Amazon Size Tier Calculator
The Amazon Size Tier Calculator helps sellers estimate the size tier of their product using package dimensions and weight. Amazon uses size tiers to decide fulfillment fees and storage costs. If a product moves into a larger size tier, the selling cost can increase significantly — use this tool to check before sending inventory to Amazon.
Enter Package Details
Measure the final packed product including packaging
Longest side
Middle side
Shortest side
Include packaging weight
Results appear here
Enter package details and click Calculate
What is Amazon Size Tier?
Amazon size tier is how Amazon categorizes your product based on its packaged dimensions and weight. Each tier comes with its own FBA fulfillment fee and storage fee structure.
Amazon checks three things: the longest side, the median side (middle dimension), and the shortest side — plus the total package weight.
- FBA fulfillment fees — paid per unit shipped to the buyer
- Monthly storage fees — paid per cubic foot stored
- Shipping handling costs — larger tiers cost more to handle
- Overall profit margin — higher tiers reduce margin
How to Use the Amazon Size Tier Calculator
Follow these simple steps to get your size tier estimate:
- 1Measure the length, width, and height of your fully packaged product
- 2Enter each dimension in the calculator
- 3Select the correct unit — centimetres or inches
- 4Enter the total package weight including all packaging materials
- 5Select the weight unit — grams, kg, or pounds
- 6Click Calculate Size Tier
- 7View your estimated size tier and sorted dimensions instantly
Important Tip
Always measure the final packaged product — not the bare item. Amazon measures the package that arrives at the fulfillment center.
Amazon Size Tier Rules Explained
Amazon sorts your three dimensions from longest to shortest. The calculator does this automatically. It then compares each dimension and weight against the tier thresholds below.
| Size Tier | Longest | Median | Shortest | Weight |
|---|---|---|---|---|
| Small Standard | ≤ 33 cm | ≤ 22.8 cm | ≤ 8.9 cm | ≤ 900 g |
| Large Standard | ≤ 46 cm | ≤ 35.5 cm | ≤ 35.5 cm | ≤ 9 kg |
| Small Oversize | ≤ 60 cm | ≤ 46 cm | ≤ 46 cm | ≤ 11.3 kg |
| Medium Oversize | ≤ 90 cm | ≤ 60 cm | ≤ 60 cm | ≤ 22.5 kg |
| Large Oversize | ≤ 175 cm | ≤ 100 cm | ≤ 100 cm | ≤ 31.5 kg |
| Special Oversize | > 175 cm | > 100 cm | > 100 cm | > 31.5 kg |
Thresholds shown are approximate guidelines. Amazon may apply additional checks.
Example Size Tier Calculations
Example 1
Small StandardDimensions
20 × 15 × 3 cm
Weight
250 g
Compact and lightweight — qualifies for the lowest FBA fee tier.
Example 2
Large StandardDimensions
40 × 25 × 10 cm
Weight
900 g
Within standard size range but at the upper end — review packaging.
Example 3
Medium OversizeDimensions
70 × 45 × 30 cm
Weight
4 kg
Oversize product — higher FBA fees apply. Consider packaging optimisation.
Why Amazon Size Tier Matters for Sellers
Size tier is not just a classification — it directly affects how much profit you keep from every sale.
- Estimate your FBA fees accurately before pricing your product
- Improve profit margins by reducing unnecessary packaging
- Choose between FBA and self-fulfilment based on real cost data
- Compare sourcing options with accurate cost projections
- Avoid surprise fee increases when products ship from Amazon
Even small packaging changes — trimming a few centimetres or reducing padding — can move your product into a lower tier and save meaningful money at scale.
Common Mistakes While Checking Amazon Size Tier
- Measuring the bare product instead of the final packaged unit
- Using the wrong unit — entering centimetres when inches is selected
- Forgetting to include packaging weight in the total weight
- Not rechecking dimensions after changing to a new supplier or box
- Assuming Amazon tier thresholds never change — they update periodically
- Relying on product dimensions from the manufacturer without measuring yourself
Frequently Asked Questions
Know Your Size Tier Before You Send Stock
The Amazon Size Tier Calculator helps sellers quickly estimate how Amazon may classify their product based on dimensions and weight. Understanding your size tier early can help reduce FBA fees, improve margins, and avoid costly packaging mistakes.
Use this Amazon Size Tier Calculator now to estimate your product size tier before sending inventory to Amazon.
Related Tools
Size Tier Quick Guide