Days of stock and reorder point calculator
See how many days an item's stock will last, and when to order from your supplier before the shelf runs empty.
Stock days
Formula: Days of stock = stock ÷ daily sales · Reorder point = daily sales × (lead time + safety days)
How to use it
What's on the shelf and in the back together, in the unit you sell.
The item's sales over the last 30 days divided by 30, or by the days you were open.
How many days the supplier takes to deliver, and how many extra days you want as a buffer.
Days of stock is how long what you have on hand will last if sales keep the same pace. You have 120 boxes of an item and sell 8 a day, so you have 15 days of stock. That number alone isn't enough, though. Your supplier needs time to deliver, and if you order on the last day, the shelf sits empty for days while customers buy somewhere else.
That's what the reorder point is for: the stock level at which you place the order. If the supplier takes 4 days and you want 2 days of buffer for delays, your reorder point is 8 × (4 + 2) = 48 boxes. You should order when stock drops to 48, which happens 9 days from now, because (120 - 48) ÷ 8 = 9. And if each box costs you 1.250 JOD, the stock you hold of this item is worth 150.000 JOD.
Ghalleh works out days of stock for every product from its real sales, suggests what to reorder, and alerts you when something is about to run out.
Common questions
How do I work out average daily sales?
Add up what you sold of the item in the last 30 days and divide by the days the shop was open. 208 boxes over 26 working days is 8 a day.
How many safety days should I add?
It depends on the supplier. A reliable one needs a day or two. For a supplier who is sometimes late, or an item that sells fast, add more. Every extra safety day means more stock on the shelf and less cash in hand.
What about seasonal items, like Ramadan stock?
Don't rely on last month's average before the season. Use the same season's sales from last year, because the pace changes a lot during Ramadan, Eid and back-to-school.
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