Amazon doesn't publish sales numbers. It publishes clues — the “bought in past month” badge and the Best Sellers Rank — and leaves you to guess what they add up to. Soldometer reads both, does the arithmetic in the open, and gives you a monthly figure with its working shown. The Chrome extension does all of it automatically, right on the Amazon page.
Free Chrome extensionAutomatic — right on the Amazon page10 Amazon marketplacesBadge-first — Amazon's own number
Extension launch pricing is set: the first 1,000 activations are Founding Members — free forever. After that, everyone gets their first week free, then $5/month.
The Soldometer Chrome extension runs this exact estimator automatically on Amazon product pages across Canada, the US, the UK, Germany, France, Italy, Spain, Australia, India and Japan — badge, rank, price and reviews read live from the page, the card sitting right on the listing. It is live on the Chrome Web Store now, free to install — and the pricing below already applies: the first 1,000 people to activate become Founding Members, free forever. Everyone after that starts with a free week.
amazon.caSearch Amazon.caCart
Grocery & Gourmet Food › Coffee › Whole Bean
Kicking Horse Coffee, Three Sisters, Medium Roast, Whole Bean, 1 lb
★★★★☆ 4.6
3K+ bought in past month
CA$17.00
Ships from: Amazon.ca · Sold by: Amazon.ca
Soldometer · on this listingStrong
3,330 est. units / mo
RevenueCA$56,610 / mo
Buy BoxAmazon.ca
Amazon selling?Yes
Source3K+ bought badge
Badge-first estimate: a 3K+ badge is a range — 3,000–3,999 sold. The pick, 3,330, comes from inside it.
The extension's card on a listing, drawn the way it actually renders. The badge says 3K+; the card does the rest — including the Buy Box line, which here says the seller you'd be up against is Amazon itself.
On a Best Sellers page, every tile wears the slim banner — units, revenue, and where the number came from. No clicking through to find out.
Sales estimator — the manual web version
This is the by-hand demo of what the extension does automatically. Fill in what you can see on the listing — the badge alone is enough, BSR sharpens the cross-check — or skip the typing: the extension above reads the page for you.
Copy it exactly as Amazon shows it, or tap one:
Profit check — what would you net per unit?
Rough default — edit it. Varies by size & weight.
Net = price − 15% Amazon referral fee − FBA fee − your cost. An estimate, not a fee quote.
Estimated sales
5,330 units / mo
Hot
Likely range 5,000 – 5,999 units · ~178/day
Worked example — Apple EarPods (USB-C), Amazon.ca
Revenue / month
CA$133,143
Revenue / year
CA$1,597,721
Units / day
178
New reviews / mo
53–160 est.
Profit check
Price
Amazon referral fee (15%)
FBA fee (your estimate)
Your unit cost
Net per unit
Margin
Est. profit / month at this volume
All figures are estimates. Amazon never publishes exact sales for a listing — see how accurate this is.
AdvertisementAd space — 300 × 250 rectangle
→
Soldometer on your phone
On your phone, the manual estimator above is the quick check — it runs right in your mobile browser, nothing to install. Checking a product before you buy it takes about ten seconds: read the “bought in past month” badge or the Best Sellers Rank off the listing, type it in, and get the estimate — units, revenue, and the profit check — before it goes in the cart.
Just know what you're holding: on a phone it's the manual version — you bring the numbers. The automatic version that reads Amazon pages for you is the Chrome extension on desktop. If you're reading this on your phone, the move is to add it when you're next at your computer — after that, every listing you open gets its card on its own.
AdvertisementAd space — in-content rectangle
02
How the estimate works
Two public signals, used in the right order. Most tools bury this; here it is in the open, because a number you can't explain is a number you shouldn't act on.
SIGNAL 01Amazon's own bought badgePrimary
Listings show “5K+ bought in past month.” That's Amazon's measured sales, bucketed into a range: 5K+ means 5,000 to 5,999 sold. We show that range as the likely range and pick the headline figure from inside it — never above the top of the bucket. When the badge exists, it wins — it's the seller's own platform reporting its own tills.
SIGNAL 02Best Sellers Rank curveFallback
No badge? We model sales from Best Sellers Rank with a category power law: units = A × BSR−b. Each category has its own curve, because rank #500 in Pet Supplies is a very different business from rank #500 in Books. BSR estimates carry a wider ±40% range — treat them as a compass, not a counter.
