Everything for Amazon Sellers—in One Base.

BSR (Best Sellers Rank) is Amazon’s relative popularity number that shows how a product sells compared to others in the same category — lower is better, #1 is the top seller. It is driven almost entirely by sales volume, weighted toward recent sales, and it updates frequently throughout the day. It is not a quality score, and it cannot be edited directly. This guide explains what BSR is, how Amazon says it is calculated, why the number behaves the way it does, and the honest answer to the question every seller eventually asks: can you actually “optimize” your BSR? ...

Amazon Buy Box: What It Is (Now the Featured Offer) and How to Win It The Amazon Buy Box is the block at the top-right of a product detail page with the Add to Cart and Buy Now buttons. Amazon has renamed it the Featured Offer: when several sellers list the same product, Amazon picks the most competitive offer to feature there, and the customer buys from that seller by default. Winning the Featured Offer matters because the large majority of Amazon sales go through those two buttons rather than the “Other Sellers on Amazon” list beneath them. You win it by being competitive on price, fulfillment speed, stock, and seller performance—not by paying for it. ...

Amazon FBA Fee Increase 2026 & New Selection Program Upgrade The 2026 Amazon FBA fee increase is small in headline terms — fulfillment fees rose an average of $0.08 per unit (less than 0.5% of a typical item’s price) effective January 15, 2026, and Amazon has confirmed there are no new FBA fee types in 2026. The parts that actually move your Q3–Q4 numbers are two dated events still ahead of you: the FBA New Selection Program (2026) upgrade goes live July 30, 2026 with larger fee credits for new products, and the holiday peak fulfillment surcharge returns October 15, 2026 at an average of $0.32 per unit plus a 3.5% fuel and logistics surcharge. This guide lays out each change, who it hits, and the three things worth doing before the end of July. ...

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Amazon Sales Estimator Tools: How Accurate Are They Really? Every Amazon sales estimator — free or paid — works the same way: it reverse-engineers a product’s Best Sellers Rank (BSR) into a monthly-sales guess. None of them sees Amazon’s real sales data, so none is accurate enough to bet a product launch on by itself. The practical answer is to run two or three estimators, treat the numbers as a range rather than a fact, and cross-check the range against first-party signals before you commit money. This guide compares the main free estimators — Jungle Scout, Helium 10, AMZScout, and SellerAmp — on the one dimension that decides whether a launch works: estimate accuracy, with all access limits checked on 2026-07-20. ...

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Best Amazon Repricer 2026: Aura vs Informed vs Seller Snap vs BQool Compared The best Amazon repricer for most sellers is Amazon’s own Automate Pricing if you want a free, safe starting point, BQool if you want the cheapest paid AI repricer (from $25/mo), and Seller Snap if you run a large catalog and can absorb $100–$500/mo for game-theory AI repricing. There is no single “best” tool—the right pick depends on your monthly revenue, catalog size, and how much billing risk you can tolerate. This guide compares six repricers on 2026 pricing, real user complaints, and the two things that actually decide the outcome: Buy Box win rate and total cost of ownership. ...

FBA vs FBM: How to Choose Between Amazon and Self-Fulfillment FBA vs FBM is the choice between letting Amazon store, pack, and ship your orders (Fulfillment by Amazon) or handling storage and shipping yourself (Fulfillment by Merchant). FBA buys you Prime eligibility and hands off the logistics for a per-unit fee; FBM keeps fulfillment — and its margin, control, and workload — in your own hands. Neither is universally “better.” The right answer depends on the product, your margins, and how much of the operation you want to run yourself — and many sellers use both at once. ...

Amazon Agency: A Buyer’s Red-Line Checklist for Vetting a Full-Service or VAT Partner The best Amazon agency is not the one at the top of a “top 10” list — it is the one whose contract, reporting, and accountability survive the checklist below. Almost every ranked list of “best Amazon agencies” is published by an agency, so the useful question is not which agency is best but which red lines disqualify one before you sign. This guide is a neutral, buyer-side vetting framework built from real, dated seller complaints, plus the questions to ask before money changes hands. ...

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Free FBA Fee Calculator: Which One to Trust and What Each Actually Covers The most reliable free FBA fee calculator is Amazon’s own FBA Revenue Calculator inside Seller Central — it uses Amazon’s live fee schedule, so it is the number every other tool is measured against. The popular third-party free calculators (Helium 10, Jungle Scout, AMZScout, SellerApp) are convenient because you can reach them without a seller login, but they differ in one thing that actually matters: how many of your real costs they model. Some stop at the referral fee and fulfillment fee. Others add monthly storage, returns processing, and PPC. This guide names what each free calculator covers, gives the free red line for each, and quotes real users on where the numbers drift. ...

TACoS vs ACoS: The Difference, the Formulas, and Which One to Optimize The difference between TACoS and ACoS is the denominator. ACoS divides ad spend by ad-attributed sales only; TACoS divides the same ad spend by your total sales—organic plus ad. ACoS tells you how efficient a campaign is at turning ad dollars into ad sales. TACoS tells you how heavily your whole business leans on advertising. You optimize ACoS to run campaigns profitably, and you watch TACoS to see whether that advertising is actually growing the business or just renting sales. ...

What Is Amazon FBA? How It Works, Costs, and Who It’s For Amazon FBA (Fulfillment by Amazon) is a service where you send your products to Amazon’s fulfillment centers, and Amazon stores them, then picks, packs, ships, and handles customer service and returns on your behalf whenever an order comes in. In plain terms: you own and source the product, Amazon runs the warehouse and the logistics. The main reason sellers choose it is that FBA items become Prime-eligible, which unlocks fast delivery and the buying trust that comes with the Prime badge (data checked 2026-07-19, per Amazon’s official Fulfillment by Amazon page). ...

ACOS Meaning for Amazon Sellers: Definition, Formula, Benchmarks, and How to Lower It ACOS (Advertising Cost of Sales) is the percentage of your ad-attributed revenue that you spent on advertising to earn it. You calculate it by dividing ad spend by ad sales and multiplying by 100. If you spend $100 on Sponsored Products and those clicks generate $500 in sales, your ACOS is 20%. A lower ACOS means more efficient ad spend, but “lower” is not automatically “better”—the number that matters is whether your ACOS sits below your profit margin. ...

Amazon Fake Review Checker Tools in 2026: How Detection Works and Which Ones Still Run An Amazon fake review checker is a tool that scans a listing’s reviews and estimates how many are genuine—usually returning an adjusted rating or a letter grade so you can see past the raw star count. The catch in 2026 is that the two names everyone remembers, Fakespot and ReviewMeta, are both gone, and most “best fake review checker” lists you’ll find still point to dead tools. This guide covers what actually works today, how the detection works under the hood, and how to read the signals yourself when no tool is handy. ...