How to Improve Inventory Management: A 30-Day Plan for Sellers
Quick answer: To improve inventory management, measure before you change anything: how accurate your stock records are, how often bestsellers run out, how fast each SKU sells, how much stock hasn't moved in months and how much cash is sitting on shelves. Then fix the basics in order: one clean SKU list, ABC classes so your best products get the most attention, reorder points built on measured lead times, receiving rules that catch errors at the door, regular cycle counts and written limits for slow stock. Most small stores don't need new software for this. They need a routine, and the plan below sets one up in about 30 days.
Day 1: check five numbers
| Number | How to measure it | What you want to see | If it's bad, start with |
|---|---|---|---|
| Record accuracy | Count 20 random SKUs; share whose physical count matches the record exactly | Nearly all of them match | Receiving and returns (week 4) |
| Stockout days | Days your top SKUs were unavailable in the last 90 days | Zero, or close to it | Reorder points (week 3) |
| Sell-through by SKU | Units sold ÷ units received, per period | In line with what you planned when you bought | ABC classes (week 2) |
| Dead stock | Value of stock with no sale in 90 days ÷ total stock value | Small and shrinking | Slow-stock rules (after day 30) |
| Cash in stock | Units on hand × landed cost per unit | A number you know every week | ABC classes and buy discipline |
Write the five results down. You will measure them again on day 30, and the difference is how you know the plan worked.
Week 1: clean your SKU data
Every other fix depends on this one. Inventory goes wrong fastest when the same product has two codes, or two variants share one.
- One SKU per sellable variant. Red/medium and red/large are two SKUs.
- The same SKU everywhere: store, warehouse and your purchase orders. Map each supplier's product code to your SKU once, in one sheet.
- Record per SKU: supplier, units per carton, landed cost, measured lead time, and whether it ships in its own packaging.
- Retire duplicates and dead listings so they stop showing up in counts and reports.
Our guide to SKUs in inventory management covers barcodes, Amazon FNSKUs and multi-warehouse codes in more depth.
Week 2: sort products into A, B and C
ABC analysis ranks SKUs by how much they contribute, so you can spend attention where it pays. Rank by gross profit, not revenue: a product with high sales and a thin margin should not crowd out a quieter one that earns more.
- Export the last 90 days of unit sales per SKU.
- Multiply each by gross profit per unit (price minus landed cost).
- Sort from highest to lowest and add a running total as a percentage of all gross profit.
- Class A is the top group that makes up most of the profit, class B the middle, class C the long tail.
Here is how it might look for a store with 50 SKUs (the split is an example; yours will differ):
| Class | SKUs (example) | Share of gross profit (example) | How to manage it |
|---|---|---|---|
| A | 8 | 70% | Review stock weekly, hold safety stock, count monthly, never let it run out |
| B | 15 | 22% | Review every two weeks, count quarterly, modest safety stock |
| C | 27 | 8% | Buy small or only on demand, count twice a year, first candidates to drop |
Class C is where cash quietly disappears. A C item bought at a factory's minimum order quantity "because the unit price was better" can sit for a year. For many C items, buying after each customer order is cheaper than holding any stock at all.
Week 3: set reorder points from real lead times
A reorder point is the stock level at which you place the next order. The formula is simple: daily sales × (lead time in days + safety days). The hard part is the lead time. Measure it from the day you place the purchase order to the day stock is counted and sellable, including production, delivery, inspection and any freight to an overseas warehouse. Our 3PL supply chain guide adds up each step, and our Amazon order management guide works a full example for FBA stock.
Set reorder points for class A first, then B. Raise safety days ahead of Chinese New Year, when factories stop for weeks, and before your own big promotions.
Week 4: stop errors at the door, then count
Most record errors enter in three places: receiving, returns and picking. Fix receiving first, because one wrong count there carries into every report after it.
- Ask suppliers to mark your purchase order number on every carton and send a packing list ahead.
- Count every delivery against the purchase order, and record shortfalls the same day.
- Inspect before the stock is marked sellable, not after a customer complains.
- Process returns within a fixed number of days and record each one as restocked, repaired or written off.
Then replace the yearly stock-take with cycle counts: a few SKUs counted every week, so every SKU is covered on a schedule. A sensible starting cadence is class A monthly, B quarterly and C twice a year. When a count doesn't match, find the cause before you correct the number; otherwise the same error returns next month.
After day 30: limits for slow stock
Decide in advance what happens to stock that stops moving, so it isn't left to mood. One possible set of thresholds:
| No sale for | Action |
|---|---|
| 60 days | Check the listing, photos and price; try bundling it with a class A product |
| 90 days | Stop reordering; discount it |
| 120 days or more | Clear it: deeper discount, liquidation or donation, and drop the SKU |
Adjust the days to your category; seasonal goods need their own rules, covered in our seasonal inventory guide. Storage cost belongs in the decision too, and it depends on where the stock sits. See short-term vs long-term storage.
Mistakes that undo the work
- Counting everything once a year and trusting the records in between.
- Ranking products by revenue instead of gross profit.
- Buying class C items at minimum order quantities to save a few cents a unit.
- Letting returns pile up uncounted.
- Holding stock in several places without one combined count.
How PackQuay helps
We receive, count and inspect your goods at our own warehouse in Xinxiang, Henan, with 20% of each batch checked free and extra inspection at $7 per person per hour. Storage is free for your first 2 months and free while you have orders to process; long-term storage is priced per CBM. For class C products, there is a no-stock option: we buy after your customer pays, in 4–5 days on average, so you hold nothing. Message us on WhatsApp and we connect your Shopify or WooCommerce store for you: orders come in automatically, and tracking numbers go back to your store once parcels ship. You can also send orders as a CSV or Excel file.
FAQ
How can I improve inventory management quickly?
Measure five numbers first: record accuracy, stockout days, sell-through, dead stock and cash in stock. Then clean your SKU list, sort products into ABC classes, set reorder points for your top sellers from measured lead times, and tighten how deliveries and returns are counted.
What is ABC analysis in inventory management?
A way of ranking SKUs by how much they contribute, best done by gross profit. Class A is the small group that earns most of the profit and gets the closest control, class B the middle, and class C the long tail that gets the least stock and attention.
How often should I count my inventory?
Use cycle counts instead of one yearly stock-take. A common starting point is class A SKUs monthly, class B quarterly and class C twice a year, plus a count whenever a record looks wrong.
What should I do with dead stock?
Set thresholds in advance. For example, after 60 days without a sale review the listing or bundle it, after 90 days stop reordering and discount, and after 120 days clear it and drop the SKU. Factor in the storage cost of keeping it.
Do I need inventory management software?
Not at the start. A clean SKU list, a shared stock sheet and a weekly routine cover a small store. Software becomes worth it when you have many SKUs, several sales channels or stock in more than one warehouse.