SIGNAL 03The two signals audit each otherReality check
Enter both and we cross-check them. If rank and badge disagree by more than 3×, we say so on the result and trust the badge — ranks go stale and subcategory ranks flatter a listing, while the badge is refreshed from actual orders.
monthly units = A × BSR^(−b) × marketplace scale
Calibrated to published anchors: US Pet Supplies at BSR ~516 ≈ 11,600 units/mo, and US Home & Kitchen at BSR 100 ≈ 6,000 units/mo (~200/day). Amazon.ca moves roughly 12% of Amazon.com's volume at the same rank, so .ca BSR estimates are scaled by 0.12 — a #100 rank in Canada is a much smaller market than a #100 rank in the US, and the tool prices that in instead of flattering you.
03
Finding the badge and the rank on any listing
Everything the estimator needs is printed on the product page itself. It takes about twenty seconds.
1
Open the product page
On Amazon.ca or Amazon.com, open the exact variant you'd buy — different sizes and pack counts can have different badges.
2
Read the badge under the title
Just below the rating stars you'll often see text like “5K+ bought in past month.” Copy it exactly — the K means thousands, so 5K+ enters as 5K+. No badge? The listing likely sells under ~50/month, or Amazon hasn't shown one for it; use the rank instead.
3
Scroll to “Product information”
Find Best Sellers Rank, e.g. “#45 in Beauty & Personal Care.” Use the first, main-category rank, not a subcategory rank further down the line — subcategory ranks make slow products look fast.
4
Note the price, then estimate
Enter the price the badge belongs with (watch for coupons and variant pricing), pick the main category, and run it. Revenue is simply units × price — which is why a $25 product at 1,000/mo can beat a $9 product at 4,000/mo.
04
Reading your result
The verdict is a plain-English read on monthly unit velocity. It describes this listing's demand — not whether the niche is open to you. A Hot listing with 40,000 reviews is proven demand behind a very high wall; a Steady listing with 300 reviews may be the better door.
Verdict
Units / month
What it usually means
Hot
5,000+
Serious volume. Expect entrenched incumbents, real ad spend, and price pressure.
Strong
1,000 – 4,999
A real business is happening here. Worth a hard look at reviews and margins.
Steady
300 – 999
Dependable niche demand. Often the sweet spot for a smaller seller.
Slow
50 – 299
Thin. Only works with strong margin, a bundle, or near-zero competition.
Barely selling
Under 50
Walk away unless you know something the listing doesn't show.
Also on the result: the likely range (plan on the low end, hope for the middle), revenue (units × price, before any fees), and estimated new reviews per month — roughly 1–3% of buyers review, so a listing gaining 100+ reviews a month is compounding its moat fast. Run the profit check before falling in love with any revenue number: 15% referral fee plus FBA quietly eats a third of many prices.
05
Pricing — Founding 1,000, then $5/month
The estimator on this page stays free. The Chrome extension is where pricing lives — and it's deliberately simple: be early and you never pay. Arrive after the founding spots are gone and you still get a full week free before anything is charged.
First 1,000 activations · Limited
Founding Member
$0 forever
For the first 1,000 people to activate the extension after its Web Store launch. One claim per person, tied to your account so it follows you across computers.
Free forever — no card, no trial clock, no expiry
Full extension: product-page card + tile banners everywhere
Claims are numbered in the order activations complete — downloading alone doesn't count, you have to open the extension and claim. When the counter hits 1,000, this tier closes for good.
Activation 1,001 onward
Standard
$5 / month
First week free, then $5/month. Same full extension as Founding — no feature tiers, no upsell wall inside the tool.
First week free — full access from day one
Then $5/month, cancel anytime in two clicks
Full extension: product-page card + tile banners everywhere
Your first week is free — no card required to start it, and nothing is charged during it. When it ends, subscribe at $5/month only if you want to keep going; cancel anytime. Payments run through ExtensionPay + Stripe (standard processor fees apply), and subscriptions only activate on Web Store–installed copies.
1 · Install freeEveryone installs free from the Chrome Web Store. No paywall on the download itself.
