Every product page shows you a Best Sellers Rank. Almost nobody knows what that rank means in units per month. Enter a BSR and category and find out how much your competitor actually sells.
BSR in · monthly sales range · revenue · demand verdict out
BSR curves are estimates built from observed sales data, and BSR moves daily with promos, seasonality, and stockouts. Use the range for planning and check the rank on a few different days before betting inventory on it.
Want this estimate in your inbox, plus the checklist we use to validate demand before a first order?
Here's how most first orders go wrong. A seller finds a product, sees a competitor with a nice-looking listing, and thinks "this must sell." So they wire five figures to a supplier based on a feeling.
Then the units land and reality shows up. The competitor's BSR of 80,000 meant about one sale a day, not thirty. The niche they thought was a gold mine barely moves. Now they own a garage full of proof that a rank without a translation is just a number.
BSR is public. The translation is the part nobody teaches you. That's what this estimator does, and it costs you nothing to check before the wire goes out.
Open any Amazon product page and scroll to product details. The main category rank is the number you want.
Each category has its own sales curve. We map your rank against the curve for that category and return units per month.
A sales range, a revenue estimate if you add price, and a plain-English demand verdict you can act on.
BSR to sales curves are estimates built from observed data, and BSR itself moves daily with promotions and seasonality. Treat the output as a range, not a promise. Check the product on three different days and use the middle of the range for planning.
A BSR of 5,000 in Home and Kitchen and a BSR of 5,000 in Office Products are different worlds. Bigger categories have far more total sales, so the same rank means far more units. That is why this tool asks for both numbers.
Yes. Run it as many times as you want, no account. Drop your email only if you want the estimate sent to you.
Always use the main category BSR, the big number near the bottom of the product page. Subcategory ranks only compare a product against a tiny slice of the catalog, so they inflate the estimate badly.
Three hundred sales a month means nothing if every unit loses two dollars after fees. Run the same product through our free FBA Profit Calculator and see the true profit per unit before you commit a dollar to inventory.
Check My Profit Per Unit → Takes about 60 seconds. Five inputs, full fee stack, real margin.