eCommerce Operations Guide
One client lost $40K in sales during BFCM because they ran out of their top product. Don't be that client.
Inventory management is the least sexy topic in eCommerce and the one most likely to put you out of business. Stockouts mean lost sales, disappointed customers, and wrecked ad campaigns you can't shut off fast enough. Overstocking means cash tied up in warehouse shelves, storage fees eating your margins, and products going stale or out of season.
Most store owners manage inventory by gut feel. They look at what sold last month, order roughly the same amount, and cross their fingers. That works until you run a successful promotion that sells out your top SKU, or a supplier delay pushes your restock date back three weeks, or a seasonal shift tanks demand for half your catalog.
Proper inventory management isn't complicated — it's a system. Demand forecasting, reorder points, safety stock, and regular reviews. Here's how to set it up so you stop guessing and start planning.
$40K
Lost in One Client's BFCM Stockout
43%
Small Businesses Don't Track Inventory
150+
Stores We've Advised
20-30%
Cash Flow Saved by Proper Planning
How to fix this — step by step
Know your numbers for every SKU
For each product, you need to know: average daily sales, lead time (days from order to delivery), landed cost, current stock level, and sell-through rate. Pull this from Shopify Analytics or your inventory management tool. If you can't answer "how many days of stock do I have for my top 10 products?" right now, that's your first problem.
Set reorder points and safety stock levels
Reorder point = (average daily sales x lead time) + safety stock. Safety stock = average daily sales x buffer days (typically 7-14 days). Example: you sell 10 units/day, lead time is 21 days, safety stock is 10 days. Reorder point = (10 x 21) + (10 x 10) = 310 units. When your stock hits 310, place the reorder. This formula prevents stockouts while keeping inventory lean.
Forecast demand using data, not gut feeling
Look at the last 12 months of sales data by SKU. Identify seasonal patterns, growth trends, and promotional spikes. Apply a growth rate if your business is growing. Factor in planned promotions and marketing campaigns. For BFCM, order 3-4x your normal monthly volume for top sellers. A spreadsheet works fine at first — dedicated inventory tools like Stocky (Shopify), Inventory Planner, or Cin7 make it easier as you scale.
Implement an ABC analysis to prioritize
Not all products deserve the same attention. A items (top 20% of SKUs, 80% of revenue) get the most careful forecasting and highest safety stock. B items (next 30%, 15% of revenue) get standard tracking. C items (bottom 50%, 5% of revenue) get minimal stock. Stop tying up cash in C items while your A items risk stockouts.
Review and adjust monthly
Every month, review: which SKUs sold faster or slower than expected, which products are approaching dead stock (90+ days no sales), what promotions or marketing campaigns are coming that will affect demand, and whether lead times have changed. Update your reorder points and safety stock levels accordingly. Inventory management is a living system, not a set-and-forget calculation.
Want us to handle this?
These five steps will bring structure to your inventory management and prevent the stockouts and cash flow problems that kill growing eCommerce businesses. You can set this up in a weekend.
But inventory management connects to everything else: your marketing calendar affects demand, your email campaigns drive purchase timing, and your ad spend determines traffic volume. We look at operations as part of the full revenue strategy. If you want us to review your operations alongside your marketing, that conversation is free.
Questions our best clients asked first
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