Free min-max inventory calculator
This free min-max inventory calculator sets the minimum and maximum stock levels for an item and tells you how much to order today. Enter average daily demand, supplier lead time, safety stock and your order quantity. It runs in your browser.
Min-max inventory calculator
Estimates for planning only. Results depend entirely on the numbers you enter. Nothing you enter is stored or sent.
The min-max formula
Max = Min + order quantity
Order = Max − (on hand + on order), when on hand + on order is at or below Min
A worked example
An item sells 20 units a day, with a 10-day lead time, 60 units of safety stock and an order quantity of 200. The minimum is 260 and the maximum is 460. With 190 on hand and 50 on order, your position of 240 is below the minimum, so you order 220. For more detail, read our guide to min-max inventory.
Frequently asked questions
What if I do not know my safety stock?
Work it out first with the safety stock calculator, then enter the result here.
What order quantity should I use?
An economic order quantity, a supplier minimum, or a set number of weeks of demand all work. Use whichever your supplier and cash allow.
Why include stock on order?
If you look only at the shelf, you will order again for stock that is already on its way.
Related
- Min-max inventory: formula and example
- Reorder point calculator
- Inventory planning software
- All free supply chain tools
Want min and max levels kept current for every item? The Optimization Lab recalculates reorder points and suggests orders from your own data.
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