Net profit is computed from Amazon’s own financial records
Cirometre does not estimate profit: it reads the raw events from Amazon’s Finances service and files each one into a category. Referral fees, FBA fees, Amazon’s other deductions, promotions, ad spend and returns come off the sale; reimbursements are added back and reversed reimbursements are deducted again. What remains is the net profit for the period.
Revenue is not profit, and the gap is itemised
Amazon deducts several different charges from a single sale and they do not all land in the same report. The referral fee is in one place, FBA fees in another, the Digital Services Fee and closing fees in a third. A seller adding these up by hand either misses a line or counts one twice.
Cirometre merges those events into one calculation and writes every charge into its own category: net sales, returns, referral fees, FBA fees, other Amazon fees, promotions, ad spend, reimbursements and reimbursement reversals. Why a row left the profit it did can be explained from that breakdown.
Tax the marketplace collects never counts as profit
In many marketplaces Amazon collects and remits sales tax itself (marketplace facilitator). The money passes through your account and has no effect on you as a seller. Counting it inflates both revenue and cost, and the margin comes out wrong.
Cirometre keeps those lines separate and never mixes them into net profit. The same applies to tax on advertising and tax on shipping.
Currency is converted on the event’s own day
In a multi-marketplace account events arrive in their own currency — euros in Europe, pounds in the UK, dollars in the US. Converting them all at today’s rate would rewrite the past every morning.
Each event is converted at the rate of the day it happened, so a closed period stops moving. You pick the display currency; the underlying figures do not change.
Frequently asked questions
How is Amazon profit calculated?
Referral fees, FBA fees, Amazon’s other deductions, promotional discounts, ad spend and returns are deducted from the sale; FBA reimbursements are added and reimbursements Amazon later reverses are deducted again. After COGS and logistics costs, what remains is net profit.
Why don’t the figures match Amazon’s own reports exactly?
Amazon’s summary reports include sales tax; Cirometre excludes marketplace facilitator tax because it has no effect on the seller. The second difference is COGS — Amazon does not know it, you enter it.
How far back does the data go?
Sales and finance data goes back two years. Sponsored Ads data is limited to 95 days on Amazon’s side; there is no more to pull.