Stock control numbers are the simple checks that show a retailer how fast goods are selling, how much profit each Naira tied up in stock is bringing back, and when stock is about to run out or turn into dead weight. For most Nigerian retailers, the numbers that matter most are:
- Stock turnover – how many times your stock sells and gets replaced in a year
- Sell-through rate – how much of what you bought has actually sold
- Return on stock money – how much profit each Naira in stock is earning you
- Cost of holding stock – what unsold goods are quietly costing you
- Stockout rate – how often your bestsellers are unavailable
- Days stock will last – how long current stock will last before you run out or it expires
- Dead stock percentage – how much of your stock hasn’t moved in months
Most shop owners only check two things: how much stock is left, and how much cash came in that day. That tells you what already happened. It doesn’t warn you before something goes wrong, and it’s why so many businesses get caught off guard by empty shelves on a busy day or a storeroom full of stock that won’t sell.
Here’s what that looks like in real life. It’s a Saturday afternoon, the busiest day of the week, and a customer asks for the same item three other customers asked for that morning. You’re out of stock, again. Meanwhile, in the storeroom, bags of last season’s stock haven’t moved in four months, quietly tying down money that could have gone into restocking what people actually want.
This is the everyday reality for retail businesses across Nigeria, from the provision store in Lagos to the boutique in Abuja to the phone accessories shop in Computer Village. And it’s rarely because the owner doesn’t care about the numbers. It’s because keeping track of seven different numbers, across dozens or hundreds of products, by hand, every single day, simply isn’t realistic. This article walks through what each number means, why doing it manually breaks down so quickly, and what it looks like once a system is tracking it for you instead.
Why Just Knowing “How Much Stock Is Left” Isn’t Enough
Many small business owners in Nigeria do a version of this: check the shelf, check the cash, and assume if money is coming in, things are fine. The problem is that this only tells you what already happened. It doesn’t warn you before something goes wrong, and checking it this way usually means flipping through a notebook or scrolling old WhatsApp messages to piece together what sold and what didn’t.
A shop can be making sales every single day and still be losing money quietly, because:
- Some of the best-selling items keep running out, and customers stop coming back for them
- Slow-moving stock is sitting there, eating up space and cash that should be working
- Stock is going missing, getting damaged, or being miscounted, and nobody is tracking it
- Money used to restock isn’t actually bringing back enough profit to be worth it
None of this shows up by glancing at a shelf or a cash drawer. It shows up in the numbers below, and those numbers only mean something if someone is actually keeping track of them, consistently, not just once a year during stock take.
The One Number Most Nigerian Business Owners Already Know: Stock Turnover
Stock turnover (also called inventory turnover) tells you how many times you sold and replaced your stock within a period, usually a month or a year. A higher number generally means your money is moving. A low number means stock is sitting on the shelf longer than it should, tying down cash that could be used elsewhere.
For example, a provision store that spends ₦2,000,000 restocking goods across the year, while keeping an average of ₦400,000 worth of stock on the shelf at any time, is turning that stock over about 5 times a year.
The problem is that getting an accurate stock turnover number means knowing your exact cost prices and your average stock value across every week of the year, not just a rough guess. Few shop owners have the time to add this up by hand, so the number either never gets calculated, or it gets calculated once a year, by which point any problem it could have flagged has already cost money. A system that records every sale and every restock as it happens can show you this number on any day you check it, not just at year end.
The Numbers Most Nigerian Retailers Are Missing
Sell-Through Rate
This tells you, out of everything you brought into the shop, how much you’ve actually sold within a set time. A fashion boutique in Abuja that brings in 100 pieces of a new ankara style and sells 65 within the first month has a 65% sell-through rate, a strong number for fashion items. If that same style only sells 20 pieces in a month, that’s 20%, a clear sign to mark it down or stop reordering it before it becomes dead stock.
Tracking this by hand means counting what’s left of every single product line, every week. That’s manageable with five products. It quickly becomes impossible with two hundred, which is why most retailers only notice a slow-moving item once it’s already been sitting for months.
Return on Your Stock Money
This number, sometimes called GMROI in business books, tells you how much profit you’re making for every Naira you have tied up in stock. Two products can sell the exact same quantity and still bring back very different profit, depending on their margins. Without checking this, it’s easy to cut the wrong product when money is tight, simply because it “moves slower,” when it’s actually the one quietly keeping the business profitable.
Working this out by hand means tracking exact profit margins per product over time, something most paper records and rough notebooks were never built to do cleanly. It’s one of the most valuable numbers in retail and one of the least tracked, purely because of how tedious it is to calculate manually.
The Real Cost of Holding Unsold Stock
Unsold stock isn’t just sitting there doing nothing. It’s costing you money in storage space, the risk of damage or spoilage, and the opportunity cost of cash that’s locked up instead of being used to restock fast-moving items. As a general guide, holding unsold stock typically costs a business between 20% and 30% of that stock’s value every year. So ₦1,000,000 worth of unsold stock could quietly be costing ₦200,000 to ₦300,000 a year.
Almost nobody sits down to calculate this by hand, because it means pulling together stock value, how long items have been unsold, and storage costs all at once. It’s the kind of number that only becomes useful when it’s calculated automatically, in the background, without anyone having to set aside an afternoon for it.
