Reorder Point Calculator

The reorder point is the inventory level at which you need to place a new order with your supplier to avoid running out of stock. It accounts for two things: the demand you will experience during the lead time (the time between placing and receiving the order) and a safety stock buffer for unexpected demand spikes or supplier delays.

The formula is straightforward: daily sales multiplied by lead time in days, plus safety stock. If you sell 25 units per day and your supplier takes 45 days to deliver, you need at least 1,125 units in stock when you place the order just to cover lead time demand. Adding 14 days of safety stock (350 units) brings the reorder point to 1,475 units.

This calculator also shows how many days you have until you hit the reorder point based on your current stock, giving you a concrete deadline for placing your next order. If that number is negative, you should have already ordered — every day of delay increases your stockout risk.

Stockouts are expensive for ecommerce brands in ways that go beyond lost sales. They cause advertising waste (you pay for clicks that cannot convert), damage your organic search rankings (Google deprioritizes out-of-stock products), hurt your Amazon BSR, and disappoint customers who may not come back. Setting accurate reorder points and reviewing them monthly as your sales velocity changes is one of the simplest ways to protect revenue and prevent the cascade of problems that stockouts create.