Profit calculator

One product, every channel

Enter the size, weight, price and costs once. See selling fees, fulfilment and VAT break down into net profit and margin for Amazon FBA, FBM, Shopify (MCF) and TikTok side by side.

Saved

Examples

Product

Look up by ASIN

Dimensions (cm)

Longest side is detected automatically.

Unit weight

Units per order

MCF ship speed

Volumetric weight 300 g · parcels bill on the greater of actual and volumetric.

Pricing & costs

Sale price (inc VAT)?The price the customer pays, VAT included. We strip the VAT to work in net terms.

Cost of goods (ex VAT)?Your unit cost excluding VAT. Pre-filled at 25% of the sale price on lookup — replace with your real cost.

Amazon category (referral fee)?Amazon's referral fee is a % of the sale price and varies by category. Some categories drop under £10 (e.g. Grocery to 5%).

Other cost (ex VAT)

VAT registered?When on, output VAT is removed from the sale price. Auto-set off on lookup for zero-rated categories (food, books). Override to match your product.

Storage in profit?When on, one month of FBA storage for this product is deducted per unit sold on the Amazon-held channels (FBA, Shopify & TikTok merchant).

Storage estimate?Monthly FBA storage to hold this many units of the current product, by its size. Standard-size rate £0.76/ft³ (Jan–Sep), £1.51 (Oct–Dec).

units / mo

£2.01 Jan–Sep · £4.00 Oct–Dec

Cards

Amazon FBA

Fulfilled by Amazon

Extra-large envelope

Sale price (inc VAT): £24.99
VAT (20%): −£4.16
Referral (15.0%): −£3.75
Fulfilment (FBA): −£2.94
Digital Services Fee (2%): −£0.13
Cost of goods: −£6.00

Net profit£8.01

Net margin32.0%

Amazon FBM

Merchant fulfilled

Your postage (ex VAT)

Sale price (inc VAT): £24.99
VAT (20%): −£4.16
Referral (15.0%): −£3.75
Digital Services Fee (2%): −£0.08
Your postage: −£3.50
Cost of goods: −£6.00

Net profit£7.49

Net margin30.0%

12-month projection

Net profit per unit ramped by monthly growth.

Channel

Units / mo?Starting monthly volume. Seeded from Keepa's 'bought in past month' when you look up an ASIN — a recent snapshot, so it won't capture seasonal swings.

Growth

Overhead / mo

Profit / unit (Amazon FBA)

£8.01

12-mo revenue

£39,809.07

12-mo net profit

£12,751.97

Month	Units	Revenue	Net profit	Cumulative
1	100	£2,499.00	£800.50	£800.50
2	105	£2,623.95	£840.53	£1,641.03
3	110	£2,748.90	£880.55	£2,521.58
4	116	£2,898.84	£928.58	£3,450.16
5	122	£3,048.78	£976.61	£4,426.77
6	128	£3,198.72	£1,024.64	£5,451.41
7	134	£3,348.66	£1,072.67	£6,524.08
8	141	£3,523.59	£1,128.71	£7,652.78
9	148	£3,698.52	£1,184.74	£8,837.52
10	155	£3,873.45	£1,240.78	£10,078.30
11	163	£4,073.37	£1,304.82	£11,383.11
12	171	£4,273.29	£1,368.86	£12,751.97

Uses the regular price (£24.99) and Amazon FBAnet profit per unit. Starting volume seeds from Keepa's recent monthly sales on lookup; seasonality isn't modelled, so adjust the start and growth to taste. Storage, if on, is counted per unit sold.

Per-unit figures. Excludes optional prep/returns services; monthly storage is an optional toggle (1-month estimate, standard-size rate). FBA applies Low-Price FBA rates automatically when the item is at or under the category threshold (£10 or £20). MCF rates as of 29 May 2026; FBA referral & fulfilment rates as of 1 February 2026. TikTok commission is an editable assumption (default 9%). Confirm against live statements before relying on these numbers.