2 · Activate & claimOn first use you claim with an email. Claims 1–1,000 are stamped Founding; the live counter shows spots left.
3 · After 1,000New activations start the free week automatically. Your first charge happens only if you choose to subscribe when the free week ends — $5/month, cancel anytime. If you don't subscribe, you pay nothing.
Where things stand today: the extension is live on the Chrome Web Store and founding claims are open — the counter on the Founding card above is live and counts activations as they complete. The website estimator above remains free regardless — no account, nothing to claim.
Estimating Amazon sales accurately — an honest guide
First, the limit nobody can remove
Amazon does not publish how many units a competitor's listing sells. Not to us, not to anyone. Every sales figure from any third-party tool, this page included, is an estimate built from public signals like the bought badge and Best Sellers Rank. Any tool that shows you a number like “7,342 units” with no range is dressing up a guess as a measurement. That's why Soldometer always shows the likely range beside the headline number.
Why the badge beats the rank
The “bought in past month” badge is the closest thing to ground truth a public signal gets: it's Amazon summarising its own order data. Its weakness is coarseness — it's a floor in a bucket, so 5K+ could be 5,100 or nearly the next bucket up. Best Sellers Rank is finer-grained but indirect: rank is relative to every other product in the category, it moves with category-wide seasonality, and a listing's rank can be hours or days stale. Use the badge for the headline, the rank as the audit.
The Canada adjustment most tools skip
Amazon.ca is a much smaller marketplace than Amazon.com — roughly an eighth to a tenth of the volume at the same rank. Tools calibrated on US data and applied blindly to .ca listings overstate Canadian sales by up to 8×. Soldometer scales .ca BSR estimates by 0.12 automatically. (The badge needs no scaling — 5K+ bought means 5,000 buyers on either marketplace.)
What an estimate can't tell you
Velocity is not opportunity. A 6,000/mo listing tells you demand exists; it says nothing about the 44,000 reviews defending it, the brand's ad budget, return rates, or whether the price you see survives coupons and Subscribe & Save. And a single snapshot hides trend — a badge photographed in December describes December. Serious research re-checks a listing across weeks and reads the one- and two-star reviews for the opening a new product could walk through. Use this tool to shortlist fast, then do that slower work on the survivors.
A worked example, verified end to end
Apple EarPods (USB-C) on Amazon.ca: $24.98, showing a 5K+ bought badge and 18,682 reviews. Badge-first math: the 5K+ badge is a range of 5,000–5,999 sold, and the pick from inside it is 5,330 units/month, revenue CA$133,143/month, verdict Hot. That's pre-loaded in the estimator above — tap “Load the EarPods example” and change one input at a time to feel how sensitive the outputs are.
07
Frequently asked questions
How accurate is this Amazon sales estimator?
When a “bought in past month” badge is available, the estimate is anchored to Amazon's own measured sales and the headline figure is picked from inside the badge's own range — a 5K+ badge means 5,000–5,999 sold — so it starts from Amazon's measured range instead of a multiplier that can overshoot the bucket. Rank-only estimates are rougher — plan on the ±40% range shown. No third-party tool, paid or free, can do fundamentally better, because Amazon never publishes exact per-listing sales.
Why does the badge beat Best Sellers Rank?
The badge is Amazon summarising its own order data for that listing. BSR is relative (it depends on every other product in the category), can be stale, and is easily flattered by subcategory ranks. When both exist and disagree by more than 3×, Soldometer trusts the badge and tells you why on the result.
What's the difference between Amazon.ca and Amazon.com estimates?
The badge means the same on both — a floor of actual buyers. BSR does not: Amazon.ca sells roughly 12% of Amazon.com's volume at the same rank, so .ca rank-based estimates are scaled down automatically when you pick the .ca marketplace. Revenue is shown in CAD for .ca and USD for .com.
The listing has no badge. Can I still estimate it?
Yes — enter its Best Sellers Rank and main category. Listings without a badge often sell under ~50 units/month, so a rank-based estimate is frequently the only signal available. Just respect the wider ±40% range on the result.
Does it work for books?
Yes — Books has its own calibration curve (book ranks behave differently: a much deeper catalogue and longer tail). Enter the rank in Books. Note that a book's badge, when shown, still wins over the rank, and Kindle and paperback editions rank separately.
