Short answer
To track fragrance raw material inventory in a small lab, record a quantity and unit on every material record (in grams, not bottles), keep dilutions as their own stock items linked to the parent material, update counts when you receive, use or finish a material, and set a reorder point for materials you rely on. Multiply stock by price per gram for stock value, and keep "quantity not recorded" visibly different from "out of stock". Count physically every few months to correct drift.
Count in grams
Inventory in "bottles" or "about half full" cannot be planned with. Record every material in a weight unit — grams, or kilograms for large stock — because that is the unit formulas use. The fastest accurate way to know what is in a bottle is to weigh it: record each container's empty (tare) weight on its label when you first fill or receive it, and the net weight is the reading minus the tare. Volume markings on bottles are approximate and depend on density (see weighing vs measuring by volume).
What to record per material
- Quantity and unit.
- Location: shelf, fridge, cabinet.
- Date received and lot; date opened.
- Price per gram, and the date of that price.
- Reorder point: the quantity at which you buy more.
- Supplier and typical lead time.
These fields sit naturally on the material record itself; the raw material documentation guide describes the full record.
Dilutions are stock too
A lab often holds a material neat and as one or two dilutions. Each dilution is a separate physical stock — "Ambroxan 10% in DPG, 45 g" — that must be counted on its own. Link it to the parent so you can see both together: 8 g of neat Ambroxan plus 45 g of the 10% solution means 12.5 g of Ambroxan in total. When planning a batch, check that you have enough of the dilution the formula calls for, not just enough of the material. How to dilute aroma chemicals covers making and labeling them.
Keeping counts honest
Inventory drifts. Material is used in trials without being recorded, evaporates from loosely capped bottles, sticks to pipettes. Three habits keep the figures close to reality:
- Record at the moment of change. When a delivery arrives, when a batch is made, when a bottle is finished.
- Deduct for batches, not trials. Small trials are hard to deduct one by one; production batches are not. Deduct batch quantities exactly and catch trial usage in periodic counts.
- Count physically on a schedule. Weigh everything every few months, or count a few materials each week in rotation, and correct the records.
Reorder points
A reorder point is the quantity at which you order more, chosen so that you will not run out before the new stock arrives:
reorder point = typical use per week × lead time in weeks + safety margin
If you use about 20 g of a material a week and it takes three weeks to arrive, a reorder point around 60 g plus a margin — say 80 g — is reasonable. For materials that go into a product you sell, be generous; running out of a key natural mid-production is expensive. For materials that degrade quickly, don't overbuy: stock that oxidizes before use is not an asset (see fragrance raw material shelf life).
Stock value
stock value = Σ (quantity in grams × price per gram)
Stock value tells you what your shelves are worth and where money is tied up. It is also where blanks bite: a material with stock but no price is not worth $0, and a total that counts it as zero understates the value. Report materials with no price separately, and fix them. The same price data drives formula costing — see how to calculate the cost of a perfume formula.
Out of stock vs not recorded
"0 g" means you counted and there is none. An empty quantity means nobody has recorded one. The two need different actions — reorder, or go and count — and a records system should never display them the same way. The same applies to "idle" stock: materials with stock that no formula uses are worth reviewing, either to use or to stop buying.
Lots and traceability
When you receive a new lot, record it, and if a lot of a natural material is noticeably different, note it. Stock is not interchangeable across lots for a product you sell; you need to know which lot went into which batch. How to document raw material supplier and lot changes covers this.
Spreadsheet or software
Inventory is one of the first things to outgrow a spreadsheet, because it changes constantly and must stay linked to formulas and costs. In RUŌOD Lab, each material records an inventory figure and unit alongside its cost, and the cost and inventory report shows stock value, unit costs, and materials that are out of stock separately from those with no stock recorded; the material usage report crosses unused materials with the value of the stock they hold.
Frequently asked questions
How often should a small lab count stock?
A full physical count every three to six months, plus counts whenever you are about to rely on a material for a production batch, is a workable rhythm for most small labs.
Should samples from suppliers be in the inventory?
Yes, if you might use them. Mark them as samples so you do not plan production around a 5 g vial.
Written and reviewed by the RUŌOD Lab team. This article is general education about perfume formulation and record-keeping; it is not legal, regulatory or safety advice, and the examples are illustrations, not validated commercial formulas. How we write and check these guides.