The short answer
ROAS divides attributed revenue by advertising spend. ROI compares a defined net return with a defined investment. A strong ROAS can coexist with a loss because the revenue ratio does not deduct product, service or operating costs.
State the denominator before comparing
| Metric | Formula used here | Question answered |
|---|---|---|
| ROAS | Attributed revenue ÷ ad spend | How much credited revenue per unit of media spend? |
| Campaign ROI in this example | (Revenue − all included campaign costs) ÷ all included campaign costs | How much net return relative to the costs included? |
ROI is used with different investment definitions. Some reports divide a net return by advertising spend alone. That is a different denominator from the all-in example here. Label the costs explicitly; do not compare two “ROI” percentages until their formulas match.
Follow one illustrative campaign
Assume $5,000 attributed revenue, $1,000 ad spend, $3,000 product and fulfillment costs, and $500 other campaign costs. ROAS = $5,000 ÷ $1,000 = 5×. Included total costs = $1,000 + $3,000 + $500 = $4,500. Net return on that scope = $5,000 − $4,500 = $500. Example ROI = $500 ÷ $4,500 × 100% ≈ 11.11%.
If product and fulfillment costs rise to $4,000, total costs become $5,500 and net return becomes −$500. ROAS stays 5× because revenue and ad spend did not change. ROI on the same all-in basis becomes −$500 ÷ $5,500 × 100% ≈ −9.09%.
Do not subtract one from ROAS and call it business ROI
At 5× ROAS, subtracting one produces 4, or 400%. This only removes the advertising cost relative to advertising spend. It ignores the other expenses in the example. It may describe an explicitly limited media-only calculation, but it is not the all-in profit result.
Choose the measure for the decision
- Use ROAS for a consistent view of attributed revenue efficiency.
- Use contribution after ads to see what remains after modeled variable costs and media.
- Use a clearly scoped profit or ROI calculation to evaluate the broader investment.
- Use a credible incremental measurement design to investigate what the advertising caused.
Make exclusions visible
List overhead, agency fees, creative production, refunds and other items included or excluded. Timing matters too: booked revenue and cash received are not always the same. An accurate division cannot compensate for an incomplete cost model or prove causal impact from attributed sales.
Next reading
Examples are illustrative, not client results or benchmarks. The calculations use the inputs shown; real-world decisions depend on your records and assumptions. Report a correction.