The verdict in three sentences
In e-commerce your inventory is frozen cash: every unsold unit carries a holding cost of 15 to 25 % per year (warehouse rent, tied-up capital, breakage, obsolescence). Fulfillment — receiving, pick-pack, shipping — typically eats 8 to 15 % of revenue when poorly managed. The right balance comes from fast turnover, a stockout rate under 5 %, and outsourcing to a 3PL once your volume passes the break-even point of in-house handling.
The hidden cost of owning inventory
Storing is never free. Here's the holding-cost breakdown for a mid-size Nairobi store.
| Inventory cost component | 2026 order of magnitude |
|---|---|
| Warehouse rent (per m²/month) | 800 - 1,800 KES |
| Tied-up capital (opportunity cost/yr) | 10-15 % |
| Breakage / theft / shrinkage | 2-4 % |
| Obsolescence (fashion, tech) | 3-8 % |
| Inventory insurance | 0.5-1 % |
| Total holding cost/year | 15-25 % of inventory value |
Inventory valued at 1,500,000 KES therefore costs you 225,000 to 375,000 KES/year just to exist. Hence the importance of turnover.
Stockout, overstock and turnover
Two symmetrical mistakes: too little stock (stockout = lost sales) or too much (overstock = frozen cash). Turnover measures how many times you sell through your inventory per year.
| Metric | Red zone | Healthy zone | Excellent zone |
|---|---|---|---|
| Stockout rate | > 10 % | 3-5 % | < 3 % |
| Inventory turnover (per year) | < 3 | 4-6 | > 8 |
| Days of stock | > 120 | 60-90 | < 45 |
| Overstock rate | > 25 % | 10-15 % | < 10 % |
| Margin eaten by fulfillment | > 15 % | 8-12 % | < 8 % |
Each stockout on a popular product costs not just the sale but the customer: up to 30 % never return after a stockout.
In-house or 3PL: the tipping point
Handling it yourself is cheaper at low volume; beyond a threshold, a 3PL becomes more profitable and frees your time.
| Line item | In-house | Outsourced 3PL |
|---|---|---|
| Fixed monthly cost | 45,000 - 120,000 KES | 0 (pay per use) |
| Pick-pack per order | ~staff time | 120 - 270 KES |
| Storage (per m²/month) | own rent | 1,000 - 1,800 KES |
| Profitable below | ~300 orders/month | — |
| Profitable above | — | ~300-400 orders/month |
Mini case study
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Joseph runs an accessories store in Nairobi, inventory valued at 1,200,000 KES, 250 orders/month. In-house, his annual holding cost (20 %) reaches 240,000 KES, plus a logistics employee at 35,000 KES/month, i.e. 420,000 KES/year. He cuts inventory by 30 % by improving turnover (from 4 to 6 turns/year), freeing 360,000 KES of cash, and shifts pick-pack to a 3PL at 180 KES/order (45,000 KES/month). Result: less frozen cash, fulfillment margin cut from 14 % to 9 %.
FAQ
How do I calculate my inventory turnover?
Divide the cost of goods sold over the year by the average inventory value. A result of 6 means you renew your whole stock 6 times a year — aim for 4 to 8.
When should I outsource to a 3PL?
Generally above 300 to 400 orders/month, when the fixed in-house cost exceeds the 3PL's variable cost (120 to 270 KES/order).
How do I reduce overstock without breaking margin?
Targeted promotions on slow-moving SKUs, pre-orders on new items, and ABC analysis to concentrate cash on the 20 % of products that drive 80 % of sales.
Does storage really cost 20 % a year?
It's an order of magnitude including rent, tied-up capital, breakage and obsolescence. For fashion or tech, obsolescence can push this figure above 25 %.
Do I need inventory software?
From 50 SKUs and 100 orders/month, a tool that syncs stock, stockout alerts and orders prevents lost sales and saves several hours per week.
Let's talk about your project. We connect your store to clear inventory management and fulfillment sized to your volume. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
