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SEO & Marketing

ROAS Calculator

Calculate return on ad spend, contribution after advertising, and break-even ROAS.

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Transparent methodology

What the result includes—and what it does not

Reviewed SolveKit editorial review — campaign economics QA

Built for advertisers comparing attributed revenue with ad spend while accounting for gross margin.

Calculation method

  1. 1ROAS = revenue attributed to advertising ÷ advertising spend.
  2. 2Gross profit from attributed revenue = attributed revenue × entered gross margin.
  3. 3Contribution after advertising = gross profit from attributed revenue − advertising spend.
  4. 4Break-even ROAS = 1 ÷ gross margin expressed as a decimal.

Assumptions and limits

  • Attributed revenue and ad spend must cover the same date range, currency, account scope, and attribution settings.
  • Gross margin should reflect product or service delivery cost before advertising; overhead, tax, refunds, and incrementality are excluded.
  • Attribution is not proof of causation, and conversion lag can temporarily understate reported ROAS.

Worked example

$15,000 attributed revenue from $5,000 spend

Input: $5,000 ad spend, $15,000 attributed revenue, and 60% gross margin.

Output: 3.00× ROAS, $9,000 gross profit, $4,000 contribution after ads, and 1.67× break-even ROAS.

Primary sources

How to use it

Three steps. One clear answer.

  1. 1Enter or paste the values requested by the tool.
  2. 2Review the input units and choose any relevant options.
  3. 3Calculate, then copy or download the result you need.

Built for trust

Useful without the friction.

  • No registration or paywall before your result.
  • Responsive controls for phone, tablet, and desktop.
  • Clear assumptions and warnings where estimates have limits.

Frequently asked questions

How does the ROAS Calculator work?

ROAS = revenue attributed to advertising ÷ advertising spend. Gross profit from attributed revenue = attributed revenue × entered gross margin. Contribution after advertising = gross profit from attributed revenue − advertising spend. Break-even ROAS = 1 ÷ gross margin expressed as a decimal.

What should I check before using the result?

Attributed revenue and ad spend must cover the same date range, currency, account scope, and attribution settings. Gross margin should reflect product or service delivery cost before advertising; overhead, tax, refunds, and incrementality are excluded. Attribution is not proof of causation, and conversion lag can temporarily understate reported ROAS.

How current is this page?

The methodology and source notes were reviewed on 2026-07-24. Editable rates and inputs should still be checked against the provider or authority linked below.

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