Raw material inventory management is the process of recording what materials enter your business, where they are stored, how much production consumes, and when each item must be reordered. A reliable system connects purchases, stock, the Bill of Materials (BOM), production and finished goods so that every movement can be traced.
For a small manufacturing business, poor raw-material control creates two opposite problems. Too little stock can stop production. Too much stock locks working capital into material that may sit unused, expire or become obsolete. The answer is not simply buying more stock; it is creating a repeatable process that keeps the physical store and the stock record aligned.
What counts as raw-material inventory?
Raw-material inventory includes the ingredients, components and packaging consumed to make a finished product. Fabric, thread and buttons are raw materials for a garment unit. Oils, fragrances, bottles and labels are raw materials for a cosmetics manufacturer. Steel sheets, fasteners and paint are raw materials for a fabrication workshop.
Keep it separate from:
- Work in progress (WIP): material that has entered production but is not yet a finished product.
- Finished goods: completed products ready for sale.
- Consumables and MRO supplies: items used to operate or maintain the business but not normally included in the finished product.
This separation matters because each category moves differently and answers a different business question.
The seven-step raw-material inventory process
1. Create one item record for every material
Give every material a unique name or SKU. Record its unit of measurement, supplier, purchase rate, storage location, minimum level and opening quantity. Use one standard unit for each item. Mixing kilograms, grams and packets without defined conversions is a common source of stock errors.
| Field | Example | Why it matters |
|---|---|---|
| Material code | RM-ALOE-001 | Prevents duplicate records |
| Material name | Aloe vera gel | Makes reports understandable |
| Stock unit | kg | Keeps quantities consistent |
| Storage location | Rack B-03 | Helps staff find and count it |
| Preferred supplier | Supplier A | Speeds up replenishment |
| Reorder level | 20 kg | Triggers action before a stockout |
2. Record every receipt when material arrives
Do not wait until the end of the week to update purchases. When a delivery arrives, check the supplier document against the material received, inspect the quantity and condition, and record the receipt immediately. Include the date, supplier, reference number, quantity, rate and tax details that your accounts process requires.
If accepted and rejected material are placed together, the stock figure becomes misleading. Keep rejected, damaged or inspection-pending stock in a separate location and status.
3. Connect every product to a Bill of Materials
A manufacturing inventory system needs to know what each finished product consumes. The BOM lists the standard quantity of every material required for one unit or one production batch.
For example, if a batch of 100 bottles requires 25 kg of base material, 2 kg of fragrance, 100 bottles and 100 labels, the production record should deduct those quantities when the batch is completed. Without a BOM, raw-material consumption depends on manual estimates and delayed entries.
4. Record material issues and production consumption
Every movement from the store to production should have a reference: a batch, job, work order or production entry. This creates an audit trail and lets you compare expected consumption with actual consumption.
Record normal usage separately from wastage, samples, damage and returns. If all reductions are posted as “production use,” you cannot see where material is being lost.
5. Set practical reorder levels
A simple starting formula is:
Reorder level = expected material use during supplier lead time + safety stock
Suppose a workshop uses 10 kg of Material A per day, and the supplier normally takes six days to deliver. Expected lead-time use is 60 kg. If the business keeps 20 kg as safety stock, the initial reorder level is 80 kg. Use our raw material reorder level formula guide to compare calculation methods and work through more examples.
Safety stock protects against variation in demand and supply, but it should not be an arbitrary number copied across every item. Review supplier reliability, usage variation, minimum order quantity, shelf life and the consequence of a stockout. The Association for Supply Chain Management explains that safety stock exists to protect against demand and supply fluctuations and should reflect variability rather than a single rule of thumb.
6. Count important materials regularly
Do not rely only on a year-end physical count. Use cycle counting: count a small set of items on a regular schedule, compare the physical quantity with the system quantity, and record the reason for each difference.
- Count expensive, fast-moving or production-critical items more frequently.
- Count stable, inexpensive items less frequently.
- Investigate differences before making an adjustment.
- Track recurring reasons such as wrong units, unrecorded issues, damage or duplicate receipts.
7. Review exceptions, not just total stock value
A useful daily view highlights materials below their reorder level, items with no recent movement, rejected stock, negative balances and production batches that cannot start because something is short. These exceptions lead to action. A single total inventory value does not tell the production team what to buy today.
