Reorder Point and Lead Time Calculator

About this calculator

The reorder point in inventory management is the stock level that triggers a new purchase order, timed so the new stock arrives before you run out. It's calculated as lead-time demand (daily demand × lead time in days) plus a safety stock buffer to absorb demand spikes or supplier delays: Reorder Point = (Daily Demand × Lead Time) + Safety Stock.

This is a core formula in supply chain and inventory management, used by retailers, manufacturers, and warehouse planners to avoid both stockouts (lost sales) and excess inventory (tied-up cash and storage costs) — the foundation of continuous review inventory systems and a staple of operations management coursework.