Diagnostic

Why are my Amazon sales down? Find the leaking lever in 5 minutes

By . Published July 5, 2026, rewritten October 8, 2026. Field names checked against Amazon's Business reports glossary.

Part 1

Run one check first: sessions or conversion?

Do this first

  1. Open Reports, then Business Reports, then Detail Page Sales and Traffic in Seller Central.
  2. Pull sessions and unit session percentage for the last 4 weeks.
  3. Compare each with the same 4 weeks last month and last year.
  4. Follow the branch below that matches what fell. Change nothing until you have.
The sessions or conversion fork Sales dropped. Pull sessions and conversion against last month and last year. Sessions fell with conversion holding points at Visibility. Both falling points at Operations, usually a stockout. Conversion fell with sessions holding points at Pricing, Assortment or Ratings. Your Amazon sales dropped Pull sessions and conversion.Compare with last month and last year. Sessions fell, conversion held Both fell at once Conversion fell, sessions held Visibilityrank or traffic slipped Operationssuspect a stockout Pricing, Assortment, Ratingsthe listing stopped persuading
One fork, three answers. Each lands on a lever of the Growth Loop.
  • Sales are 3 numbers multiplied. Ordered product sales is sessions times unit session percentage times average selling price, so the one that moved names the problem. Every Business Reports field, explained.
  • Unit session percentage counts units, not orders. A multipack can lift it with no more buyers.1 Read order item session percentage beside it.
  • The Sales Drop Diagnostic runs this fork on your numbers in about 1 minute, with no email.

Part 2

The 5 causes behind most drops

Do this first

  1. Check Featured Offer (Buy Box) percentage by day for a cliff.
  2. Check inventory history for any zero-stock days.
  3. Put your price beside the listing next to yours in search today.
  4. Read your 10 newest reviews.
CauseWhat fellHow fastWhere to check
Lost the Buy BoxConversionSame dayFeatured Offer percentage by day, in Business Reports
Organic rank slippedSessionsGradualOrganic rank on your top 3 search terms, week over week
Price stopped being competitiveConversionFastYour price against the listing beside yours in search today
Ran out of stock, or nearlyBothFastIn-stock rate and any zero-inventory hours
A new negative review on topConversionOvernightYour 10 newest reviews and the displayed star rating

Ordered most binary first, because those cut fastest. Mike Begg's 2026 checklist of 9 causes names the same suspects.2

  • A lost Buy Box can erase units the same day. It usually flips on a rival's price, your low stock, or a slipped account metric. The 5 Buy Box checks.
  • A stockout costs rank on top of the missed sales. Organic placement takes 6 to 7 days to recover after a stockout of 2 days or more,3 and longer stockouts cost more keyword rank.4
  • Sponsored ads crowd the first screen in 2026, so organic slots are harder to hold once rank slips.5
  • Negative reviews move sales more than positive ones. That held for book sales,6 and each Yelp star lifted independent restaurants' revenue 5 to 9%.7 Reviews vanishing instead?

Part 3

Before you panic: 3 drops that aren't a broken listing

Do this first

  1. Compare the same weeks last year, not just last month.
  2. Add up Shopify, wholesale and Walmart for the same weeks.
  3. Check ad spend and cost per click against the same weeks.
  • Seasonality. A month-over-month chart turns every January into a crisis. The same weeks last year is the baseline.
  • Demand moved channel. In our fictional Kestrel Kitchen sample, Amazon sales fell 20.8% over 13 weeks while the whole business grew 11.3%. Amazon down, Shopify up: the 3 checks.
  • A rating that slides quietly. A drop from 4.3 to 3.9 stars sends no alert, and the conversion it costs looks like a traffic problem a month later. Across 7 brands, 40 to 55% of 1-star reviews traced to the listing instead of the product (our research).

Part 4

Common questions

Why did my Amazon sales suddenly drop overnight?

Something binary changed: you lost the Buy Box, went out of stock, or a competitor undercut your price. Check those 3 first. A slow decline is more often rank or rating.

How do I tell if it's a traffic problem or a conversion problem?

Compare sessions and unit session percentage in Business Reports with the same 4 weeks last month and last year. Sessions down is traffic, conversion down is the listing, both down is usually a stockout.

Can one bad review really drop my Amazon sales?

Yes. A recent negative review can surface near the top of the listing and cut conversion overnight while traffic holds. Negative reviews moved book sales more than positive ones in Chevalier and Mayzlin's 2006 study.

How long does it take to recover rank after a stockout?

Organic placement takes 6 to 7 days to recover after a stockout of 2 days or more, and longer stockouts cost more rank.

My price is the same as always. Why are sales still down?

Price is relative. If a competitor cut theirs, your unchanged price became the expensive option. Check it against the listing beside yours in Amazon search today.

Have the fork run on every channel, every month

Sentopi's monthly report adds up the whole business, tests each likely cause and ranks the actions, the way the Kestrel sample does. The first month is free, and we never log in to your accounts.

Get your first month free Check one listing in 30 seconds

Sources

  1. Amazon Seller Central. Business reports glossary. Read October 7, 2026. Link
  2. Begg, M. (2026). Why are my Amazon sales down? 9 real reasons. Link
  3. Profitero. Assortment and availability playbook. Read October 8, 2026. Link
  4. 8fig (2024). Running out of stock on Amazon. Link
  5. Amzigo (2026). Why Amazon sales are down in 2026, and why reviews matter more than ever. Link
  6. Chevalier, J. A. and Mayzlin, D. (2006). The Effect of Word of Mouth on Sales: Online Book Reviews. Journal of Marketing Research 43(3). Link
  7. Luca, M. (2016). Reviews, Reputation, and Revenue: The Case of Yelp.com. Harvard Business School Working Paper 12-016. Link

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