Reorder too early and you tie up cash you do not have. Reorder too late and you lose rank to a stockout. Enter five numbers and get the reorder point, the order quantity, and the date to pull the trigger.
reorder point · order quantity · days of cover · reorder-by date
The order quantity covers one full lead-time cycle plus your safety buffer. Adjust safety days up for volatile demand or unreliable suppliers.
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Most sellers reorder on a feeling. Stock looks low, so they order. Or a supplier deadline looms, so they order early and park a wall of cash in a warehouse.
Both mistakes cost money. Order late and you go dark for two weeks while your rank bleeds to the competitor above you. Winning that rank back after a stockout costs more in ad spend than the inventory ever would have. Order early and you are financing Amazon's storage while your cash sits frozen in boxes.
There is a right number and a right date. This calculator gives you both from the inputs you already track.
Daily velocity, lead time, current stock, safety days, and your growth trend. All of it lives in your inventory dashboard.
Velocity gets lifted by your growth rate, then we compute the reorder point, order quantity, and cover left.
Exact units to order and the day your stock hits the reorder point, so you place the order right on time.
Your adjusted daily velocity times lead time plus safety days. When on-hand stock drops to that number, you place the order. It gives you enough cover to survive the full lead time plus a safety buffer without going dark.
Extra days of inventory to absorb a demand spike or a late shipment. Most sellers use 14 to 30 days. Fast movers with unreliable suppliers need more, slow sellers with steady suppliers need less.
Your reorder covers future sales, not past sales. If velocity is trending up, ordering off last month's numbers guarantees a stockout mid-cycle. The growth rate lifts velocity so the order matches the demand you will actually see.
Yes. Run it as many times as you want, no account. Drop your email only if you want the breakdown sent to you.
The right order quantity protects your rank. The wrong storage timing quietly eats the margin, especially heading into the fourth quarter when rates climb. Check what a full order costs to sit in a fulfillment center before you commit the cash.
See My Storage Cost → Takes about a minute. Especially worth it before October.