Sales Rank Overview

Sales rank is the first number most new sellers learn and the one most often misread. This lesson explains what it measures, why a single reading can mislead you, and where to find it.

What the number means

Amazon gives every product a Best Sellers Rank within its category. It reflects how that product has sold recently, relative to everything else in the same category.

Lower is better. A rank of 5,000 means the product sells more often than one ranked 200,000 in the same category. Rank 1 is the best seller in that category.

Two things follow from that definition, and both trip people up.

It is relative to a category, so ranks are not comparable across categories

A rank of 100,000 in a very large category can represent several sales a day. The same rank in a small category can represent a few sales a year. The number on its own tells you nothing until you know which category it sits in and roughly how large that category is.

This is why the course provides sales rank guidelines per category rather than one universal threshold, and why any rule of the form "only buy under 100,000" is unreliable in isolation.

It is a snapshot, and that is the real trap

Amazon recalculates rank many times a day, and it responds sharply to recent activity. A product that has sat unsold for months at a rank of a million can be pushed to a far better rank by a single buyer purchasing ten units.

If you scan that product an hour later, you see an excellent rank. You conclude it sells well. You buy twenty units. In reality the product sells a handful of times a year, and one order distorted the picture at the moment you happened to look.

The rank was not wrong. You asked the wrong question. Rank answers "how has this sold very recently", not "how does this sell".

What to use instead

The reliable version of the question is the history. You want to know:

• The average rank over months, not the rank right now.
• How often the rank drops, because each significant drop indicates a sale. A rank that moves constantly belongs to a product that sells constantly. A flat line with occasional cliffs belongs to one that does not.
• Whether the pattern is seasonal. Plenty of products sell well for two months a year and barely at all for the other ten.

That history is what the Advanced Keepa Sourcing module is about. For now, the rule to carry forward is simple: never buy on a single rank reading.

Where to find sales rank

• The product page on Amazon. Scroll down to the product information section. The Best Sellers Rank is listed there, usually with a main category rank and one or more subcategory ranks. Use the main category figure, because subcategory ranks look far better and mean much less.
• The Amazon Shopping app. The same information, on a phone.
• The Amazon Seller app. Free once you have a seller account, and the more useful of the two, because it shows fees and your own eligibility alongside the rank. There is a whole lesson on it in the Retail Arbitrage module.
• Paid scanning apps such as SellerAmp SAS, covered later in this course.

One caution about missing ranks

Some products show no sales rank at all. That is not a good sign or a bad one on its own, but it does mean you have no demand signal from this source, so the decision has to rest on other evidence.

What to take from this lesson

Sales rank tells you how recently and how often something has sold, within one category, at one moment. It is a genuinely useful signal and a poor decision on its own. Learn where to read it now, and the modules on Keepa will teach you to read the history behind it, which is what you will actually buy on.