Amazon FBA UK Profit Calculator
Amazon UK takes three separate cuts from an FBA sale: a referral fee of 8–45% by category, a fulfilment fee set by which of Amazon's 13 size tiers the packed item falls into, and monthly storage. On a £18.99 item measuring 25×18×8 cm and weighing 300 g, that is £2.85 referral, £3.04 fulfilment and £0.19 storage — leaving £6.64 profit after a £5.20 product cost. Rates below follow Amazon's published UK rate card effective 2026-07-01.
| Sale price | £18.99 |
|---|---|
| Referral fee (15.0%) | −£2.85 |
| FBA fulfillment fee — Small parcel | −£3.04 |
| Storage (2 mo) | −£0.19 |
| Professional plan, amortised | −£0.17 |
| Product cost | −£5.20 |
| Ship to Amazon | −£0.60 |
| Prep, labels & other costs | −£0.30 |
| Size tierFits within 35 x 25 x 12 cm, weighs 3.90 kg or less, and dimensional weight is 2.10 kg or less. | Small parcel |
| Billable weightDimensional weight (720.00 oz) exceeded the actual weight, so Amazon bills the larger figure. | 720.00 oz |
| Net profit per unit | £6.64 |
Dimensional weight is driving your fulfillment fee. Shrinking the package is worth more than shaving grams off the product.
How the Amazon UK FBA fee calculation works
The shape of the calculation is the same three charges as any Amazon marketplace — referral fee, fulfilment fee, storage — but the fulfilment side works from a genuinely different rate card than the US, not a currency conversion of it.
The referral fee
A percentage of the sale price, set by category, most commonly 15%. Amazon Device Accessories is 45% flat. Automotive & Powersports is genuinely marginal — 15% on the first £45 of the price and 9% on the rest, unlike the US equivalent category, which is a flat 12% regardless of price. A minimum referral fee of £0.25 applies per item in most categories, rising to £20 or £25 for Heavy Oversize and Heavy Bulky items respectively — see the FAQ below.
The fulfilment fee: 13 tiers, and dimensional weight can gate more than billing
Amazon UK sorts every FBA item into one of thirteen size tiers — four envelope tiers, two parcel tiers, and seven oversize tiers — each with its own dimension limit, weight limit, and fee table. The tier decides the fee table; the billable weight decides which row of that table applies.
For parcel and most oversize tiers, dimensional weight does a second job the US system doesn't have: it is also part of deciding which tier an item qualifies for in the first place. Small parcel requires both unit weight ≤3.90 kg and dimensional weight ≤2.10 kg — an item can be small and light on the scale and still fail Small parcel on dimensional weight alone, landing in Standard parcel instead at a higher fee. Envelopes are the exception: Light, Standard, Large, and Extra-large envelope are all billed on actual weight only, regardless of shape, per Amazon's own stated rule.
Storage
Charged monthly per cubic foot — Amazon prices UK storage in £ per cubic foot even though every dimension and weight elsewhere on the UK rate card is metric. Standard-size inventory costs £0.76 per cubic foot per month from January to September and £1.51 from October to December. Oversize is £0.55 and £0.87.
A worked example with real numbers
A 25 × 18 × 8 cm item, 300 g, sold at £18.99
Cost from the supplier is £5.20, inbound freight is £0.60 a unit, and prep is £0.30. It sells in a standard 15% category and sits in the warehouse about 2 months before selling.
Step 1 — size tier. The packed dimensions are 25 × 18 × 8 cm, too deep for any of the four envelope tiers, so it lands in Small parcel. Dimensional weight is (25 × 18 × 8) ÷ 5,000 = 0.720 kg = 720 g. Actual weight is 300 g, so billable weight is the dimensional figure = 720 g — more than double what the item weighs on the scale.
Step 2 — the three fees.
| Charge | How it is worked out | Amount |
|---|---|---|
| Referral fee | 15% of £18.99 | £2.85 |
| FBA fulfilment | Small parcel table at 720 g | £3.04 |
| Storage | 0.1271 cu ft × £0.76 × 2 months | £0.19 |
| Professional plan | £25.00 ÷ 150 units | £0.17 |
| Total Amazon fees | £6.25 | |
| Product cost | from supplier | £5.20 |
| Inbound + prep | freight and labels | £0.90 |
| Net profit | £6.64 |
Step 3 — what that means. Net margin is 35.0% and ROI on the £6.10 you laid out is 109%. The break-even sale price is £11.18 — below that the product loses money on every unit. None of this includes VAT; see the FAQ below for why.
Who this is for
UK-based FBA sellers, and US sellers weighing up whether to expand onto Amazon.co.uk, deciding whether a product that works in the US rate card still works once it's priced against a genuinely different UK fee structure — not the same numbers in a different currency symbol. It's most useful at the same two moments as the US version: before placing a first order with a supplier, and when deciding how much room there is to match a competitor's price.
It is also the fastest way to see whether your packaging is quietly moving you into a more expensive tier. Enter your current box dimensions, then try dimensions a centimetre smaller in each direction — if the tier changes, you've found a fee reduction that costs nothing but a conversation with your supplier.
