Determine product size tier and expected FBA fulfillment fees.
Last updated: - Amazon 2026 fee rates
Enter product dimensions and click "Determine Size Tier"
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Size tier = f(longest side, median side, shortest side, weight) per Amazon 2026 tables
A 12×8×4 in, 1.2 lb item often lands in standard-size tier — oversized dimensions jump fees sharply.
Estimates use Amazon's published fee structure. See our fee accuracy report for verification details and limitations.
Amazon categorizes products into size tiers (Small Standard, Large Standard, Small Oversize, Medium Oversize, Large Oversize) based on dimensions and weight. Each tier has different FBA fees.
Measure the longest side, median side, and shortest side in inches. Also measure weight in pounds. The calculator will determine your size tier automatically.
Length plus girth is calculated as: longest side + (2 × median side) + (2 × shortest side). This metric is used to determine oversize tier classification.
Yes, by optimizing packaging to reduce dimensions and weight. Smaller size tiers have lower FBA fees, which can significantly improve profitability.
Size tier criteria are generally similar across marketplaces, but FBA fees vary. Use our calculator to see fees for your specific marketplace.
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