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Stockouts are expensive in ways sellers rarely count: the lost sale is only the beginning — the listing loses rank, ad spend burns on an empty page, and regular buyers drift to competitors. Over-ordering is equally costly in tied-up cash. The fix is a single number: your reorder point, the on-hand stock level that triggers the next purchase order. It is simple arithmetic — average daily sales multiplied by your supplier's true lead time plus a safety buffer — but most small sellers run on vibes until the first stockout hurts. This calculator turns your real sales rate, lead time and chosen buffer into the exact trigger number, with an honest read on whether your buffer is generous or reckless.
Running out of stock kills momentum and rankings; over-ordering ties up cash. Enter your daily sales rate, supplier lead time and the safety buffer you want — the calculator returns the exact stock level at which you should place the next order.
Divide the units you sold over the last 30-90 days by the days in that period — using the longer window smooths out one lucky week. If a product is new, start with a conservative estimate and recompute monthly as real data arrives.
The full days from clicking order to the stock being sellable: supplier processing, transit and your own put-away time. The delivery quote on the website is rarely the real number — time one actual order to learn yours.
Enough to cover your worst realistic month, not your average — for most small sellers that is 7-14 days of sales. More buffer is safer but costs cash; trim it once your supplier proves reliable.
Every tool answers instantly from our own knowledge and calculators — no AI wait, no account. Want the deeper, personalised version? Each has a $2.95 full report.