Excess inventory and stockouts are opposite sides of the same management failure. Excess inventory ties up cash in products sitting on shelves.
A business holding $50,000 in slow-moving inventory is effectively running a zero-interest loan to its suppliers at the cost of its own working capital. Stockouts lose sales to competitors and damage customer relationships that cost 5 to 25 times more to rebuild than to maintain. The goal of inventory management is the narrow band between those two failure modes: enough stock to meet demand without tying up capital that could be better deployed elsewhere.
Most small businesses that struggle with inventory management are running one of three broken processes:
- tracking inventory in spreadsheets that are not updated in real time
- ordering based on gut feel rather than reorder point calculations
- or buying in large quantities to chase unit cost savings without calculating the carrying cost of the excess inventory those savings purchase. All three are fixable with the right system and the right habits
What Inventory Software Actually Does
Purpose-built inventory software tracks stock levels in real time as sales are made.
Generates reorder alerts when stock reaches predefined thresholds. It provides visibility into which items move fast and which are sitting. Landed cost per unit, including freight and duties, is calculated automatically. Integration with point-of-sale and accounting systems means inventory value flows into your books without manual entry. The manual alternative, spreadsheets, clipboards, and periodic physical counts, provides a snapshot of inventory at the moment of counting and is wrong from the moment the next sale happens.
The Platforms by Business Type
Shopify includes inventory management in all plans ($29 to $299/month) and is the complete solution for e-commerce businesses that sell online. Stock levels sync across sales channels, low-stock alerts are configurable.
Inventory reporting shows sellthrough rates by product and variant. For pure e-commerce businesses, Shopify’s built-in inventory is sufficient through $1 to $2 million in annual revenue before needing a dedicated inventory add-on.
Lightspeed Retail ($89 to $269/month) is purpose-built for brick-and-mortar retail with complex inventory, multiple variants, suppliers, purchase orders, and multi-location stock management. The inventory management depth exceeds Shopify and Square significantly for retailers with large SKU counts, and the supplier management and purchase order workflows reduce the manual work of reordering substantially. Best fit:
- specialty retailers
- boutiques
- bike shops
- wine shops
- and any retail operation with 200+ SKUs that needs serious stock control
inFlow Inventory ($89 to $219/month) is the most capable standalone inventory management system for product-based businesses that sell through multiple channels and need serious stock control without a full retail POS. It handles purchase orders, multi-warehouse inventory, Bill of Materials for businesses that assemble or manufacture, and integrates with QuickBooks. Best fit:
- wholesalers
- distributors
- and manufacturers that sell B2B and need inventory management independent of a retail POS system
Cin7 and Fishbowl address more complex inventory environments, multi-location warehouses, 3PL integrations, EDI for selling to major retailers, and manufacturing BOMs. These are appropriate at revenue levels typically above $2 million and for businesses where inventory complexity has outgrown the tools above.
The Two Calculations Every Inventory Business Should Run
Reorder point = (average daily sales × lead time in days) + safety stock. A product that sells 5 units per day with a 10-day supplier lead time and 2 days of safety stock needs a reorder point of 62 units. When stock hits 62, the reorder happens automatically or by alert, not when someone notices the shelf is low. Most small businesses set reorder points intuitively rather than mathematically.
Produces both stockouts (underestimated lead time) and excess inventory (overestimated safety stock needs).
Inventory turnover = cost of goods sold / average inventory value. A business with $200,000 in COGS and an average $50,000 inventory balance has a 4x annual turnover, inventory turns over every 90 days. Industry benchmarks vary.
For most product businesses, turnover below 4x annually signals excess inventory carrying costs. Products turning less than 2x annually are candidates for liquidation, discontinuation, or supplier renegotiation. Running this calculation quarterly by product category, not just in aggregate, surfaces the specific items consuming working capital disproportionately.
