According to E-commerce Trix, Shopify powers over 5.6 million active online stores worldwide. It processed more than $300 billion in gross merchandise volume in 2025, and generated $11.56 billion in annual revenue, cementing it as a solid platform for many ecommerce businesses. As your business scales, proper inventory management becomes increasingly crucial.

To start off, inventory management and inventory planning are two different jobs.

Shopify handles the former by tracking stock levels. The latter of forecasting what to order and when would require a dedicated tool, especially as your SKU count grows and demand becomes unpredictable.

In this five-part guide, it will walk you through Shopify’s built-in inventory system, show you how to manage stock effectively, and improve stock control.

Read also: Shopify’s Stocky Is Shutting Down August 31 - Alternative To Stocky

Part 1: Setting Up Inventory Tracking in Shopify

Before layering any planning tool on top, here’s how to get Shopify's native tracking configured correctly.

Step 1: Activate inventory tracking

Log in to your Shopify admin. Navigate to Products and select a product. Scroll to the Inventory section and enable Track quantity. Repeat for each product or variant you want Shopify to monitor.

You can also view adjustment history per SKU which is useful for auditing unexpected stock movements.

Step 2: Choose your inventory policy

Shopify lets you decide what happens when a product hits zero. There are two options:

• Continue selling when out of stock - useful for made-to-order items or pre-orders
• Stop selling when out of stock - prevents overselling on items that can't be fulfilled

Step 3: Set up product variants

If your products come in multiple sizes, colours, or configurations, create variants in Shopify so each one tracks separately. This gives you granular visibility. Note that this also multiplies your forecasting complexity, since each variant has its own demand pattern and reorder point.

Step 4: Enter initial stock quantities

In the Inventory section of each product listing, enter your starting quantities. From this point forward, Shopify will decrement stock as orders are placed and increment it when purchase orders are received (if you're using Shopify's PO tools).

Part 2: Shopify's Native Inventory Features - and Their Limits

Shopify provides the essential tools most businesses need to manage day-to-day inventory. However, as your product range, order volume, and operational complexity grow, its limitations become more noticeable.

What Shopify does well

For early-stage or low-SKU stores, Shopify's built-in tools are useful in:

• Real-time stock visibility per product and variant
• Multi-location stock allocation - assign inventory to warehouses, retail stores, 3PLs, and fulfilment centres
• Transfer tracking between locations
• Basic inventory reports: average units sold per day, sell-through rates, ABC analysis, inventory snapshots
• Purchase order management for receiving stock (manual input required

Where Shopify falls short

As an inventory management system, Shopify falls short on certain aspects that might cost you as your business scales further.

No demand forecasting

Shopify shows you historical sales data. It does not predict future demand, account for seasonality, or factor in trend shifts.

No automated replenishment

Shopify cannot calculate reorder points dynamically or auto-generate purchase orders based on projected demand and supplier lead times. Every PO has to be built manually.

Fragmented multi-location planning

Shopify lets you assign stock to locations. But it doesn't tell you how much each location will need, when to rebalance between them, or how lead times differ by warehouse.

Limited analytics depth

Basic reporting is available, but Shopify doesn't surface metrics like inventory turnover ratio, weeks of stock remaining, dead stock identification, or forecast accuracy tracking.

No new product forecasting

Shopify's historical model means you are making wild guesses when forecasting for new products.

Part 3: Add Inventory Planning to Shopify with StockTrim

StockTrim connects directly to your Shopify store by pulling in your sales history, current stock levels, product variants, and location data. It adds the forecasting and planning layer without disrupting your workflow.

How does the integration work?

Connecting only takes minutes. Once linked, StockTrim syncs your data in real time and begins analysing demand patterns. From there, you get a planning environment that works with your existing Shopify setup.

When you receive purchase orders through StockTrim, updated inventory quantities are pushed back into Shopify automatically, keeping your stock records consistent.

What does StockTrim add to your Shopify setup?

Demand forecasting

StockTrim's machine learning algorithm analyses your sales history and identifies patterns — seasonal trends, growth trajectories, and demand shifts by SKU. It selects the best forecasting model for each product individually, rather than applying a one-size-fits-all calculation.

The result: order recommendations grounded in data, not intuition.

New product forecasting

One of StockTrim's standout capabilities is forecasting demand for products with no sales history. Rather than leaving you guessing, it uses demand patterns from similar products or product groups to simulate expected sales and generate initial order quantities.

For businesses launching new lines or entering new markets, this removes a significant blind spot.

Automated purchase order generation

StockTrim calculates the optimal order quantity for each SKU by:

• factoring in your current stock
• forecasting demand
• while considering varying supplier lead times and minimum order quantities

It then generates a draft purchase order ready for your approval.

