GROSS. — free commercial calculators for UK FMCG brand teams

The Amazon Cut

What Amazon FBA takes before you see a penny. Referral, fulfilment, storage and the selling plan per unit, plus a full-year GSV-to-net margin P&L by cases sold.

What FBA takes before you see a penny. Every fee per unit, plus a full-year GSV-to-net P&L by cases sold.

The workings

Amazon FBA charges you a referral fee on the sale price, fulfilment per unit shipped, storage per unit per month, and a monthly selling plan whether you sell or not. Each fee is small. Together they routinely take 35–50% of the sale price before your cost of goods enters the conversation. This page lines them up in fee order so you can see which one is doing the damage.

Selling by the case rather than the unit changes the answer more than any fee negotiation will: fulfilment and storage are charged per shipment, so a case of 24 spreads them 24 ways. It is the difference between a listing that works and one that pays Amazon for the privilege.

The full-year block prices a year of your stated volume, selling plan included. Fees here are dated defaults — check the rate card, then check Amazon's own fee schedule, in that order.

The other calculators

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• The Listing — Model the range review before the buyer does. Week by week, with a full promo calendar behind the annual GSV-t
• The Payback — How much incremental volume a promo needs to pay itself back. Break-even in cases, and the uplift that implies
• The Stock Answer — What to order, and when, before you run out. A weekly supply plan that follows your promo calendar, in whole c
• The TikTok Cut — What TikTok Shop takes on every sale. Every fee per unit, plus a full-year GSV-to-net P&L by cases sold.
• The Line-Up — The same product across grocery, Amazon and TikTok, side by side. The biggest channel is rarely the one that p
• The Range — The whole portfolio on one till roll. Blended margin, the SKU that carries the range, and the full-year plan.
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• The Ledger — One email a month on the commercial maths of UK FMCG. No selling. The archive lives here.
• The Ledger No. 001 — Your margin is your insurance. The minimum margin that survives a halved rate of sale, worked in full.
• The Guides — The long reads behind the calculators: retailer margin, gross-to-net, FBA fees and margin benchmarks, written
• How retailer margin actually works — Front margin, back margin, margin vs mark-up and the wholesaler layer — with the arithmetic shown.
• Gross-to-net: where your revenue goes — GSV, NSV, promo funding and back margin — the waterfall between invoice and bank, and what a healthy one looks
• Amazon FBA fees in the UK — Referral, fulfilment, storage and the plan, added up honestly — plus the break-even price nobody checks.
• FMCG margin benchmarks — Indicative UK brand gross-margin ranges by category, measured on the right base and honest about being ranges.
• Payment terms in UK grocery — Sixty days is not a detail — it is working capital, and it is yours. The debtor-day maths, the shelf-fill trap
• What a promotion actually costs — Funding off invoice, the uplift with the widest error bars in the building, and the payback test nobody runs.
• The Rate Card — Every default in GROSS., what it is, when it was checked and where it comes from. The maths is only as good as

Free, no sign-up. The maths is checked; the defaults are dated and sourced on The Rate Card. VAT number: not applicable. This is a website.