Min/Max Inventory Level Calculator
Set min and max stock levels for a simple, robust replenishment policy — order up to max when you hit min.
Min = reorder point (lead-time demand + safety stock). Max = min + a review cycle's demand. When stock hits min, order enough to bring it up to max. Simple, robust, and ideal for C-items and manual systems.
Sources & references
- Min/max (order-up-to / s,S) replenishment systems
- Periodic-review inventory policy
Inventory formulas use the model and inputs you provide — they are decision aids, not guarantees. EOQ, safety-stock and reorder math rest on assumptions (demand pattern, lead-time stability, cost accuracy) that rarely hold perfectly; treat results as a starting point and adjust to your data, service-level target and risk tolerance.
Min/Max is inventory control stripped to its most usable form: set a minimum (when stock hits it, reorder) and a maximum (the level you order back up to), and the policy runs itself. When on-hand falls to the min, you order enough to reach the max — order size flexes automatically with how much you've sold. This calculator sets both levels from demand, lead time, safety stock and your review cycle, giving you a complete, robust replenishment rule without the precision-fussiness of pure EOQ.
About Min/Max Inventory Level Calculator
The two levels each have clear logic. The MIN is just the reorder point — lead-time demand plus safety stock — the level at which you must order to avoid running out before replenishment arrives. The MAX is the min plus a review-cycle's worth of demand: it caps how much you hold (controlling carrying cost) while ensuring each order brings in enough to last until the next review. The gap between them is your typical order quantity, which adjusts naturally — a busy period draws stock further below the order-up-to level, so the next order is bigger, self-correcting for demand swings. Min/Max shines exactly where EOQ's precision isn't worth the effort: C-items (lots of SKUs, low value each), manual or semi-automated systems, and any situation where a simple, hard-to-get-wrong rule beats an optimal-but-fragile one. It's forgiving of rough inputs and easy for warehouse staff to execute (two numbers per SKU, no formula at the bin). Reserve detailed EOQ/safety-stock optimization for A-items where the dollars justify it, and run min/max for the long tail — a pragmatic split most real inventory operations land on. Pair it with the ABC analyzer to decide which SKUs get which treatment.
How to use Min/Max Inventory Level Calculator
- 1Set each input — average daily demand, lead time (days), safety stock, review / order cycle (days) — using your own figures.
- 2The estimate recomputes instantly as you type; no submit button, no waiting.
- 3Review the line-item breakdown to see how each component contributes to the total.
- 4Click “Copy quote” to paste the itemised result into an email, quote or audit note.
Why use Min/Max Inventory Level Calculator?
- ✓Itemised line-by-line breakdown, not just a single opaque total
- ✓Copy-ready output for emails, quotes and audit notes
- ✓Recomputes live as you type — compare scenarios in seconds
- ✓Free and private — nothing you enter leaves your browser
Frequently asked questions
How do min and max inventory levels work?+
The min is the reorder trigger (= lead-time demand + safety stock) — when on-hand stock falls to it, you reorder. The max is the order-up-to level (= min + one review cycle's demand) — you order enough to bring stock back up to it. So order quantity = max − current stock, which flexes with how much you've sold. It's a self-adjusting policy: two numbers per SKU, no calculation needed at reorder time, just 'order up to max when you hit min'.
How is min/max different from EOQ and reorder point?+
The reorder point IS the min. The difference is the order quantity: EOQ orders a fixed optimal quantity every time; min/max orders a variable quantity (up to max) that adjusts to current stock. EOQ minimizes total cost precisely but assumes steady demand; min/max is simpler, more forgiving of demand variability, and easier to execute manually — at the cost of not being cost-optimal. They're two replenishment philosophies: min/max for simplicity and robustness, EOQ for precision where it pays.
When should I use min/max instead of EOQ?+
For C-items (numerous, low-value, where optimization effort exceeds the savings), manual or low-tech inventory systems (min/max needs no formula at the bin), variable demand where EOQ's fixed quantity fits poorly, and any situation valuing a robust simple rule over a fragile optimal one. Most operations run a mix: detailed EOQ and safety-stock math for A-items where dollars justify it, and min/max for the long tail. The ABC analysis tells you which SKUs deserve which approach.
How do I set the max level?+
Max = min + the demand expected over one review/order cycle. The review cycle is how often you check and reorder (daily, weekly, etc.) — the max must hold enough to last from one order until the next arrives. A longer review cycle means a higher max (more stock between orders, fewer orders); a shorter cycle means a lower max (leaner, more frequent ordering). The calculator sets it from your review cycle and demand; adjust the cycle to trade order frequency against holding cost for the item.
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