One of the most useful numbers Amazon ever shipped is the quiet "X+ bought in past month" line that now sits under a huge share of listings. It's Amazon's own demand signal — no estimation model, no black box — and you can use it to size a market, validate a product idea, or keep an eye on a competitor.
The problem: it's buried on the page, it's not on every ASIN, and checking dozens of products by hand is painful. So we built a free Amazon monthly sales tracker that pulls it for any ASIN in seconds.
What "bought in past month" actually means
It's a rolling count of how many units of that listing Amazon recorded as purchased over the trailing ~30 days, shown as a rounded floor (100+, 1K+, 10K+). It's not a precise unit number and it isn't shown on every product, but where it exists it's the closest thing to ground-truth demand a seller can see without owning the Seller Central account.
How to check monthly sales for any ASIN
- ❶ Grab the ASIN from the product URL (the 10-character code starting with
B0, e.g.amazon.com/dp/B0B73XM8ZB). - ❷ Paste it into the free monthly sales tracker.
- ❸ Read the "bought in past month" figure it returns, straight from the live listing.
Why this beats guessing from BSR
Best Sellers Rank to sales conversions are guesswork — the curve is different in every category and changes constantly. The "bought in past month" number is Amazon telling you directly. When it's available, trust it over any BSR-to-sales calculator.
Turn a spot check into monitoring
A single reading is a snapshot. The real value is watching it move: a competitor's monthly sales spiking usually means they turned on ads or caught a trend, and a drop can signal a stockout or a rank slide. That's where an API earns its keep — you poll the number on a schedule and chart the trend instead of checking by hand. Pair it with our free keyword rank tracker to see whether a sales move lines up with a ranking move.
Frequently asked questions
Is the monthly sales number accurate? It's Amazon's own count, shown as a rounded floor. It's directional truth, not a to-the-unit figure — far more reliable than BSR-based estimates.
Why do some products not show it? Amazon only surfaces it above a certain volume and in certain categories. If a listing has no figure, it's usually low-volume or in an excluded category.
Do I need a Chrome extension? No. The tracker reads the live listing server-side, so it works on any device with just the ASIN.
Check a product now, free:
☞ Free Amazon Monthly Sales Tracker — or explore the full API at asgardata.com