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Type any Amazon Best Seller Rank, get an estimated monthly sales count. Same logic Helium 10 + Jungle Scout use. Updated for 2026 US marketplace data.
Amazon's BSR updates hourly based on recent sales velocity. The relationship between rank and sales follows a power-law curve — rank 1 might sell 50,000+ units/month, while rank 100,000 might sell less than 10. The drop-off is brutal at the top, gentler in the long tail.
Tools like Helium 10 (Cerebro), Jungle Scout (Sales Estimator), and Viral Launch use scraped data from millions of products to build category-specific curves. This calculator uses the same approach with publicly available data from 2026.
Tons of data points in this band. Estimates within ±15-20% of actual.
Long tail. Could be 1 sale/week or 1 sale/month. Estimates ±50%.
A Halloween costume at BSR 5K in October ≠ BSR 5K in February. Check Keepa for history.
BSR 1,000 in Books = 100 sales/day. BSR 1,000 in Office Products = 50 sales/day. Different curves.
Use this with:
21 steps from idea to first US sale. Free PDF.