Inventory management is the invisible foundation of e-commerce. Get it right and orders flow smoothly. Get it wrong and you either lose sales to stockouts or lose money to unsold inventory.
Inventory Management Fundamentals
ABC Analysis
Categorize products by revenue contribution:
- A items (20% of products, 80% of revenue): Monitor daily. Never run out. Keep generous safety stock.
- B items (30% of products, 15% of revenue): Monitor weekly. Keep moderate safety stock.
- C items (50% of products, 5% of revenue): Monitor monthly. Keep minimal stock or dropship.
Reorder Points
Set automatic reorder alerts for each product based on sales velocity and supplier lead time. Formula: Reorder Point = (Average Daily Sales x Lead Time) + Safety Stock.
Safety Stock
Extra inventory to cover demand spikes and supply delays. For A items, keep 2-4 weeks of safety stock. For B items, 1-2 weeks. For C items, minimal or none.
Multi-Channel Inventory
If you sell on your website, Amazon, and eBay, inventory must sync across all channels in real-time. Overselling (selling the same item twice) destroys customer trust. Use a centralized inventory system that updates all channels simultaneously.
Seasonal Planning
Review last year sales data to predict seasonal demand. Order holiday inventory 8-12 weeks in advance. Plan clearance strategies for post-season inventory. Michigan businesses should account for weather-related demand patterns.
Need help with inventory management systems? Contact us for e-commerce operations consulting.
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Tony Paris
Founder and Tech Wizard at AppWT Web & AI Solutions. With over 29 years of experience in web development, Tony helps businesses succeed online through custom websites, SEO, and AI integration.
Learn more about TonyFrequently Asked Questions
What is the cost of a stockout?
Beyond the immediate lost sale, stockouts cause 21-43% of customers to buy from another agency instead. If the product is listed as out of stock, it can also hurt your search rankings as Google sees it as a poor user experience.
What inventory management system should I use?
For small stores (under 500 SKUs): Your e-commerce platform built-in system. For growing stores (500-5,000 SKUs): TradeGecko or inFlow Inventory. For multi-channel (5,000+ SKUs): Cin7 or Brightpearl.
How do I calculate reorder points?
Reorder Point = (Average Daily Sales x Lead Time in Days) + Safety Stock. Safety stock is typically 20-30% above the calculated minimum to account for demand spikes and supply delays.
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