You sell the last unit of your best seller on a Friday afternoon. You don’t notice. The orders keep coming in over the weekend, except now you can’t fill them. By Monday you’ve got three “where’s my order?” emails, a refund to process, and a customer who’s already found the same thing somewhere else.

Running out of stock isn’t just a logistics hiccup. It’s lost revenue, a dented reputation, and a chunk of your week spent apologising. The frustrating part is that it’s almost always avoidable. You don’t need a warehouse manager or expensive software. You need a system that watches your numbers and taps you on the shoulder before the shelf is empty.

Here’s how to set that up, what it costs, and why it pays for itself the first time it saves a sale.

What does “low stock alerts on autopilot” actually mean?

A low stock alert is a message that fires automatically when one of your products drops below a number you’ve chosen. “On autopilot” just means you’re not the one checking. A tool watches your stock for you, around the clock, and only speaks up when something needs reordering.

You decide the rules once. For each product you set a reorder point, the level at which you want a heads up. Maybe that’s 10 units for a fast mover and 3 for something you sell once a month. From then on, the system compares your current stock against those numbers and emails or texts you the second anything dips below the line.

That’s the whole idea. No daily stocktake, no mental note you’ll forget by lunch. Just a quiet alert that lands before you run dry, often with the supplier email half written for you.

Why do stockouts cost so much more than the missed sale?

It’s tempting to think a stockout just costs you one sale. It costs far more than that. Retailers lose an estimated 1.2 trillion US dollars a year to out of stock situations, and the damage rarely stops at the missing item.

When a customer can’t buy what they came for, around 43% simply go to a competitor. Some of them don’t come back. That’s why analysts often put the true cost of a stockout at two to five times the value of the lost sale, once you factor in the customer you may never see again and the bad review they leave on the way out.

For a small NZ business, the maths is brutal in a different way. You don’t have the foot traffic of a big chain to absorb the loss. Every customer is hard won, and losing one to an empty shelf you could have restocked is the kind of own goal that’s worth a few minutes to prevent.

How do you set up automatic low stock alerts step by step?

You can build this in an afternoon with a no-code tool. Make.com is the one we reach for most because it’s cheap and it connects to almost everything. If you’re new to it, our beginner’s guide to Make.com walks through the basics first. Here’s the build.

1. List your products and set a reorder point for each. Be honest about how fast each one sells and how long your supplier takes to restock. A 7 day lead time means your alert needs to fire while you’ve still got a week’s worth on the shelf.
2. Put your stock numbers somewhere the automation can read them. A Google Sheet works fine. So does Shopify, WooCommerce, Airtable, or whatever you already use. The tool just needs one source of truth for “how many do I have?”
3. Connect that source to Make.com. Add a module that reads your stock list. Make has ready built connections for Sheets, Shopify and the rest, so this is usually a couple of clicks and a login.
4. Add a filter so it only acts when stock is low. Set the condition to continue only when current stock is less than or equal to the reorder point. This is the bit that stops your inbox filling with alerts for things you’ve got plenty of.
5. Add the alert action. Email yourself, send a text, or post to a Slack channel. Better still, have it draft the supplier reorder email with the product name and quantity already filled in, so you just hit send.
6. Schedule it and test. Run it every morning, or hourly if you sell fast. Then deliberately set one product below its reorder point and check the alert lands. Once it works, leave it running.

That’s it. Set up once, working for you every day after.

What if you don’t have fancy inventory software?

You don’t need any. Plenty of NZ businesses run their whole stock list in a spreadsheet, and that’s a perfectly good foundation for this.

Add two columns to your sheet: current stock and reorder point. Make.com reads the sheet on a schedule, compares the two, and alerts you on any row where stock has fallen to or below the reorder point. If you’d rather not automate at all yet, even a simple conditional formatting rule that turns a row red when stock is low is better than nothing. The automation just means you don’t have to open the sheet to see it.

If you sell online, the same approach scales up nicely. We’ve covered how to automate an Etsy shop with Make.com, including stock and dispatch, and the low stock alert slots straight into that kind of setup.

Is this actually worth it for a small business?

Short answer: yes, and it’s one of the easiest wins going. Here’s the honest view.

Most small businesses don’t run out of stock because they’re careless. They run out because they’re busy. You’re serving customers, packing orders, doing the books, and “check the stock levels” lives on a mental list that never gets to the top until something’s already gone. Automation doesn’t make you more disciplined. It just removes the need to be.

The cost is close to nothing. Make.com has a free tier that covers a basic alert, and paid plans start at a few NZ dollars a month. Weigh that against a single lost sale, let alone a lost customer, and it pays for itself almost immediately. The same logic applies to the rest of your admin. Once stock alerts are humming, sending an automatic email on every order is the natural next step.

The only real downside is that your stock numbers have to be accurate for the alert to be accurate. Garbage in, garbage out. But if you’re already tracking stock anywhere, you’re most of the way there.

Frequently asked questions

What is a reorder point? It’s the stock level at which you want to be told to reorder, set high enough to cover the time it takes your supplier to restock. If a product sells 5 a week and your supplier takes two weeks, your reorder point should be at least 10 so you don’t run dry while you wait.

Do I need to know how to code? No. Tools like Make.com are built for non technical users. You drag modules around and fill in boxes. If you can set up a spreadsheet, you can build a low stock alert.

How much does it cost in NZ? You can start free. Make.com’s free plan handles a simple daily check, and paid plans begin at roughly 15 to 20 NZD a month for higher volumes. Compared to the cost of a stockout, it’s a rounding error.

Can it alert my supplier directly, not just me? Yes. You can have the automation draft or even send the reorder email straight to your supplier with the product and quantity filled in. Most owners prefer a draft they approve, at least at first, so nothing goes out by mistake.

What if my stock counts aren’t always accurate? Then fix that first, because the alert is only as good as your numbers. The good news is that connecting your sales channel, like Shopify, to your stock list means the count updates itself as you sell, which keeps it honest.

Will it work if I sell in a physical shop, not online? Yes, as long as you record stock somewhere digital. A point of sale system or even a maintained spreadsheet gives the automation something to read. The alert doesn’t care whether the sale happened on a website or over the counter.

Stop running out. Put it on autopilot.

You’ve got better things to do than count stock and chase suppliers. A low stock alert is a small automation that quietly protects your revenue every single day, and it’s one of dozens we can set up for you.

Want it built and running without the fiddling? See how Overcomers AI sets up automations for NZ businesses.