What this does not account for
- VAT. Every figure here, including Amazon's own fees, is pre-VAT. See the FAQ above for what that means for a VAT-registered versus non-registered seller.
- The 1.5% fuel and logistics surcharge announced for UK/EU fulfilment fees from 17 April 2026, not yet reflected in the rate data below.
- Advertising. Not modelled here at all, same as the US version — a healthy margin before PPC can look very different after it.
- Returns and refunds, inbound placement, and low-inventory-level fees — situational, real, and the same mechanism as the US version of this tool.
- Currency conversion if you are paid into a non-GBP account, or if you sell cross-border into the EU under Pan-European FBA, which carries its own surcharge structure not modelled here.
Sources and dates
Fulfilment fee tiers, weight brackets, storage rates, and account fees come from Amazon's own published UK rate card, listed in full below with the date it was checked. The referral fee category list here is a verified subset of the full UK rate card, not yet the complete ~35-category table — categories not listed fall back to the 15% default. If a figure here disagrees with what Seller Central shows you, trust Seller Central and tell us so it gets fixed.
Questions people actually ask about this
Why does the UK have 13 size tiers when the US calculator only has 7?
Because Amazon prices small, light, letterbox-shaped items much more finely in the UK and EU than in the US. Where the US has one "small standard" tier for anything under 15×12×0.75 in and 16 oz, the UK splits that same space into four separate envelope tiers — Light, Standard, Large, and Extra-large envelope — each with its own weight ladder up to 20g, 460g, and 960g. A greetings card, a phone case, and a folded T-shirt can all be "envelope-sized" and still land in three different fee tiers depending on thickness and weight alone.
Below that sit two parcel tiers and six oversize tiers, thirteen in total. This calculator resolves the real tier from your dimensions and weight rather than assuming the US shape maps across.
Can an item fit inside a tier's box and still not qualify for it?
Yes, and this is the part that catches out sellers used to the US model. In the US, dimensional weight only affects how much you're billed once a tier is decided by physical size and actual weight. In the UK, Small parcel and Standard parcel each carry their own separate dimensional-weight ceiling as part of qualifying for the tier at all — Small parcel requires unit weight ≤3.90 kg and dimensional weight ≤2.10 kg. A large, light box can be physically small enough for Small parcel and still get bumped to Standard parcel purely because its volume divided by 5,000 pushes the dimensional weight over that second ceiling.
The worked example below is deliberately chosen to show this: the item weighs 300 g on the scale but is billed at a heavier figure because of its dimensional weight.
What is the minimum referral fee, and is it different for heavy items?
£0.25 per item in most categories. Two categories carry a higher minimum specifically because of weight and size rather than price: Heavy Oversize items (unit weight over 23 kg, up to 31.5 kg) carry a £20 minimum referral fee, and Heavy Bulky items — over 31.5 kg, or with a longest side over 175 cm, or girth over 360 cm — carry a £25 minimum. Both are well above the standard £0.25 floor and are easy to miss when pricing a large item.
Is the Professional plan worth £25 a month?
It pays for itself sooner than in the US. The Individual plan charges £0.75 per item sold with no monthly fee, so the two cost the same at £25 ÷ £0.75 ≈ 33 units a month — versus roughly 40 units for the US Professional plan at $39.99 against a $0.99 per-item Individual fee. Below about 33 units a month, Individual is cheaper in the UK; above it, Professional is, and it's also required for advertising and Buy Box eligibility.
Does the calculator include VAT?
No, deliberately. Amazon states its own Professional plan and fulfilment fees exclusive of VAT, and what a seller actually owes depends on VAT registration status, where the seller and the goods are established, and whether Amazon or the seller is the deemed supplier under UK marketplace facilitator rules — none of which a generic fee calculator can know. Every price in this tool is the same pre-VAT figure Amazon itself quotes. If you are VAT-registered, the VAT on Amazon's own fees is normally reclaimable; if you are not, budget for it as a real cost on top of what this calculator shows.
Why is my actual Amazon UK fee higher than this calculator says?
Beyond VAT, three things sit outside this estimate:
- The fuel and logistics surcharge. Amazon has announced a 1.5% surcharge across UK and EU fulfilment fees from 17 April 2026. It is not yet folded into the rate data below — check your seller account for whether it has taken effect.
- The lithium battery / dangerous goods fee. A flat £0.10 per unit, ticked separately in the calculator above.
- Low-inventory-level and aged-inventory surcharges, the same mechanism as the US version of this tool.
If none of those apply and the gap is still there, the usual culprit is the same as in the US: dimensional weight pushing the item into a heavier billing weight than the number on the scale.
Where these numbers come from
Rates last checked against the sources below on .
Rate schedule version 2026.2, effective .
- Amazon — Sell on Amazon UK pricing retrieved 2026-08-03
- Amazon UK — FBA Rate Card (PDF, effective 1 July 2026) retrieved 2026-08-03
- Amazon — Sell on Amazon UK pricing (2026 European fee reductions) retrieved 2026-08-21