Inventory is maintained in Sorts. When a load arrives at the scale, the scaler allocates a percentage of the load to each inventory sort. For example:
- A load arrives that is entirely Hemlock; The scaler allocates 100% of the load to the Hemlock sort.
- A mixed load arrives; The scaler allocates 50% to Hemlock, 30% to Spruce and 20% to Pine.
To compute the volume of the load for inventory purposes, each sort has both an Arrival and Departure conversion factor. This is because the conversion factor typically increases over time as logs are stored on land. When a load arrives, the sum of its weight multiplied by the conversion factor and sort % is the amount of that sort volume added to inventory. For the second example above, assume the sorts have the following arrival conversion factors:
| Sort | Conversion |
| Hemlock | 1.1000 |
| Spruce | 1.2000 |
| Pine | 1.3000 |
If the net weight of the load was 30,000kg, then the following additions would be made to inventory:
| Sort | Conversion | Net Weight | Load % | Volume |
| Hemlock | 1.1000 | 30000 | 50% | 16.500 |
| Spruce | 1.2000 | 30000 | 30% | 10.800 |
| Pine | 1.3000 | 30000 | 20% | 7.800 |
| 100% | 35.100 |
Each load is also stratified based on the scale's population stratification plans. Both company and government samples may be taken at different intervals. Company samples may be targeted or random while government samples are always random. In order to check the conversion factors used to apply sort volumes to inventory,