Managing Your Inventory: Never Run Out Without Overstocking
Stockouts mean lost sales and unhappy customers. Overstocking means tied-up cash and the risk of spoilage. Finding the right balance is an art. Here's the method.
The two enemies of perfect inventory
Too little stock → stockout → the customer goes to a competitor instead. Too much stock → cash tied up → products expire → straight loss.
The goal of good inventory management is to always keep just enough — no more, no less. It sounds obvious, but few shop owners have a structured method to achieve it.
Key indicators to track
Inventory turnover
This is the number of times an item "turns over" during a given period.
Turnover = Quantity sold over the period ÷ Average stock over the period
High turnover (a fast-selling product) → order regularly in small quantities. Low turnover → cut back your restocking, or remove the product from your range.
Safety stock
This is the "buffer" stock you keep to absorb unexpected events: a delayed supplier, an unexpected demand spike, a cancelled order. It's calculated as follows:
Safety stock = (Maximum supplier lead time − Average supplier lead time) × Average daily sales
Example: if your supplier normally delivers in 7 days but can take up to 14, and you sell 10 units a day → safety stock = 7 × 10 = 70 units.
Reorder point
This is the stock level at which you trigger a new order — before you dip into your safety stock.
Reorder point = (Average supplier lead time × Daily sales) + Safety stock
The ABC method for prioritizing
Not all products deserve the same attention. The ABC method segments your range:
- Category A (20% of items, 80% of revenue): your best-sellers. Track stock daily, order frequently, keep a comfortable safety stock.
- Category B (30% of items, 15% of revenue): important but not critical products. Weekly review.
- Category C (50% of items, 5% of revenue): niche products. Order in small quantities, restock on demand.
Managing perishable products
This is the main challenge for Afro-Caribbean grocery and food shops. A few rules:
- FIFO (First In, First Out): the products that arrived first should leave first. Always place new stock behind older stock.
- Track expiry dates: get ahead of short shelf lives with promotions or in-store tastings rather than waiting for spoilage.
- Order fresh products 2 to 3 times a week rather than one large monthly order.
Tools for managing your inventory
You don't need expensive software to get started:
- A physical stock sheet on each shelf: simple, but requires discipline
- Google Sheets: a table with item names, current quantity, reorder point, supplier
- POS software with inventory management (Lightspeed, iZettle, SumUp POS): the register updates stock automatically with every sale — the best investment for an active shop
Regular stocktaking: essential
Even with good software, discrepancies happen (theft, breakage, entry errors). Do a full stocktake at least once a quarter, and rolling counts (by shelf) every week. It's the only way to know what you actually have in stock.
