GROSS. — free commercial calculators for UK FMCG brand teams

The Line-Up

Net margin on the same product across grocery, Amazon FBA and TikTok Shop, side by side. The biggest channel is rarely the one that pays.

The same product across grocery, Amazon and TikTok, side by side. The biggest channel is rarely the one that pays.

The workings

The same product earns a different margin in every channel, and the ranking is rarely the one the revenue suggests. Grocery pays less per unit and moves volume; marketplaces pay more per unit and take fees that grow with every service you lean on. This page prices one unit through each channel with the same cost of goods and the same freight, and ranks what is left.

The number to watch is gross profit per unit after landed cost, not revenue and not percentage margin. A channel that pays you £0.40 a unit on 200,000 units beats one that pays £0.90 on 20,000 — but only if you have the cash to fund the volume, which is a different page (The Wait).

Break-even sale price per channel is printed at the bottom: the shelf price below which the channel pays you nothing. Everything above it is negotiation.

The other calculators

• Home — Free commercial calculators for UK FMCG brand teams. Retailer margins, gross-to-net, trade spend payback, supp
• The Shelf — Your range, defined once. Enter each product’s cost price, RSP, units per case and rate of sale — every calcul
• The P&L — See what the retailer really makes on you. Reads top-down: shelf price, VAT, who takes what, and what you actu
• The Waterfall — Every deduction between the shelf price and your bank. Gross to net net, with promo funding, back margin and o
• The Floor — The lowest cost price, or the RRP, that still clears your target margin. Solved backwards from the number you
• 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 Amazon Cut — 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 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 Range — The whole portfolio on one till roll. Blended margin, the SKU that carries the range, and the full-year plan.
• The Wait — Margin is an opinion; cash is a fact. When the money actually moves — and the gap your bank account has to sur
• 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.