice that Excel spreadsheets and loose notes are no longer sufficient. In this article, you will read exactly what a WMS is, which problems it solves, and which signals indicate it is time to invest.
What exactly is a WMS?
A WMS, or warehouse management system, is software that controls and records all processes in your warehouse: from goods receipt and storage to picking, packing, and shipping. The system knows exactly what inventory you have, where it is located, and what needs to happen with each order.
Unlike accounting software or an Excel inventory list, a WMS works in real-time and is location-based. Every inventory movement, every picking action, and every shipment is recorded immediately. No more outdated counts, but an up-to-date picture of what is physically in your warehouse.
The core functions of a WMS are:
- Inventory management by location (shelf, aisle, pallet)
- Order control: which employee picks what, in what order
- Barcode scanning for validation upon receipt, storage, and transmission
- Reports on lead time, error rate, and inventory accuracy
WMS versus ERP: what is the difference
An ERP (enterprise resource planning) system revolves around the administrative and financial side of your business: invoicing, purchasing, accounting, and sometimes HR. A WMS focuses purely on warehouse operations: what is located where, who picks what, and how quickly an order leaves the warehouse.
Many companies combine both systems. For example, the ERP manages purchase orders, while the WMS handles physical receiving and storage. Some ERPs have a basic inventory module, but it usually lacks the scanning, location tracking, and picking optimization that a true WMS offers.
WMS versus Excel or a simple inventory system
Excel works fine as long as your inventory is well-organized and you process few orders per day. As soon as you have multiple employees in the warehouse at the same time, track multiple locations, or process dozens of orders daily, you run into its limitations.
Excel sheets then become a source of errors: duplicate entries, outdated versions, and no control whatsoever over what an employee actually retrieves. A WMS eliminates that manual step by validating every action with a scan.
What problems does a WMS solve?
Most companies only purchase a WMS when the pain becomes noticeable. Recognizable bottlenecks are:
- Incorrect or slow order picking. Employees search for products for too long because locations are not clearly defined.
- Stock discrepancies. The system says 40 items, the shelf contains 34. Shrinkage, counting errors, and incorrect write-offs are piling up.
- No real-time insight during peak periods. During Black Friday or the end-of-year rush, you are no longer sure if a product is still available.
- Error-prone manual work. Duplicate entry in multiple systems, separate spreadsheets that do not synchronize.
- Difficulty scaling up. Opening a second warehouse or adding a new sales channel becomes an organizational nightmare without central coordination.
Recognizable symptoms in the daily process
You often recognize these problems by concrete signs in the workplace:
- Employees are walking back and forth because the picking list is not logically organized.
- At the end of the day, “untraceable” orders remain.
- Customer service receives questions about stock that the system cannot answer.
- Physical inventory counts take half a day or more, every month.
Tip: For a week, keep track of how much time your team spends searching for products or correcting inventory errors. That time is often the first concrete ROI indicator for a WMS.
Do I need a WMS? Concrete signals
There is no fixed order threshold at which a WMS becomes mandatory, but there are clear indicators.
Checklist: 6 signs that you are ready for a WMS
- You consistently process more than 50 to 100 orders per day. Beyond this volume, manual management using Excel or loose picking slips becomes unsustainable.
- Your assortment contains many SKUs or complex variants. Think of colors, sizes, or sets that need to be put together separately.
- Your error rate in orders is above 1 to 2%. That leads to more returns, extra shipping costs, and dissatisfied customers.
- Inventory counts take a lot of time. Manually counting and correcting weekly or monthly is a sign that you do not have real-time control.
- You sell through multiple channels. Webshops, marketplaces like bol.com, and B2B orders require central inventory synchronization.
- You outsource fulfillment, or offer it yourself. Fulfillment parties definitely need a WMS to separate multiple customers and inventory flows.
When a WMS is not yet needed
If you process fewer than 30 to 40 orders per day, with a manageable assortment of at most a few dozen SKUs, a simple inventory system may still suffice. In that case, it is better to invest in a well-configured Excel template or a lightweight inventory tool, and save the WMS budget for when you grow.
Please note: Do not wait too long to make the switch. Many companies only switch when the chaos is already palpable in complaints and returns. Implementing a WMS during a peak period is always more stressful than during a quiet period.
How does a WMS work in practice
A WMS tracks the entire logistics process, from the moment goods arrive to the shipping label on the door.
Inbound: upon receipt, you scan the incoming goods. The system links this to the purchase order and assigns a storage location (put-away).
Location management: you can choose between fixed locations (each product has a fixed spot) or dynamic locations (the system assigns the most logical available spot based on turnover rate and space).
Outbound: as soon as an order arrives, the WMS generates a picking list, often optimized for walking routes. The employee scans each product for validation, after which the package is packed and a shipping label is created.
Synchronization: the WMS communicates in real-time with your webshop and sales channels, ensuring inventory is always up-to-date, even with simultaneous orders.
