Amazon sales estimator: monthly sales from Best Sellers Rank
This free Amazon sales estimator turns a Best Sellers Rank into estimated monthly sales and revenue. Enter a BSR and price, or paste an ASIN.
Uses Home & Kitchen until you pick a category. Illustrative model, labelled as an estimate.
BSR (Best Sellers Rank) is a product’s sales rank within one Amazon category. Amazon updates it hourly from recent and historical sales, and lower is better. This Amazon sales estimator turns a rank into monthly sales with a curve for each category. In our illustrative model, BSR 1,000 in Home & Kitchen is about 2,000 units a month.
How the Amazon sales estimator works
Amazon does not publish unit sales, but it does publish a Best Sellers Rank for each product. Ranks follow a steep curve: the top products sell many times more than products a few thousand places down. We fit one curve per category.
Pick the category
Home & Kitchen #1,000 ≠ Toys & Games #1,000BSR only compares products inside one category. Bigger categories need more sales to hold the same rank.
Convert rank to sales
monthly units = a × BSR^(−b)Each category has its own a and b. Sales fall fast as the rank number grows, so the curve is steep at the top.
Add price
revenue = units × price · daily units = units ÷ 30Revenue uses the price you enter. Use the average selling price, not a one-day deal price.
Read it as a range
range = estimate × 0.7 to estimate × 1.3One rank reading moves every hour. The ±30% range shows how far a single snapshot can be off.
Best Sellers Rank to monthly sales (illustrative model)
| Category | BSR 100 | BSR 1,000 | BSR 10,000 | BSR 100,000 |
|---|---|---|---|---|
| Home & Kitchen | 11,200 | 2,000 | 360 | 63 |
| Beauty & Personal Care | 14,500 | 2,400 | 400 | 66 |
| Health & Household | 13,300 | 2,200 | 370 | 61 |
| Grocery | 9,600 | 1,600 | 270 | 44 |
| Toys & Games | 8,400 | 1,500 | 270 | 47 |
| Clothing & Accessories | 7,300 | 1,400 | 270 | 51 |
| Pet Supplies | 7,500 | 1,300 | 230 | 39 |
| Sports & Outdoors | 6,600 | 1,200 | 220 | 40 |
| Tools & Home Improvement | 6,000 | 1,100 | 200 | 36 |
| Office Products | 5,500 | 1,000 | 180 | 33 |
| Baby | 4,900 | 900 | 160 | 30 |
| Electronics | 4,700 | 900 | 170 | 33 |
Estimated units per month from a per-category curve, monthly units = a × BSR^(−b). Illustrative model only: real sales at a given rank change with season and category size. Deviantly’s live model uses daily rank history.
Frequently asked questions
What does BSR mean on Amazon?
BSR means Best Sellers Rank, a product’s sales rank within one Amazon category. Amazon updates it hourly, based on recent and historical sales, so a sales spike moves it fast. Lower is better: BSR 1 is the top seller in that category. A rank only compares products in the same category, which is why this estimator asks for one.
How many sales does a BSR of 1,000 mean?
About 900 to 2,400 sales a month in our illustrative model, depending on the category. BSR 1,000 in Home & Kitchen comes out at about 2,000 units a month, while Electronics and Baby come out nearer 900. Bigger categories need more sales to hold the same rank. Check the rank over several days before you trust one number.
How accurate are Amazon sales estimates?
They are estimates, so read them as a range. Amazon does not publish unit sales, and every tool models them from rank. A single BSR reading can swing hour to hour, which is why we show ±30%. Deviantly’s live model uses daily rank history to smooth out spikes. Use estimates to compare products, not to plan stock to the unit.
Why does BSR change every hour?
Because Amazon recalculates Best Sellers Rank hourly from recent and historical sales. A few extra sales can lift a slow product thousands of places, and other sellers’ sales push yours down. Look at the trend over days or weeks. One reading on its own tells you little about monthly sales.
Where can I get Amazon sales data for many products?
In Deviantly Track. This free estimator checks one product at a time from a single rank. Track keeps daily rank history and Amazon sales data for every ASIN you follow, so you can compare products and spot trends over time. It starts with a 7-day free trial.
Related free tools
Sources: Amazon Best Sellers (“based on sales, updated hourly”) · Helium 10, What is Amazon BSR. Amazon does not publish unit sales or its rank formula. Estimates are labelled.