Reorder Point Calculator: When to Restock Your Inventory
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
Reorder point = average daily sales × supplier lead time + safety stock. If you sell 20 units a day, your supplier takes 10 days and you keep 5 days of safety stock, reorder when stock falls to 300 units. Order enough to cover your chosen cover period, for example 30 days (600 units).
How to use this calculator
- Use the last 30 days of sales to get average daily sales.
- Enter how many days your supplier takes from order to delivery (including inbound to FBA if used).
- Choose safety stock days for festival spikes or delays.
Formula
Safety stock = Daily sales × Safety days
Reorder point = Daily sales × Lead time + Safety stock
Order quantity = Daily sales × Cover days
Fees and rates checked on 2 October 2026. Marketplaces revise rate cards often, so confirm current figures in your seller dashboard before you set prices.
Frequently asked questions
How much safety stock should I keep?
Most small sellers keep 3–7 days of sales as safety stock, and more before festive sales such as Diwali or Big Billion Days.
Does a stock-out hurt my ranking?
Yes. Going out of stock on Amazon or Flipkart can lose you the Buy Box and search rank, which can take weeks to recover.
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