How to control minimum stock and reorder on time in your shop (2026)
Every empty shelf is a sale walking out the door, and every box gathering dust in the back is cash you cannot spend. Getting your minimum stock right is the quiet skill that keeps both problems away at once.
Why minimum stock decides your margins
There are two ways to get inventory wrong, and most shops swing between them. The first is the stockout: a customer comes in for the thing they always buy, it is not there, and they leave, often for good. You did not just lose that sale, you lost the basket that came with it and a bit of trust. The second is overstock: you over-ordered, the shelf is full, and now your money is frozen in product instead of working for you. With perishables or anything seasonal, overstock quietly turns into waste.
Minimum stock is the tool that keeps you in the narrow lane between those two ditches. It tells you the exact moment to reorder, so you refill before you run dry without piling up more than you can sell. Get it right across your best products and your shelves stay full, your cash keeps moving, and you stop guessing.
What minimum stock is and how to calculate it
Minimum stock, also called the reorder point, is the level at which it is time to place a new order. Not zero, not full: the precise threshold that gives the supplier enough time to deliver before you sell out. The formula is simpler than it sounds:
Minimum stock = (average daily sales × lead time in days) + safety buffer
Let us break down each piece:
- Average daily sales: how many units of that product you sell on a normal day. Take a few weeks of sales and divide.
- Lead time: how many days pass from placing the order until the goods are on your shelf. Three days, a week, whatever your supplier really takes.
- Safety buffer: a cushion for the unexpected, a busy weekend, a late delivery, a sudden run on one item. Usually a couple of extra days of sales.
An example. You sell 8 units a day of a popular drink. Your supplier takes 3 days to deliver, and you want a 2-day cushion. Your minimum stock is 8 × 3 + 8 × 2 = 40 units. The day your stock drops to 40, you order. By the time the delivery lands, you will still have a few units left and you will never have hit zero.
The buffer is not optional. Shops that skip the safety cushion run on demand and lead times being perfectly average forever, which never happens. One slow delivery or one unusually busy day and you are out. A small buffer costs almost nothing and saves the sales that matter most.
Not all products deserve the same attention: A, B and C
You probably stock hundreds or thousands of references. Trying to set a perfect minimum for every single one is exhausting and pointless, because they do not all matter equally. This is where ABC analysis earns its keep.
The idea comes from the old rule that a small share of your products drives most of your sales. Sort your catalogue into three buckets:
- A products: your top sellers and best-margin items. They are a minority of references but the majority of your revenue. These deserve tight, well-calculated minimum stock and careful watching.
- B products: the steady middle. Worth a minimum stock, but you can review them less often.
- C products: the long tail that barely moves. Here, a rough rule or reordering by eye is fine. Tying up cash and attention in these is wasted effort.
The payoff is focus. Instead of spreading yourself thin across everything, you put your control where it actually protects revenue: the handful of products you cannot afford to run out of.
Keep your best sellers in stock without drowning in slow movers
This is the real balancing act, and it is where ABC and minimum stock work together. For your A products, set a generous, well-calculated minimum and never let it slip. These are the items customers come in specifically for, the ones whose absence sends people to a competitor. A full shelf of best sellers is worth more than a full warehouse of everything else.
For your slow movers, do the opposite. Keep minimums low or order only when you actually run out. There is no prize for having forty units of something that sells one a month, just dust, expiry dates, and money you cannot use. The goal is a shop where the things people want are always there, and the things they rarely ask for take up as little cash as possible.
A quick gut check: if a product would hurt to be out of for even an afternoon, it is an A and needs a real minimum. If you would not even notice it was gone for a week, it is a C and does not.
Reordering on time: the routine that makes it work
A minimum stock number is useless if nobody acts on it. The point is to turn it into a smooth routine with three steps.
Once this loop runs every week, reordering stops being a panic and becomes a quiet habit. You are no longer reacting to empty shelves; you are refilling before anyone notices they were getting low.
Common mistakes that quietly cost you money
Even shops with good intentions fall into the same traps. Watch for these:
- Buying "by eye". Ordering on a hunch feels fast, but it is how you end up both out of best sellers and buried in things that do not move. Numbers beat gut feeling.
- Overstocking on supplier promos. "Buy ten, get two free" is only a deal if you can actually sell the twelve before they expire or go stale. Otherwise you just paid to store waste.
- Ignoring turnover. A product can look fine on the shelf and still be a slow drain on your cash. If you never check how fast each item sells, you cannot tell winners from dead weight.
- Not updating minimums by season. The minimum that was perfect in winter leaves you short in summer, and vice versa. Demand shifts with the calendar, promotions, and trends, so your thresholds have to shift too.
The promo trap is the sneakiest. A discount only saves money if it matches what you actually sell. Before doubling an order to hit a deal, ask whether you would have bought that quantity at full price. If the honest answer is no, the "saving" is really just slower cash and a fuller back room.
How Bipe helps
Bipe is built to make all of this automatic instead of a spreadsheet chore. You set a minimum stock per product, and Bipe watches it for you: when an item drops to its threshold, you get a low-stock alert so you reorder on time, every time, without checking shelves by hand.
Because every sale already discounts stock as you ring it up, and your catalogue runs on barcodes, your inventory stays close to reality between counts. You scan to sell and to adjust, and the numbers keep themselves honest. On top of that, turnover reports show you which products fly off the shelf and which just sit there, so your ABC sorting is based on real data, not guesswork, and you can update your minimums by season with confidence.
Per-product control means you decide where to be strict and where to relax: tight minimums on your A products, a lighter touch on the long tail. And on the paperwork side, electronic invoicing and Verifactu support are coming soon, so your shop stays ready for what is ahead without you having to think about it today.
Never run out of your best sellers again
With Bipe you set a minimum stock per product and get alerted the moment it is time to reorder. Try it free.
Try Bipe free →Frequently asked questions
How do I calculate the minimum stock for a product?
Multiply your average daily sales by the supplier's lead time in days, then add a safety buffer for surprises. For example, if you sell 8 units a day, the supplier takes 3 days, and you want a 2-day cushion, your minimum stock is 8 x 3 + 8 x 2 = 40 units. When you hit 40, it is time to reorder.
Should I set a minimum stock for every product?
No. Start with your A products: the ones that sell most or leave the best margin. Running out of those costs you real money. For slow movers it is fine to reorder by eye or keep a small minimum, so you do not tie up cash in stock that barely moves.
How often should I review my minimum stock levels?
Review them at least every season, and whenever sales clearly speed up or slow down. A minimum that was perfect in winter can leave you short in summer. Seasonal products, promotions, and new trends all change how fast you sell.
What is the difference between minimum stock and safety stock?
Safety stock is just the cushion: the extra units that cover delays or sudden demand spikes. Minimum stock (the reorder point) is the full trigger level: the stock you need to cover normal sales during the lead time plus that safety cushion. When you reach the minimum, you order.