How to Validate Product Demand Before You Commit

Demand validation answers one question. Are enough people already buying this, consistently, to make it worth your money? It's the step that saves you from a beautiful product nobody wants. The usual trap is mistaking interest for demand. Likes, saves, and a good feeling all look like demand, and none of them pay you. Only sales do.

Amazon doesn't publish sales figures, but it shows enough to estimate them closely.

Read BSR as a sales proxy

Best Sellers Rank is Amazon's closest public signal for how fast a product sells inside its category, where number 1 is the top seller. A low BSR means high sales speed right now. Because the rank is specific to a category, a BSR of 5,000 in a giant category means far more sales than the same rank in a small one. So always turn a BSR into an estimated unit range for that exact category, rather than comparing raw ranks across different ones.

Cross-check against harder signals

• Where Amazon shows a "bought in past month" figure, treat it as a measured floor. It's much stronger evidence than any estimate.
• Watch review velocity, meaning how quickly reviews pile up. It gives you a second, independent read on how fast a product sells.
• Look at the trend over weeks, not one day. A single day's spike can move a BSR by thousands of places, and consistency is what you're actually paying for.

Dropshipping has no BSR, but the signals are arguably more public. You just have to read a few of them at once.

• Order counts on AliExpress and Temu are a direct units-sold signal on the supplier side. High and rising counts point to real, current demand.
• Ad engagement is your read on the customer side. Products with videos pulling in views, comments, and shares are turning attention into buying intent.
• Search interest shows direction. You want a trend that's climbing, and you want to be early, before the product is in every store.

Read them together. Rising order counts, fresh ad engagement, and climbing search interest are three independent signals pointing the same way, and that's worth trusting. A single viral video on its own can just be noise.

There's no universal number, because the answer depends on your margin and your goals. A high-ticket product needs far fewer sales a day to be worth it than a low-margin impulse buy. Work backwards from the money. Estimate the units, multiply by the profit you'd realistically keep per sale, and see whether the result clears your bar. Demand only counts relative to what each sale pays you, which is why you check demand and margin together.