Short answer
ROAS divides attributed revenue by advertising spend. At a 40% contribution margin, advertising break-even ROAS is 1 / 0.40 = 2.5. This is neither net profit nor proof that advertising caused all sales.
Key verification: Recalculate revenue, margin and spend on the same basis and separate unaccepted quotes.
Sources and limitationsA high ROAS can coexist with losses. Materials, travel and delivery can absorb most of a service business’s revenue. This guide provides a decision worksheet for interpreting advertising returns on a consistent economic basis, without choosing a universal target for every business.
Define the inputs to each calculation
Use confirmed sales in the chosen window and an explicit refund rule. Do not replace revenue with the value of every quote sent. Calculate contribution margin after variable service delivery costs and before the advertising expense under analysis. Keep tax treatment and currency consistent across every row.
Fictional case: revenue four times advertising spend
| Item | Amount or calculation |
|---|---|
| Attributed sales | 4000 EUR |
| Variable delivery costs | 2400 EUR |
| Advertising spend | 1000 EUR |
| Contribution before advertising | 1600 EUR |
| Contribution after advertising | 600 EUR |
ROAS is 4000 / 1000 = 4. The pre-advertising margin is 1600 / 4000 = 40%. Under that assumption, advertising break-even is 2.5. The remaining 600 EUR must still contribute to fixed expenses: it is not net profit. Return on the total modelled expense would be 600 / 3400, but only describes the costs included in this worksheet.
Check the threshold before changing budgets
Repeat the case using actual costs for each service family. If margin falls to 25%, break-even rises to 4; the same ROAS no longer contributes after advertising. Record assumptions, update date and sales still awaiting maturity. With zero or negative margin, the break-even formula does not provide a viable advertising target.
Using WhatConverts to support the record
WhatConverts documents spend, lead volume and commercial values. It may help collect worksheet inputs; verify that the recorded value represents sales rather than proposals. A manual worksheet is enough to rehearse the calculation. CallsIQ prepared this arithmetic example, rather than observing campaign results or testing the tool.
Sources and limitations
Documentary review: . Content type: Documentation-based guide with original exercise.
Sources describe terms and capabilities stated by their owners. Proposed protocols and fictional examples do not establish product tests performed by CallsIQ.
- spend, lead volume and commercial valueswww.whatconverts.com
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