Reports: lead time per order, picking efficiency per employee, and inventory accuracy give you continuous insight into the operation.
Example process: from order to shipping label
| Step | Action | Involved system |
|---|---|---|
| 1. Order receipt | Order is placed in webshop | Webshop/OMS |
| 2. Order synchronization | Order appears automatically in WMS | WMS |
| 3. Picking list | System generates optimized walking route | WMS |
| 4. Picking | Employee scans products for validation | WMS + scanner |
| 5. Packing | Order is being packed, packing slip generated | WMS |
| 6. Shipping label | Label is automatically created via carrier integration | WMS + carrier |
| 7. Stock update | Inventory is written off immediately | WMS |
The benefits of a WMS: costs and ROI
The direct return of a WMS lies in time savings and error reduction. Less search time during picking, fewer returns due to incorrect shipments, and better utilized warehouse space through smart location management.
In the long run, scalability is the greatest gain: you can process more orders without hiring proportionally more staff, because the system maintains the overview instead of a human.
Cost items to take into account
- License fees or subscription (often per user or per order volume)
- Implementation and integrations with webshop, accounting, and carriers
- Hardware such as scanners and label printers
- Training your team
- Any custom integrations
How to make a rough ROI calculation
First, calculate your current costs: hours spent on manual inventory control, costs of returns due to incorrect orders, and lost revenue due to inventory errors. Compare this to the expected savings after implementation, for example, 20 to 30% faster picking processes and a halving of the error rate.
In a warehouse processing 200 orders per day with an average error rate of 3%, a reduction to 1% can quickly save thousands of euros per month in return costs and customer service hours. For most scale-ups, the payback period is between 6 and 18 months, depending on order volume and complexity.
What to look for when choosing a WMS
Not every WMS suits every company. Pay attention to the following points when making your choice.
Integrations: does the system work with your webshop (Shopify, WooCommerce, Magento), accounting software, and the carriers you use?
Scalability: does the system still function well if your order volume triples or quadruples? Ask for concrete examples of customers who have grown.
User-friendliness: can new warehouse employees work with the system within a day, or is weeks of training required?
Cloud versus on-premise: cloud solutions are faster to implement and require less in-house IT management. On-premise offers more control, but requires more in-house technology.
Support and onboarding: a good supplier guides you through the start-up, helps think about configuration, and is available if something goes wrong. Lyra WMS, for example, offers active guidance during the implementation phase, so that you receive not only software but also practical help with the configuration.
Questions you should ask a WMS supplier
- Which integrations are available by default, and which require customization?
- What is the average implementation time for a company of my size?
- How does the system scale in terms of price and performance with growth?
- What support will I receive after going live, and at what cost?
- Can I test with my own data first before I sign?
Option 1, start small: begin with one process, for example only outbound picking, and then expand to inbound and reporting. Option 2, full implementation: roll out the entire process at once, including all integrations. Faster results, but a bigger change for your team all at once.
Step-by-step plan: getting started with a WMS
- Map out your current process. What steps does an order go through, and where do delays and errors occur?
- Determine must-haves versus nice-to-haves. Do you absolutely want an integration with a specific marketplace, or is that a nice bonus?
- Request demos and test with real data. Let your team observe during a trial period, not just the operations manager.
- Plan a phased implementation. Start with one warehouse or process before you overhaul everything at once.
- Train your team and measure results after going live. Closely monitor error rate, lead time, and picking efficiency during the first few months to make adjustments where necessary.
Frequently asked questions
What does a WMS cost on average?
Costs vary significantly depending on your order volume, the number of users, and the integrations you require. Some suppliers work with a base fee plus a subscription, while others use a full subscription model based on order volume. Always request a quote based on your specific situation; generic prices mean little without context.
Is a WMS only for large companies?
No. Modern cloud-based WMS solutions have actually been made accessible to scale-ups and smaller fulfillment companies. Scalable subscriptions mean that you can start with a basic version and grow along as your order volume increases.
Can I connect a WMS to my webshop?
Yes, most WMS systems offer standard integrations with platforms such as Shopify, WooCommerce, and Magento, and with marketplaces such as bol.com. Check with the vendor which integrations are available out of the box and which require customization.
How long does the implementation of a WMS take?
That depends on the complexity of your processes and the number of integrations. A simple implementation with a single webshop connection can be live within a few weeks, while a more complex project involving multiple channels and customization can easily take a few months.
What is the difference between a WMS and an OMS?
An OMS (order management system) focuses on order processing across various sales channels: it collects orders from your webshop, marketplaces, and potentially B2B channels in one place. A WMS focuses on the physical execution in the warehouse: where the inventory is located, how picking is performed, and what is shipped. In practice, both systems often work together, with the OMS supplying orders and the WMS handling the physical fulfillment.
Would you like to know how to handle this in your warehouse? Schedule a no-obligation discovery call and we'll go through it together.
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