Reorder Point Calculator (Free Google Sheet Tool)
Knowing exactly when to reorder stock is one of the most important parts of running an e-commerce or Shopify business. Order too early and you tie up cash unnecessarily. Order too late and you risk stockouts, disappointed customers, and lost sales. That’s where a clear Reorder Point (ROP) comes in — a simple calculation that tells you the precise inventory level at which you should place your next purchase order.
To make this easy, we’ve built a free Reorder Point Calculator in Google Sheets. It’s fast, simple, and gives you an accurate reorder point in seconds. This page includes the tool, an explanation of the formula, examples, and a look at how Verve AI can automate this process for your entire catalogue.
What Is a Reorder Point?
A Reorder Point is the stock level at which you should trigger your next order. It ensures you never run out of inventory before your new shipment arrives.
The standard formula is:
Reorder Point = (Average Daily Demand × Lead Time) + Safety Stock
Each part of the formula plays a critical role:
Average daily demand tells you how fast you're selling the product.
Lead time accounts for how long it takes suppliers to deliver stock.
Safety stock protects you from demand spikes or supplier delays.
When your stock falls to this level, it’s time to reorder.
How the Reorder Point Calculator Works
Our Google Sheets tool walks you through the calculation with four simple inputs:
Average daily demand (units)
Lead time (days)
Safety stock (units)
(If you don’t know this, the sheet includes a Safety Stock Helper tab.)Current inventory
With this data entered, the calculator displays:
Your Reorder Point (units)
Days until you should reorder
A traffic-light status warning (Healthy, Approaching, Reorder Now)
Multi-SKU support for more advanced users
This makes it ideal for Shopify merchants, D2C brands, wholesalers, and inventory managers who need fast clarity.
Get Your Free Reorder Point Calculator
Sign up below and receive the link instantly.
Reorder Point Formula (With Example)
Let’s walk through an example using the calculator.
Suppose you have:
Average daily demand: 20 units/day
Lead time: 10 days
Safety stock: 50 units
Current stock: 350 units
Step 1 — Reorder Point
(20 × 10) + 50 = 250 units
Step 2 — Days Until Reorder
(350 – 250) ÷ 20 = 5 days
Interpretation:
You have five days until you reach your reorder point. After five days of sales, you should place a replenishment order to avoid running out of stock during your supplier’s lead time.
Why Lead Time & Safety Stock Matter
Lead Time:
Lead time determines how long you must rely on current inventory before new stock arrives. Longer or inconsistent lead times increase your reorder point because they increase risk.
Safety Stock:
Safety stock exists to protect you from volatility. If demand spikes or a supplier delays your shipment, safety stock prevents stockouts.
Review Frequency:
You should review your reorder points monthly, or more often if demand patterns change, you switch suppliers, or you’re entering seasonal peaks.
Download the Reorder Point Calculator (Google Sheets)
You can download your own copy of the tool here:
The tool includes:
Single-SKU calculator
Multi-SKU reorder table
Safety stock helper
Methodology & formula explanations
A Verve AI CTA panel for deeper forecasting tools
Why Verve AI Is Better Than Spreadsheets
The calculator is a great starting point — but maintaining ROPs manually becomes difficult as soon as you add:
Multiple SKUs
Variable lead times
Seasonality
Supplier changes
Promotions or spikes in demand
Multi-warehouse setups
Frequent stock updates
Most merchants quickly outgrow spreadsheet-based ROPs.
Where Verve AI Helps
Verve AI automatically:
Pulls real sales and inventory data directly from Shopify
Recalculates reorder points continuously
Uses live supplier lead times
Forecasts demand using machine learning
Flags products that are at risk of stockout or overstock
Generates purchase orders in a few clicks
Keeps everything synced, without manual updates
Instead of manually updating average daily demand or lead times, Verve AI does the work for you — and updates in real time.
The result:
A smarter, fully-automated version of your reorder point system that scales with your catalogue and removes guesswork.
Automate Reorder Points With Verve AI
If you find this calculator helpful, Verve AI gives you the end-to-end system behind it. You get forecasting, reorder planning, PO creation, supplier tracking, and inventory alerts — all inside your Shopify admin.