“I want to start managing inventory, but where do I begin?” This is a beginner-friendly guide to the purpose, main tasks, basic steps and flow of inventory management. By the end, you should have a clear picture of what to do at your company starting tomorrow.
What is inventory management?
Inventory management is the set of activities for correctly grasping “what you have, where, and how many,” and keeping it neither short nor excessive. It is not just counting — the goal is to prevent stockouts and excess and to maximize profit.
“Inventory” here means more than just products for sale.
- Products / merchandise: what you hold to sell or provide services
- Raw materials / parts: what you use in manufacturing or construction
- Consumables / supplies: materials, packaging, medical supplies, tools and so on
In accounting terms, inventory is a company asset. Inventory management is really the management of money in another form — an activity that directly affects the business.
Why inventory management matters
Without proper inventory management, problems like these arise.
- Stockouts: running out loses sales and trust. For example, missing 10 sales a month of a ¥5,000 product with a 30% gross margin costs you about ¥180,000 of profit per year — and if stockouts become chronic, the cost of customers leaving is far larger.
- Excess stock: cash gets tied up in stock and cash flow suffers. Storage space and handling grow, and stock that doesn’t sell eventually deteriorates or becomes obsolete — ending as write-offs.
- Stock discrepancies: the books and the physical count don’t match, and finding the cause takes time. Large discrepancies also undermine the reliability of your accounts.
Stockouts and excess are a trade-off, and balancing them on gut feel alone is hard. That is exactly why inventory management based on records and numbers is necessary.
The main tasks of inventory management
“Inventory management” is really a combination of tasks like these.
| Task | What it involves |
|---|---|
| Inbound management | Inspect and record quantities of purchased/received goods |
| Outbound management | Record quantities sold, shipped or used |
| Transfers / adjustments | Moves between sites or locations, and corrections for damage or loss |
| Stocktaking | Count physical stock, reconcile against the books and fix discrepancies |
| Ordering | Decide replenishment timing and quantity based on reorder points and appropriate stock |
| Analysis / improvement | Use inventory turnover and ABC analysis to spot best sellers and dead stock, and refine operations |
When these run day after day as one cycle, “what, where and how many” stays correct at all times.
The basic steps of inventory management
You can start without strain by following these five steps.
Step 1: Build a product master
Decide the rules for product names, SKUs (product codes) and units, and list the products you manage.
- SKU example: “TS-WH-M” = T-shirt, white, size M — make each color/size its own SKU.
- Align units: mixing “boxes” and “units” always causes gaps. Fix the pack quantity (1 box = 12 units, etc.) and standardize which one you count in.
Aligning the rules first is the single biggest key to avoiding later confusion. → Managing products
Step 2: Record stock movements
Record inbound (purchase/receipt), outbound (sale/shipment) and adjustments on the spot, every time, to keep stock counts current. “Jot it down and enter it later” is where omissions and duplicates breed.
Where needed, separate stock by lot or expiry date, and enforce first-in-first-out (FIFO). → Actions (inbound, outbound, adjustment, stocktaking)
Step 3: Reconcile with stocktaking
Count physical stock regularly and correct the gap against the books (stock discrepancy). Once a year is required for the accounts, but that alone makes causes hard to trace — combining monthly stocktakes or cycle counting (counting a portion at a time, key products first) is recommended. → What is stocktaking
Step 4: Set appropriate stock levels
Set a level per product that avoids both shortage and excess (a worked example follows in the next section). The ideas of safety stock, the reorder point and appropriate inventory help here.
Step 5: Analyze and improve
Use inventory turnover and ABC analysis to spot best sellers and dead stock, and revisit your settings and ordering. The numbers you set in step 4 are not “set and forget” — update them regularly against actual results.
Appropriate inventory in practice (with a worked example)
The most fundamental formula is the reorder point.
Reorder point = average daily outbound × replenishment lead time + safety stock
Say a product ships 20 units per day on average, the lead time from order to receipt is 5 days, and you hold 30 units of safety stock as insurance against stockouts —
Reorder point = 20 units × 5 days + 30 units = 130 units
The rule becomes: when stock falls below 130 units, place an order. The 100 units you’ll sell during the lead time are covered until replenishment arrives, and demand swings are absorbed by the 30 units of safety stock.