Stockout Rate:
This tracks how often your best-selling items are out of stock when customers come looking for them. A phone accessories shop that’s out of its most popular charger cable for 6 days out of a 30-day month has a 20% stockout rate, six days of customers possibly buying from a competitor down the road instead.
This is the hardest number on this list to track manually, because it requires knowing exactly which days an item was unavailable, for every product, not just the ones you happen to remember running out of. Without a system recording stock levels as they change, this number simply doesn’t exist for most businesses. It only shows up once it’s a recurring complaint from customers.
Days Your Stock Will Last
This tells you, at your current rate of selling, how many days your current stock will last if you don’t reorder anything. It matters most for perishable goods, like a supermarket’s fresh produce or a pharmacy’s stock with expiry dates. If you have 60 days’ worth of a product that expires in 45 days, that’s a problem worth catching early.
Working this out by hand means updating quantities and sales speed every single day for every product with an expiry date, which is realistic for a handful of items and unmanageable for a full inventory. A system that already knows your stock levels and sales pace can recalculate this automatically as you sell, no extra work required.
Stock Loss (Shrinkage):
Stock loss happens through theft, damage, spoilage, or simple counting errors. Across many retail businesses, stock loss typically falls between 1.5% and 2% of total sales every year. For a shop doing ₦20,000,000 a year in sales, that could mean ₦300,000 to ₦400,000 disappearing, often without anyone noticing until the next full stock count.
This is exactly the problem with relying on an annual stock take to catch it. By the time the count happens, the loss could have been building up quietly for months. A system that compares what should be in stock against what’s actually selling, continuously rather than once a year, catches this far earlier.
Dead Stock:
Dead stock is anything that hasn’t sold within a set period, usually 90 to 180 days. If 10% of your total stock value hasn’t moved in six months, that’s real cash sitting on a shelf instead of working for your business. Most shop owners only discover dead stock by accident, during an end-of-year count, by which point it’s usually too late to do anything but write it off as a loss.
Catching dead stock early means knowing the last-sold date of every single product, something that’s nearly impossible to keep up with on paper once a business carries more than a few dozen items.
How To Actually Use These Numbers, Not Just Know About Them
Knowing what these numbers mean only helps if you can act on them quickly. In practice, this means:
- Looking at stockout rate and dead stock together – If both are high at the same time, it usually means you’re buying the wrong amounts of the right things, not necessarily stocking the wrong products entirely.
- Setting a rule for yourself, in advance – Decide that if a product’s sell-through rate falls below 25% after a month, it gets marked down. If a bestseller’s stockout rate goes above 10% in a month, you increase how much you reorder. None of this requires complicated decision-making once the numbers are sitting in front of you. The hard part has never been deciding what to do. It’s finding the time to calculate the numbers in the first place, which is exactly the part most retailers skip.
- Checking return on stock money before a big purchase. Before placing a large order for a new season or festive period, check how much profit your last similar order actually returned. It changes how confidently you can spend.
What Stock Tracking Looks Like When You’re Not Doing It By Hand
Every number above is genuinely useful. The honest reason most Nigerian retailers don’t track them isn’t that they don’t see the value, it’s that calculating seven different numbers across an entire product range, every week, by hand, isn’t something any business owner has time for on top of actually running the shop.
This is the gap tools like SalesUnbox were built to close. Instead of pulling numbers together manually at the end of the month, a system that records every sale and every restock as it happens can show you stock turnover, sell-through rate, stockout rate, and dead stock automatically, updated in real time, without anyone sitting down to do the maths. The goal isn’t to replace your judgment as a business owner. It’s to put the numbers in front of you early enough to actually act on them, instead of finding out three months later that a bestseller was out of stock for half a week or that a corner of the storeroom has quietly turned into a loss.
Your stock has been talking. Time to start listening. Visit www.salesunbox.africa and run your shop like the boss retailer you are.
Frequently Asked Questions
What is stock control in a small business?
Stock control is the practice of tracking how much stock you have, how fast it’s selling, and how much it’s costing you to hold, so you can make better buying and selling decisions instead of guessing.
How do I know if my business is losing money from stock?
Check your stock loss percentage, your dead stock percentage, and the real cost of holding unsold stock. If these are high and you’ve never calculated them before, there’s a strong chance money is leaking somewhere you haven’t looked.
Why do Nigerian retailers run out of stock so often?
Most stockouts happen because reordering is based on guesswork or how the shop “feels,” rather than tracking actual stockout rate and sell-through rate per product. Without a system recording these as they happen, it’s nearly impossible to know exactly when to reorder a fast-moving item.
Do I need software to track stock control numbers?
You can track these manually with a notebook or spreadsheet if your product range is small. Once a business carries more than a few dozen products, manual tracking becomes time-consuming and error-prone, which is why most growing retailers move to a tool like SalesUnbox that calculates these numbers automatically as sales happen.
Final Thoughts
The number on a stock turnover spreadsheet is a summary, not the full story. The retailers who avoid the painful surprises, the empty shelf on a Saturday afternoon, the storeroom full of stock nobody planned for, aren’t necessarily the ones working harder. They’re the ones who aren’t doing this tracking by hand in the first place.
We built SalesUnbox after watching Nigerian retailers try to keep up with these numbers in notebooks, spreadsheets, and memory, and watching how much it cost them once stock problems caught up with them anyway. If you’d like to see what your own stock numbers are really telling you, without calculating any of it yourself, you can explore SalesUnbox here.
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