Amazon ROAS, ACoS and TACoS calculator.

Keep advertising-attributed sales separate from total marketplace sales. Enter figures for a comparable reporting period and currency to calculate the ratios below.

What the numbers mean.

ROAS expresses advertising-attributed revenue as a multiple of ad spend. If the spend is £100 and attributed sales are £400, ROAS is 4.00×. ACoS expresses the same spend as a percentage of attributed sales; in that example it is 25.00%.

TACoS compares the entered advertising spend with total marketplace sales. If total sales are £1,000, the same £100 spend gives a TACoS of 10.00%. The total-sales-to-spend ratio would be 10.00×, but that is not the campaign’s advertising-attributed ROAS.

Use comparable reporting windows.

Check the date range, currency and sales definitions in your reports. Attribution timing and the distinction between ordered sales and advertising-attributed sales can affect comparisons. If your reports are not aligned, reconcile the figures before treating the ratios as a single account picture.

These calculations do not establish net profit. Product costs, marketplace fees, fulfilment, returns and other business costs need separate consideration. A higher ROAS alone does not prove that a product is more profitable.

Turn the review into a practical campaign brief.

Share your marketplace, catalogue size, budget priorities and the problem you want to solve. Scalix can scope campaign reviews, keyword targeting and ongoing optimisation alongside listing and creative support.

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Calculation references: Amazon Ads: ACoS and ROAS and return on ad spend.