Finance Tool

Amazon FBA Calculator UK

Calculate Amazon UK referral fees, FBA fulfilment, storage, VAT impact, and net profit per unit.

Net profit per unit

£9.62

Margin

38.5%

ROI

160.3%

Total Amazon fees

£6.77

Break-even price

£13.68

Pricing

Sale price (inc. VAT)

Cost price per unit

What you pay your supplier

Product category

Dimensions & Weight

Weight

For FBA fulfilment fee calculation

L (cm)

W (cm)

H (cm)

Additional Costs

Inbound shipping

Cost to ship to Amazon warehouse

Prep & labelling

Bagging, poly bags, labels

Other (PPC, ads, etc.)

Storage

Estimated months in storage

VAT & Plan

VAT Registered

Seller plan

Monthly volume

To amortise monthly fee

Sale price

+£24.99

Product cost

-£6.00

Inbound shipping

-£0.80

Prep & labelling

-£0.30

Other costs

-£1.50

Referral fee

-£3.75

FBA fulfilment

-£2.44

Storage fee

-£0.08

Seller plan

-£0.50

Net profit

+£9.62

Referral Fee

£3.75

15.0%

Fulfilment

£2.44

Large envelope small (151–400g)

Storage

£0.08

2 months

Total FBA Fees

£6.77

27.1%

Total All-in Cost

£15.37

Inc product cost

Break-even Price

£13.68

Target price

Last updated: May 2026

Why UK FBA margin math gets missed

New sellers usually focus on the visible referral fee and forget that net margin is squeezed by fulfilment fees, storage, inbound shipping, prep, seller plan costs, and VAT treatment. A product that looks profitable at first glance can become weak once the full stack is included.

How to use this calculator well

Model your net profit before ordering inventory.
Stress-test different sale prices and cost prices.
Compare FBA economics with a merchant fulfilled setup.
See whether your margin still works after VAT and storage are added.

Worked example

A small consumer product with a healthy gross spread can still disappoint if the size tier pushes fulfilment fees up or if months of storage accumulate before Q4. Use the calculator to test those scenarios before committing to a purchase order.

Related calculators

If you also sell on Amazon.ca, compare with the Amazon FBA calculator Canada.

Frequently asked questions

What fees does this Amazon FBA calculator UK include?

It helps you model referral fees, FBA fulfilment fees, storage, seller plan costs, and your own unit economics such as cost of goods, prep, and inbound shipping.

Does VAT matter when calculating Amazon UK profitability?

Yes. VAT can materially change your true margin, especially for non-VAT-registered sellers who cannot reclaim VAT charged on Amazon's fees.

Can I compare FBA with merchant fulfilled orders?

Yes. Set the FBA-specific costs to zero and move your own shipping and fulfilment costs into the editable cost fields to model a merchant fulfilled scenario.

What is a healthy FBA margin in the UK?

Many sellers target at least 20% to 30% net margin after all Amazon and product costs, because lower margins become fragile when fees, ads, or supplier costs rise.