BACKLANE / TOOLS FOR SELLERS

ROAS calculator

What does each ad euro bring back?

Compare advertising spend with attributed revenue. Add your margin before advertising to see how the numbers fit together.

No sign-up · Calculated in your browser

01 / INPUT

Your inputs

English number format, for example 1,000.50. All monetary amounts are in EUR, excluding VAT.

Net ad spend

For your selected reporting period. EUR

Net attributed ad revenue

Use the same reporting period and attribution basis. EUR

Margin before advertising (optional)

Share of net revenue after other variable costs. Optional. %

02 / OUTPUT

Your result

Enter your figures and calculate the result.

ROAS is not profit. It does not cover fixed costs or establish which sales would have happened without advertising. ROAS is undefined at zero ad spend; ACoS is undefined at zero revenue. Without a positive margin before advertising, there is no finite break-even ROAS.

This tool processes your inputs locally in your browser. It does not upload your figures or files, or save them permanently.

Compare multiple campaigns from a CSV

Map a unique campaign ID, ad spend and ad revenue. Rows with the same ID are added together. Use comparable, non-overlapping data; do not mix total rows and detail rows.

Choose a CSV file

UTF-8, up to 2 MB, 2,000 records, 100 columns and 10,000 characters per field. The file stays on your device.

Number format in the file

Your target ROAS (multiple)

For example, enter 4 for 4.00× or 400%. Do not enter a percentage.

Unit of both money columns

Rows use the same currency, unit, VAT and attribution basis and comparable, non-overlapping periods. I am not mixing total and detail rows.

Your result

Choose a file or load the fictional example.

Does not assess full profit. ROAS is not calculable at zero ad spend. The check does not access accounts or change campaigns. Preview: first 100 campaigns; CSV includes all.

This tool processes your inputs locally in your browser. It does not upload your figures or files, or save them permanently.

03 / METHOD

How the calculation works

ROAS = attributed ad revenue ÷ ad spend

ACoS = ad spend ÷ ad revenue × 100. With a positive margin before advertising: break-even ROAS = 100 ÷ margin percentage. Contribution after advertising = revenue × margin before advertising − ad spend. Your margin must already account for all other variable costs.

An example to work through

Fictional example: €1,000 ad spend and €5,000 ad revenue give a ROAS of 5.00 and ACoS of 20%. With a 40% margin before advertising, break-even ROAS is 2.50 and contribution after advertising is €1,000.

CONTINUE WITH YOUR OWN MARKETPLACE DATA

Which of your OTTO campaigns fall below your target?

Ask your AI to read available campaign metrics, compare equal reporting periods and prioritise campaigns by ad spend. You choose your target ROAS.

Set up Backlane Connect marketplaces

Backlane connects your seller accounts to your AI assistant. Available data depends on the marketplace, connection and permissions.

BACKLANE / STARTER PROMPT

Review my available OTTO Ads campaigns for the last 30 complete days. Ask me for my target ROAS. Show ad spend, attributed revenue and ROAS, and rank campaigns below my target by ad spend. Check units and attribution. Flag missing data. Do not change campaigns or budgets.

Frequently asked questions

What is a good ROAS?

It depends on your costs and goals. With complete inputs, break-even ROAS covers the included variable costs. Fixed costs and profit require an additional buffer.

Can I use this for OTTO Ads?

Yes, with comparable figures from your OTTO reports. Use the same period, revenue definition and consistent net values. Backlane can then help analyse available metrics from your connected OTTO campaigns.