ROAS Calculator — Return on Ad Spend & Break-Even

How to use

1. Enter the total ad spend for the campaign or period.
2. Enter the revenue attributed to that spend.
3. Enter your gross margin on the product or service sold.
4. Read ROAS, ACoS and the break-even multiple — then act on the verdict.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

A ROAS number without a margin attached is how campaigns that win on the dashboard quietly lose money in the bank. This calculator does two things at once: it computes return on ad spend the standard way (revenue ÷ ad spend) and ACoS (spend ÷ revenue), then it converts your gross margin into a break-even ROAS — the multiple you need just to stand still after paying for the product. A 4:1 ROAS is excellent at an 80% margin and a slow leak at 25%. You also get the net contribution in dollars and a reference table of break-even multiples from 20% to 80% margins, so you can sanity-check any agency report. The math runs entirely in your browser — enter numbers from your ad platform and judge for yourself.

FAQ

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