Reorder Point Calculator: Calculate reorder point in Seconds

Calculate when to reorder stock. Avoid stockouts and overstock. This tool helps you calculate, understand, and optimize this metric for your business.

By Veira Inventory Expert, Inventory Advisor at VeiraPublished June 2024Updated June 2024
Calculator
Cover for a late supplier or an unusually busy week.
Result
Reorder at 400 units
Average daily usage40 units
Supplier lead time7 days
Safety buffer3 days (120 units)
Reorder point400 units

When stock drops to 400 units, place the order. That covers the 7 days you wait for delivery plus a 3 day buffer for a late supplier or a busy week. Raise the buffer for items where a stockout loses the customer, not just the sale.

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The point of a reorder point

A reorder point turns "we are running low" into a number. When stock falls to it, you order, and the arithmetic is simple: how much you sell in a day, multiplied by how many days you wait for the supplier, plus a buffer.

Most stockouts in small Kenyan retail are not caused by bad forecasting. They are caused by nobody having agreed the trigger in advance, so the order goes in when someone notices an empty shelf.

Setting the buffer honestly

The buffer covers the supplier being late and the week being busier than usual. Set it higher for items where a stockout sends the customer to a competitor rather than just delaying the sale, and for suppliers whose lead time you know varies.

Set it lower for perishables and for anything where holding stock costs you more than missing a sale.

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Worked examples

Selling 40 units a day, supplier takes 7 days
  • Lead time cover: 280 units
  • Three-day buffer: 120 units
  • Reorder at 400 units

Frequently asked questions

How do I calculate a reorder point?
Average units sold per day, multiplied by the supplier lead time in days, plus a safety buffer expressed in days of cover.
How big should the safety buffer be?
Larger where a stockout sends the customer to a competitor rather than just delaying the sale, and where the supplier lead time varies. Smaller for perishables and anything where holding stock costs more than missing a sale.
Should the reorder point change through the year?
Yes where demand is seasonal. The daily usage figure is the input that moves, so recalculate ahead of a known peak rather than during it.
What if my supplier lead time is unpredictable?
Use the longer end of the range rather than the average, and put the difference into the safety buffer. An average lead time with an unreliable supplier produces stockouts roughly half the time.

Doing this by hand every time? Veira runs the same calculation automatically on every sale, no spreadsheet required.

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