Why would you not stock up your shelves with as much inventory as you can so that customers have plenty of choice and therefore give you the maximum opportunity to make sales?
I can hear you shouting back things like:
- My inventory is fresh product so I can’t buy too much in advance
- My inventory is seasonal and I don’t want to be stuck with it
- My product is changing with technology so I can’t buy ahead too far
- I don’t have the money to buy the inventory
All of these are good reasons why you would not buy too much inventory but there is a more sound business reason and it is this.
You business should match its inventory to the level of sales that is achieved or likely to be achieved.
So how do you calculate this and work out the right level to aim for?
Here’s the calculation:
Match your inventory to the number of days that works for your business model. My suggestion is that it is no greater than 45 Days.
So the simple calculation is this:
Supplier Costs for Product for the last three months $100,000
Inventory level should be 45 / 90 * 100,000 = $50,000





