The Amazon FBA Calculator is a tool designed to help UK sellers determine the fees associated with Fulfilment by Amazon. It calculates Amazon FBA fees, referral fees, and profit per unit, making it essential for anyone selling on Amazon to understand their potential earnings.
How Amazon FBA Calculator works in 2026
The Amazon FBA Calculator works by taking into account various fees and charges that sellers incur when using Amazon’s FBA service. These include storage fees, fulfilment fees, and referral fees. As of 2026, sellers need to be aware of the monthly storage fee of £0.75 per cubic foot for standard-size items and £0.48 for oversized items, according to Amazon's updated fee structure.
Fulfilment fees depend on the size and weight of the product. For example, a standard-size item weighing less than 1 kg incurs a fee of £2.00 per unit. Larger items will have higher fees. Referral fees are typically a percentage of the selling price, often around 15%, but this can vary by category. Sellers should consult Amazon’s fee schedule for specific categories.
Using the Amazon FBA Calculator helps sellers forecast their costs and profits accurately. By inputting product dimensions, weight, and selling price, sellers can see a breakdown of expected fees. This allows them to adjust pricing strategies accordingly. HMRC may also require sellers to track these fees for tax purposes, so maintaining accurate records is crucial.
When to use Amazon FBA Calculator
Use this tool in the following scenarios:
- Scenario 1: Launching a new product line on Amazon UK.
- Scenario 2: Reviewing profitability of existing products due to fee changes.
- Scenario 3: Calculating the impact of seasonal storage fees increases.
- Scenario 4: Estimating costs before entering a new product category.
Key UK rates / thresholds for 2026
Key figures for 2026 are essential when using the calculator.
| What | Rate / threshold | Notes |
|---|---|---|
| Standard storage fee | £0.75 per cubic foot | Applies to standard-size items |
| Oversized storage fee | £0.48 per cubic foot | Applies to oversized items |
| Fulfilment fee (under 1kg) | £2.00 per unit | Standard-size item under 1kg |
| Referral fee | 15% of selling price | Varies by category |
Worked example
Consider a UK seller offering a kitchen gadget priced at £20. The item is standard size, weighing 0.8 kg, and occupies 0.5 cubic feet. The fulfilment fee is £2.00, and the monthly storage fee is £0.375 (0.5 cubic feet at £0.75 per cubic foot). The referral fee is £3.00 (15% of £20). Total Amazon fees are £5.375 per unit. To find the profit per unit: £20 selling price minus £5.375 fees equals £14.625 profit. This calculation helps determine if the business model is viable.
Common mistakes
- Underestimating storage fees. Check item dimensions and adjust accordingly.
- Ignoring seasonal fee variations. Amazon increases fees during peak seasons.
- Overlooking category-specific referral fees. Always verify with Amazon’s fee schedule.
- Failing to account for VAT. Ensure VAT considerations are included in calculations.
Related calculations
Sellers often need to calculate VAT on their sales alongside FBA fees. Understanding EORI requirements for imports is also crucial. Registering for VAT with HMRC and ensuring compliance with import duties are related tasks often performed together.
What HMRC checks
HMRC requires detailed records of all transactions, including fees and profits. Keep records for at least six years. Inconsistent records or discrepancies in VAT returns can trigger investigations. Ensure accurate and timely submissions to avoid penalties.
Bottom line
The Amazon FBA Calculator is an invaluable tool for UK sellers to assess the profitability of their products on Amazon. By understanding and calculating all relevant fees, sellers can strategically price their products and maximise profits. Regularly update your calculations with current rates to maintain accuracy and compliance with HMRC regulations.