Reorder Point Calculator for Retail Stores

Know exactly when to reorder a product so you never run out of stock or tie up cash in excess inventory. Enter your sales velocity and supplier lead time to calculate your reorder point and safety stock. Built for independent retailers, gift shop owners, garden centers, and home decor store buyers.

What Is a Reorder Point and Why Does It Matter?

A reorder point is the exact inventory level that tells you it's time to place a new order with your supplier. When your stock of a product drops to this number, you order more. If you've calculated it correctly, the new shipment arrives just as your safety stock starts getting used — no stockout, no panic ordering, no overstocking.

Most independent retailers reorder by gut feeling — "the shelf looks low, better order more." This works until it doesn't. You forget to check one week, and your best-selling garden hook is out of stock for 10 days. Or you over-order because you think you're running low, and now you have six months of supply sitting in the back room while your cash is tied up.

Reorder point math eliminates the guesswork. It accounts for two things: how fast the product sells and how long it takes to get more. The formula adds a safety buffer on top so you're covered even when sales spike or your supplier ships late.

How Each Input Works

Average daily sales is your typical sell-through rate for this product. If you sell 21 units per week, that's 3 per day. You can pull this from your POS system's product sales report — look at the last 30–90 days for a reliable average. If you have strong seasonal swings (garden items in spring, holiday decor in Q4), use the average for the current season, not the whole year.

Maximum daily sales is your busiest realistic day — not a once-a-year blowout, but the kind of busy day that happens a few times a month. This drives your safety stock. If you set it too high, you'll carry too much buffer inventory. Too low, and you'll stock out during normal busy periods.

Average lead time is how many days it typically takes from when you place an order to when it's on your shelf and ready to sell. This includes the vendor's processing time, shipping transit, and your own receiving process. If your vendor ships in 2 days and ground freight takes 5 days, your lead time is 7 days.

Maximum lead time is the worst-case scenario — your vendor is backed up, the carrier is slow, it arrives on a day you can't process it immediately. This is the "everything goes wrong" number that your safety stock protects against.

Real-World Example

You sell a cast iron wall hook that averages 3 units per day. On busy weekends it can hit 5 per day. Your vendor typically ships in 7 days, but during their busy season it's taken up to 10 days.

Lead time demand = 3 × 7 = 21 units. That's how many you'll sell while waiting for the order. Safety stock = (5 × 10) − (3 × 7) = 50 − 21 = 29 units. That's your buffer for when things don't go as planned. Reorder point = 21 + 29 = 50 units. When your shelf count hits 50, place the order.

When to Recalculate

Your reorder point isn't set-and-forget. Recalculate when sales velocity changes (a product takes off or slows down), when you switch suppliers (different lead times), at the start of each selling season (spring garden vs. winter holiday), or if your vendor's shipping reliability changes. Most retailers review their top 20 SKUs monthly and the rest quarterly.

More Retailer Tools

Retail Markup Calculator — Enter your wholesale cost and desired margin or markup to instantly calculate your retail selling price and profit per unit.

SKU Generator — Create consistent, well-structured SKU numbers for your retail inventory. Build a naming system that scales with your store.

Open-to-Buy Calculator — Plan your inventory budget and know exactly how much you can spend on new wholesale orders each month or season.

Sales Per Square Foot Calculator — Measure your store's revenue efficiency and compare against industry benchmarks for gift shops, garden centers, and home decor stores.

Last updated: March 2026