Amazon's size tier system determines your FBA fulfillment fees. Understanding and optimizing your size tier can significantly impact profitability.

What are Amazon Size Tiers?

Amazon categorizes products into size tiers based on:

• Dimensions: Length, width, height
• Weight: Product weight
• Length + Girth: For oversize items

Each tier has different FBA fulfillment fees. Smaller tiers = lower fees = higher profit.

Standard Size Tiers

• Small Standard: Up to 15" × 12" × 0.75", up to 1 lb
• Large Standard: Up to 20" × 14" × 8", up to 20 lbs

Standard size items have lower fees and are easier to fulfill.

Oversize Tiers

• Small Oversize: Larger than standard, up to 71 lbs
• Medium Oversize: Even larger, up to 150 lbs
• Large Oversize: Largest items, up to 150 lbs

Oversize items have significantly higher fees due to special handling requirements.

How Size Tier Affects Fees

FBA fees vary dramatically by size tier:

• Small Standard: ~$3.22 per unit
• Large Standard: ~$4.75 per unit
• Small Oversize: ~$8.26+ per unit
• Large Oversize: ~$75+ per unit

Moving from Large Standard to Small Standard can save $1.50+ per unit!

Real-World Example

Let's say you have a product:

• Dimensions: 12" × 10" × 8"
• Weight: 1.5 lbs
• Current tier: Large Standard
• FBA fee: $4.75

If you optimize packaging to 12" × 10" × 0.75":

• New tier: Small Standard
• New FBA fee: $3.22
• Savings: $1.53 per unit

If you sell 100 units/month, that's $153/month or $1,836/year in savings!

How to Optimize Size Tier

• Reduce packaging: Use minimal packaging
• Optimize dimensions: Make one dimension very small
• Reduce weight: Lighter products = lower fees
• Check before production: Design with size tier in mind

Size Tier Calculator

Our calculator helps you:

• Determine your product's size tier
• Calculate expected FBA fees
• Compare fees across tiers
• Optimize packaging