Free Tool by VNDLY
Reorder Point Calculator
Find the exact stock level to reorder at — so you never run out and never over-order. Enter your usage and lead time and get your reorder point and safety stock instantly.
Your reorder point
960
units — reorder when stock drops to this level
Lead-time demand
350
avg usage × avg lead time
Safety stock
610
buffer for demand/lead spikes
Typical units sold or consumed per day.
Usual days from ordering to receiving stock.
Your busiest realistic day.
The longest a restock has realistically taken.
The formula
Reorder point = (avg daily usage × avg lead time) + safety stock
Safety stock = (max usage × max lead) − (avg usage × avg lead)
100% free · no signup · calculated in your browser.
Stop calculating reorder points by hand
This formula assumes steady demand. Real demand is seasonal and spiky. VNDLY tracks every product's actual sales velocity and supplier lead times, then uses AI demand forecasting to recommend exactly when and how much to reorder — automatically, for thousands of SKUs at once.
How the reorder point is calculated
The reorder point answers one question: at what stock level do I place my next order? It combines two things — how much you'll sell while waiting for the new stock to arrive (lead-time demand), plus a safety buffer for when things don't go to plan.
1. Lead-time demand
Average daily usage × average lead time. This is what you'll get through while you wait for the order to land.
2. Safety stock
(Max usage × max lead) − (avg usage × avg lead). The cushion that absorbs demand spikes and supplier delays.
From a formula to automatic reordering
Calculating one reorder point by hand is easy. Doing it for hundreds of products — and keeping it accurate as demand shifts and lead times change — is not. VNDLY tracks each product's real sales velocity and supplier lead times and uses AI demand forecasting to tell you exactly what to reorder and when, across every SKU and warehouse. Starting at $49/mo.
Frequently asked questions
What is a reorder point?
A reorder point (ROP) is the stock level at which you should place a new order, so fresh stock arrives just before you run out. Order too late and you stock out; order too early and you tie up cash in excess inventory. The reorder point is the sweet spot in between.
What's the reorder point formula?
Reorder point = (average daily usage × average lead time) + safety stock. Safety stock is the buffer you keep for when demand spikes or a delivery runs late, calculated as (max daily usage × max lead time) − (average daily usage × average lead time).
What is safety stock and why do I need it?
Safety stock is extra inventory held to protect against the unexpected — a sudden surge in orders or a supplier delay. Without it, any variability pushes you into a stockout. This calculator works it out for you from your maximum (worst-case) usage and lead time.
What units should I use?
Use whatever unit you sell or consume the product in (each, case, kg, etc.) and keep it consistent. 'Daily usage' is units per day; 'lead time' is in days. The result is the reorder point in the same units.
Does the formula handle seasonal or spiky demand?
Not on its own — the classic formula assumes fairly steady demand and a fixed average lead time. For seasonal products or volatile demand, you need software that forecasts from real sales history. VNDLY does this automatically across all your SKUs.