How to Calculate Amazon FBA Fees

(Step-by-Step Guide for 2025)

If you’re selling on Amazon, you’ve probably realized one simple truth: profits aren’t as straightforward as sales price minus cost. Amazon takes a cut through referral fees, adds fulfillment fees if you use FBA, and sometimes tacks on storage or closing fees. Without a clear calculation, you might be making less profit than you think — or even losing money.

In this guide, I’ll walk you through the exact steps to calculate Amazon FBA fees and show you how to work out your true profit margins.

Step 1: Understand the Types of Amazon FBA Fees

Before you can crunch numbers, you need to know what you’re paying for. Amazon FBA fees generally fall into three categories:

1. Referral Fees

   • A percentage of your selling price.

   • Varies by category (e.g., 15% for Clothing, 8% for Baby Products up to £10, 45% for Amazon Device Accessories).

2. Fulfillment Fees

   • Charged for picking, packing, and shipping your products through Amazon FBA.

   • Based on your product’s size tier (Small & Light, Standard Parcel, Oversize, etc.) and its weight.

3. Additional Costs

   • Storage fees (monthly or long-term).

   • Closing fees (Books, Software, Video Games, etc.).

   • Optional services like labeling or returns.

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Step 2: Note Down Your Product Details

Grab a notepad (or a spreadsheet) and list:

• Your selling price (QB)

• The category (QA)

• Your product’s weight and size tier (QE + QF)

• Your item cost (QD)

• How many units you plan to sell (QC)

These inputs are what Amazon uses to determine your fees.

Step 3: Calculate Referral Fees

Use your product’s selling price and apply the category-specific percentage.

Example:

• Selling price = £50

• Category = Electronics Accessories (15% up to £100, 8% above £100)

• Referral fee = £50 × 15% = £7.50

Step 4: Calculate FBA Fulfillment Fees

Check Amazon’s latest FBA fee table for your size tier and weight.

Example:

• Size tier = Standard Parcel

• Weight = 400g

• Fulfillment fee = £3.00 (from the 2025 UK FBA fee schedule)

Step 5: Add Item Cost

Don’t forget your own costs. This includes:

• Product cost from your supplier

• Shipping to Amazon (if applicable)

• Packaging

Example:

• Item cost = £15

Step 6: Work Out Your Net Profit

Now add it all together:

Selling price – (Referral Fee + Fulfillment Fee + Item Cost) = Net Profit

Example:

• Selling Price: £50

• Referral Fee: £7.50

• FBA Fee: £3.00

• Item Cost: £15

• Net Profit = £24.50 per unit

Step 7: Calculate Profit Margin (%)

Finally, divide your net profit by the selling price:

Net Profit % = (Net Profit ÷ Selling Price) × 100

In our example:

£24.50 ÷ £50 = 49% margin

Step 8: Use a Profit Calculator to Save Time

Manually calculating is possible, but it gets messy when you sell across multiple categories and sizes. That’s why many sellers use tools like ProfitCalcPro, which automatically applies referral and FBA fees based on category, size tier, and weight.

Instead of juggling spreadsheets, you can:

• Enter your selling price and product details

• Instantly see referral fees, fulfillment fees, and net profit %

• Adjust quantity or costs to test different scenarios

  
  

👉 Try the Free Amazon FBA Calculator here www.profitcalcpro.com