Reorder smarter.
Stock with confidence.
Know exactly when to reorder, how many units to buy, and how much cash to set aside. A practical inventory planning calculator built for independent businesses.
Your inventory, clearer.
Enter details for one product. Results update as you type.
01 / Product & demand inputs
All fields editableCalculating…
Checking your current stock position.
02 / Your purchasing outlook
Decision supportCalculating suggested purchase.
See the formulas and assumptions
Reorder point = average daily demand × supplier lead time + safety stock. When inventory reaches or falls below this level, it's time to reorder.
Suggested order = units needed to reach (lead time + target coverage) days of demand, plus safety stock, minus current stock; rounded up to full order packs. This is a planning heuristic, not an economic order quantity optimization.
Days of coverage = current stock ÷ average daily sales. Order cost = suggested order × unit cost. The +25% scenario applies only to projected demand.
This assumes demand and lead time are stable, existing inventory is sellable, and there are no pending inbound orders. Sales variability, seasonality, minimum order value, and taxes are not modeled. Zero demand produces no reorder recommendation.
How to calculate when to reorder inventory
For a small retail business, the reorder point is the level of stock at which you should place a new purchase order. Enter your average daily sales, supplier lead time and desired safety stock to estimate that trigger. Add a target stock coverage period and cost per unit to model a suggested order quantity and purchasing budget. This free inventory reorder calculator helps you explore one product at a time; it does not access or update your store inventory automatically.
One product is easy.
Plan your entire inventory.
Inventory OS brings your product information, reorder planning and inventory purchasing decisions into one Excel + browser-based toolkit. One-time purchase, no subscription. Manual import; no automatic store or POS synchronization.
Made for better stock decisions.
Use this tool to run a quick what-if calculation for an individual SKU, whether you run a pet supply store, a specialty shop or a small retail business.
When current inventory reaches the reorder point: expected sales during supplier lead time, plus a safety buffer.
This calculator suggests a quantity based on your desired coverage and packaging increments. Adjust your inputs for supplier minimums and incoming stock.
No. Calculations run in your browser. The share button generates a URL containing your inputs; only share it if you're comfortable exposing those values.
No. It's a planning aid for a single SKU, not live inventory tracking or an accounting system.
Educational planning tool. Outputs are estimates, not accounting, financial, or professional inventory advice. Check supplier terms, shipment timing and demand variation before placing orders.