How do you prevent production from stopping because raw materials are missing?
Prevent production stoppages by checking every planned batch against its Bill of Materials before work begins. Compare the required quantities with usable stock, open purchase orders and safety stock. If any component is short, create the purchase requirement before releasing the batch instead of discovering the shortage on the production floor.
- Use an accurate Bill of Materials for every finished product.
- Multiply each BOM quantity by the planned production quantity.
- Compare the requirement with available stock before approving the batch.
- Use reorder levels and supplier lead times to buy critical materials early.
How does inventory software deduct raw materials when a product is built?
Inventory software links a finished product to its BOM. When a production batch is recorded, the system multiplies the standard material quantity by the number of units produced, deducts those inputs from raw-material stock and adds the completed quantity to finished-goods stock. Wastage, returned material and actual consumption should be recorded separately so the movement history remains explainable.
This removes the need to subtract the same components manually from several spreadsheet rows. If your team is deciding when to make that change, compare Excel inventory with inventory management software.
Want to check material availability before production starts? Drafto connects raw materials, BOMs, production batches and finished-goods stock in one offline system for small Indian manufacturers.
A worked example
A small personal-care manufacturer starts with 120 kg of liquid base. It receives 50 kg from a supplier, issues 30 kg to Batch 024, records 2 kg of process loss and returns 3 kg of unused material from production.
| Movement | Quantity | Running stock |
|---|---|---|
| Opening stock | 120 kg | 120 kg |
| Purchase receipt | +50 kg | 170 kg |
| Issued to production | −30 kg | 140 kg |
| Unused material returned | +3 kg | 143 kg |
| Recorded process loss | −2 kg | 141 kg |
The closing stock is 141 kg. More importantly, the business can explain every movement. If a physical count shows 137 kg, the four-kilogram difference should be investigated rather than silently adjusted.
Spreadsheet or inventory software?
A spreadsheet can work when one person manages a small, stable list of materials and records every movement consistently. It becomes risky when several people update stock, products have linked BOMs, production consumes many materials, or managers need an audit trail.
Consider moving to inventory software when you need:
- Automatic raw-material deduction from production
- Low-stock alerts based on reorder levels
- BOM-based material requirement checks before a batch starts
- Purchase, production, sales and finished-goods records in one system
- Traceable adjustments and movement history
- Stock control that continues when internet access is unreliable
Drafto Inventory is designed for small Indian manufacturers that want raw-material tracking, BOM-based production, finished-goods stock and GST invoicing in an offline desktop system.
Raw-material inventory checklist
- Every material has one unique record and standard unit.
- Receipts are entered when deliveries arrive.
- Rejected and inspection-pending materials are separated.
- Every product has an accurate BOM or recipe.
- Material issues are linked to a production batch or job.
- Wastage, damage and returns use separate movement reasons.
- Reorder levels reflect use, lead time and safety stock.
- Critical items are cycle-counted regularly.
- Stock differences are investigated before adjustment.
- Slow-moving and obsolete materials are reviewed separately.
Frequently asked questions
What is the easiest way to track raw materials?
Start with one material list, standard units and four mandatory movements: receipt, issue to production, return and adjustment. Once that process is followed consistently, connect production consumption to each product’s BOM.
How often should raw materials be counted?
Count critical, expensive and fast-moving materials more often than stable, low-value items. The correct frequency depends on movement volume and the risk created by a stock difference. Cycle counting selected items throughout the year is usually more useful than waiting for one annual count.
What is the difference between minimum stock and safety stock?
Safety stock is the buffer kept for unexpected demand or supply variation. A minimum or reorder level is the stock position that triggers replenishment. A simple reorder level includes expected use during supplier lead time plus the chosen safety stock.
Can raw-material inventory be managed offline?
Yes. An offline inventory system stores operational data on the business’s computer and can record purchases, production and sales without a continuous internet connection. The business still needs a reliable backup routine and controlled access to the device.
Sources and further reading
- Association for Supply Chain Management: Inventory Management
- ASCM: Calculating safety stock amid variability
- Ministry of MSME: MSME Competitive (LEAN) Scheme Guidelines
Last updated: 27 September 2026. This guide provides general operational guidance. Adapt stock controls to your materials, production process and accounting requirements.