Free tool · UK FBA

Amazon FBA Profit Calculator

Estimate net profit, margin, ROI, and break-even for UK FBA arbitrage. Enter your buy cost and sell price — referral and fulfillment fees included.

Your numbers

Referral fee preset

FBA size (approx.)

Sell price on Amazon

GBP

Your cost (COGS)

GBP

Source / wholesale priceInbound shipping

GBP

To you or prep centreAmazon referral fee %

FBA fulfillment fee

GBP

Per unit pick & packOther costs

GBP

Labels, packaging

Est. units sold / month

Optional monthly projection

Net profit / unit£17.87

Margin

+71.5%

ROI

—

Break-even price

£3.96

Marketplace fees

£3.75

Auto-fill from any listing

Paste an Amazon or eBay URL in Parseflow and we pull sell price, category fees, FBA estimates, and images — then run this same profit math automatically.

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Frequently asked questions

How do I calculate Amazon FBA profit?: Subtract your cost (COGS), inbound shipping, FBA fulfillment, referral fees, and packaging from your sell price. Margin is net profit divided by sell price; ROI is net profit divided by what you invested in stock.
What referral fee does Amazon charge in the UK?: Most categories are around 15%, but electronics can be 8% and clothing around 17%. Always check your category in Seller Central — fees vary.
Is this calculator free?: Yes. No login required. Parseflow also offers auto-filled profit estimates when you extract any Amazon or eBay listing URL.