Safety Stock Calculator: Safety Stock and Reorder Point
Free tool · Updated October 2, 2026 · By CouponTalk · Reviewed by CouponTalk Expert Reviews on
Your result
Enter your measurements to see your result.
Quick answer
Safety stock = (maximum daily sales × maximum lead time) − (average daily sales × average lead time). Selling 20 a day on average and up to 32, with lead times of 10 to 15 days, you need 280 units of safety stock. Reorder when stock falls to 480 units: 200 for normal lead time plus the 280 buffer.
How to use this calculator
- Take average and peak daily sales from the last 3 months.
- Note the usual and the longest time your supplier took to deliver.
- Set a stock alert at the reorder point.
Formula
Safety stock = (highest daily sales × longest lead time) − (average daily sales × average lead time)
Reorder point = average daily sales × average lead time + safety stock
Example: 32 × 15 − 20 × 10 = 280 units; reorder at 480
Recalculate every month and before every big sale event.
Frequently asked questions
Why do I need safety stock?
It covers sales spikes and supplier delays, so you don't lose ranking and sales by going out of stock.
Should safety stock change before Diwali?
Yes. Use expected festive daily sales, which can be 2 to 5 times normal in big sale events.
How is this different from the reorder point?
Safety stock is the buffer. The reorder point is the buffer plus normal sales during lead time.
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