Variable lead time management

Set your supplier lead times in StockTrim and forecasts recalculate instantly. When a supplier changes their delivery window, your reorder points and suggested quantities update automatically.

Multi-location planning

StockTrim adds location-specific forecasting to your Shopify multi-location setup. Rather than just seeing stock levels per warehouse, you can plan how much each location needs, accounting for regional demand differences, and generate location-specific order plans.

This addresses one of the most common pain points in multi-warehouse operations: overstocking in one location while running short in another.

Product variant and group forecasting

StockTrim imports your Shopify product variants and lets you forecast at both the variant level (individual sizes, colours, configurations) and the product group level (the full range). This gives you visibility over individual SKU needs and aggregate demand in one view.

Profitability ranking

Beyond volume, StockTrim helps you identify which products are most profitable so you can prioritise stock availability on high-margin items rather than just fast-movers.

Bill of materials for manufacturers and product bundles

If you manufacture finished goods or sell bundled products, StockTrim translates demand forecasts for finished items into component-level order requirements. It handles multi-level bills of materials, so you can see the downstream impact of a sales forecast on raw materials and sub-assemblies.

Part 4: Best Practices for Shopify Inventory Management

Good inventory management is not just about having the right software, building consistent processes is as important.

These best practices help businesses create a stronger foundation for growth.

1. Run regular stock audits

Shopify's tracking is only as accurate as the data feeding it. Regular physical counts (even partial cycle counts by category) catch discrepancies before they cascade into ordering errors.

2. Set clear reorder points per SKU

Don't wait until stock hits zero. Define the threshold at which replenishment should begin, factoring in lead time and average daily sales. If you're doing this manually in Shopify, it's a static number. With StockTrim, reorder points update dynamically as demand patterns change.

3. Track variants separately

Each variant has its own demand curve. Make sure Shopify is tracking variants individually (for e.g. 5 different sizes of the same product are 5 different variants), and that your planning tool is forecasting them separately.

4. Account for seasonality

Static historical averages do not capture seasonal spikes. If your business has peak periods such as holiday season, summer demand, annual events, your forecasting needs to weight recent trends and known seasonal patterns, not just trailing averages.

5. Define a supplier management process

Know your lead times per supplier and review them regularly. A supplier that changes from a 30-day to 60-day delivery without notice is a significant planning risk if your reorder points aren't updated to match.

6. Don't conflate inventory management and inventory planning

Shopify is your inventory management system. It tracks what you have. Inventory planning (forecasting what you should have, and when to order it) is a separate job. Treating your Shopify reports as a planning tool is what leads to stockouts and overstock.

Part 5: When to Move Beyond Shopify's Native Tools

Shopify works well as businesses get started, but growth often introduces new inventory challenges. Most merchants benefit from a dedicated planning tool when they hit these thresholds:

• More than 100 SKUs: manual reorder tracking becomes error-prone
• Multiple warehouse locations: location-specific demand differences require more than stock visibility
• Frequent stockouts or overstock: a signal that forecasting is reactive rather than proactive
• New product launches
• Variable supplier lead times: static reorder points create risk when lead times shift
• Time spent on purchasing: if your team is spending significant hours each week on manual order calculations, the process is costing more than a planning tool would

About StockTrim
StockTrim is the leading inventory planning and demand forecasting software built for SMBs. It connects natively with Shopify and turns your current sales data into purchase order recommendations.

Learn more here: https://www.stocktrim.com/lp3-526demo

Frequently Asked Questions

Does StockTrim replace Shopify?

No. StockTrim connects to Shopify and adds a forecasting and planning layer on top. Your Shopify store remains your source of truth for orders, customers, and stock levels. StockTrim tells you what to order and when — and pushes updated inventory quantities back to Shopify when purchase orders are received.

How long does setup take?

The integration typically takes a few minutes. Once connected, StockTrim imports your sales history and stock data and begins generating forecasts. Most users have actionable order recommendations within their first session.

Can StockTrim handle multiple Shopify locations?

Yes. StockTrim supports location-specific forecasting and order planning. You can generate separate recommendations for each warehouse, 3PL, or store location connected to your Shopify account.

What if I've just launched a new product with no sales history?

StockTrim can forecast new products by analysing demand patterns from similar products or product groups in your catalogue. You don't need historical data to get an initial order quantity estimate.

Does StockTrim handle product variants?

Yes. StockTrim imports variants from Shopify and forecasts at both the individual variant level (size, colour, configuration) and the parent product group level.

What does StockTrim cost?

StockTrim plans start from $49/month. A 14-day free trial is available, no credit card required.

See StockTrim in action

See how StockTrim can optimise your inventory workflow. Book a demo and our team will walk you through how it fits with your Shopify setup.