Why do different tools give different numbers for the same listing?
Because every estimator works from the same public signals — the bought badge and Best Sellers Rank — but each applies its own calibration: how it converts a badge floor into a headline figure, and how its rank curve is shaped for each category and marketplace. Different calibration, different number. That's exactly why Soldometer publishes its method, its calibration anchors, and a likely range on every estimate, so you can judge the figure instead of taking it on faith.
Is anything I type here tracked or sent anywhere?
No. The estimator runs entirely in your browser; there are no accounts and nothing you enter is transmitted or stored. If advertising is enabled on this page, Google may use cookies to serve ads — see the Privacy Policy below for details and opt-out links.
Can I see estimates automatically while I browse Amazon?
Yes — that's the Soldometer Chrome extension. It reads the badge, rank, price and reviews directly from the Amazon pages you open and shows the estimate on the page, using the identical model as this site.
How do I pin the extension to my toolbar?
After installing, click the puzzle-piece (Extensions) icon at the top right of Chrome, find Soldometer in the list, and click the pin icon beside it. The Soldometer button then stays on your toolbar — that's where you claim your founding spot, manage your subscription, and set your profit thresholds. Estimates on Amazon pages work whether or not it's pinned.
How do I activate Soldometer?
Four quick steps. 1. Install the extension from the Chrome Web Store. 2. Pin it: click the puzzle-piece (Extensions) icon at the top right of Chrome, find Soldometer, and click the pin beside it. 3. Click the Soldometer toolbar icon, enter your email in the Account section, and click Claim my spot — no password, no card. 4. The popup confirms your status immediately: Founding Member with your claim number (free forever) while spots last; after they're gone, activation starts your free week, then $5/month only if you stay. Activate within 7 days of first use — after that the copy locks until you activate. Use an email you control, because it's your key: reinstall one day and entering the same email restores your spot and status (capitalization doesn't matter). One spot per person.
How does the Founding 1,000 pricing work?
Everyone installs the extension free from the Chrome Web Store. On first use you activate with an email and your claim is numbered in order. Claims 1–1,000 are Founding Members — free forever, no card required. Claim 1,001 onward starts a free week; after that it's $5/month if you stay. Downloading alone doesn't reserve a spot — activation does, which keeps the count honest.
What happens after my free week?
If you activated after the founding spots filled, your first week is free with full access — no card required, and nothing is charged during it. When the free week ends you can subscribe at $5/month to keep going; if you don't, access simply pauses and you've paid nothing. Subscriptions renew monthly and you can cancel anytime. Founding Members are never charged.
Is this website estimator still free?
Yes. The estimator on this page stays free with no sign-up, whether or not you use the extension. Pricing only applies to the Chrome extension after its Web Store launch.
When can I claim a founding spot?
Right now — the Chrome Web Store listing is live and the counter in the Pricing section is running. Install the extension, open its popup, and activate with your email; claims are numbered in the order activations happen. Downloading alone doesn't reserve a spot — activation does — and you have 7 days from first use to activate before the copy locks.
08
About Soldometer
Soldometer was built for independent Amazon sellers doing product research the way it actually gets done: open a listing, ask “is this selling, and could the math work for me?”, get a straight answer with its working shown. It started as a private research tool, became a Chrome extension that overlays estimates on Amazon pages, and this public estimator is the version anyone can use with nothing to install.
Soldometer is an independent tool built in Vancouver, Canada. Not affiliated with Amazon.
Contact: questions, corrections, or calibration sightings (a listing whose badge and rank tell an interesting story) — [email protected].
09
Privacy policy
This tool collects nothing. There are no accounts and no server receiving your inputs — every calculation happens in your browser and is gone when you close the tab. Page visits themselves are counted in aggregate by Cloudflare Web Analytics (no cookies, no cross-site tracking) — see the full Privacy Policy.
Advertising. If ad slots on this page are active, they're served by Google AdSense. Google and its partners may use cookies to serve ads based on your prior visits to this and other sites. You can opt out of personalised advertising at Google Ads Settings, and learn how Google uses data from partner sites at policies.google.com/technologies/partner-sites. When ads are not configured, the slots show empty placeholders and no ad code loads at all.
Soldometer