The rigorous calculation of safety stock (demand variability × a safety factor) is covered in What is safety stock. Even a rough figure is fine at first — having a numeric baseline per product is the first step in graduating from gut feel.
Your options for how to manage inventory
There are three broad methods.
| Method | Characteristics | Suited to |
|---|---|---|
| Paper / handwriting | Easy to start, but totaling, sharing and searching are hard, and errors are common | Very small or temporary |
| Excel (spreadsheets) | Free and flexible, but weak at simultaneous editing, real-time updates and mobile use | Small, few operators |
| Inventory system | Automates recording, alerts and totaling; easy to share across people and sites | Small to mid-size, growth phase |
It’s common to start with Excel and consider moving to a system when signs like these appear.
- SKUs grow past several hundred and managing/searching the file becomes painful
- Multiple people or sites need to see the same stock data
- Discrepancies won’t go down at each stocktake (structural omissions and transcription errors)
- You want to check and record from a phone on the floor
→ See The limits of Excel inventory management
Common mistakes and how to fix them
| Common mistake | Fix |
|---|---|
| Recording rules differ by person; the same product gets registered under different names | Document the product master and rules (codes, units, when to record) and have everyone follow them |
| “I’ll enter it all later” leads to omissions and duplicates | Record on the spot at each action; use barcode scanning to reduce the input effort itself |
| Stocktaking happens only once a year, so causes of discrepancies are untraceable | Combine monthly stocktakes and cycle counting to catch discrepancies early and kill the causes |
| Only counts are managed, never value | Track cost, inventory asset value, gross profit and turnover, and feed them into ordering and cash-flow decisions |
| Stock knowledge lives only in one person’s head | Share in the cloud so anyone sees the same up-to-date data |
What you can do with the inventory system “KURAPRO”
The cloud inventory management system “KURAPRO” lets you systematize these basic steps all at once.
- Record inbound, outbound, adjustment and stocktaking and stock updates automatically. Supports barcode scanning on a smartphone.
- Set minimum and maximum stock levels per product and see shortages and excess in stock alerts.
- Total inbound/outbound, sales and gross profit by period and product in reports.
- Also supports management by location, lot and expiry date, CSV import and member sharing.
For the full picture, see What you can do with KURAPRO.
Frequently asked questions about inventory management
Q. Where should I start?
Start by building your product master. Decide the rules for product names, product codes (SKUs) and units, and list the products you will manage. With that foundation, record every inbound and outbound movement as it happens, and reconcile with regular stocktaking.
Q. Which is better, Excel or an inventory management system?
With few products and a single operator, Excel can work fine. Once you pass several hundred SKUs, need multiple people or sites on the same data, or discrepancies won’t go down, it’s time to consider a system.
Q. How often should I do stocktaking?
At least once a year for the accounts. Because that alone makes causes hard to trace, combining monthly stocktakes or cycle counting — key products first — is recommended.
Q. How do I calculate appropriate inventory or a reorder point?
The basic formula is “reorder point = average daily outbound × lead time + safety stock.” With 20 units/day, a 5-day lead time and 30 units of safety stock, the reorder point is 130 units.
Q. Can I manage products without barcodes?
Yes. Assign your own product codes and print QR-code or barcode labels, and even products without retail barcodes — including your own products — can be managed by scanning. Operating by name search with no codes is possible too.
Summary
- Inventory management is the activity of correctly grasping stock and keeping it neither short nor excessive — protecting profit and cash efficiency by preventing stockouts, excess and discrepancies.
- The work is a combination of inbound, outbound, transfers/adjustments, stocktaking, ordering and analysis.
- The basics are the five steps of “product master → recording movements → stocktaking → setting appropriate inventory → analysis.”
- A reorder point can be estimated as “average daily outbound × lead time + safety stock.”
- Methods are paper, Excel and a system; growing SKUs, people and sites are the sign to move to a system.
With KURAPRO, you can start all of this inventory management using nothing but your smartphone’s barcode scanner. Try it now on the free plan.
