Understanding ROAS
How we calculate. ROAS = attributed ad revenue ÷ ad spend (often shown as a multiple, e.g. 4.0x). See our methodology and accuracy policy .
Real-world scenario: A typical ROAS case uses attributed ad revenue 20000 and ad spend 5000. Enter the same figures below to reproduce the worked path.
What is ROAS?
A core paid-media efficiency metric. ROAS is not the same as profit ROI unless revenue is replaced with profit.
- Match attribution windows for revenue and spend
- 4.0x = 400% return framing—label which style you report
- Platform ROAS can differ from blended analytics ROAS
The Formula
Worked Example
Common Use Cases
- Campaign reviews: kill or scale ads
- Budget planning: target ROAS floors
- Channel compare: Meta vs Google efficiency
Pro Tips
- Use profit ROAS when margins are thin
- Exclude brand halo carefully
- Track incremental lift for true incrementality
| Scenario | When to use |
|---|---|
| Percent of a number | Finding a part of a whole (tax, tip, score) |
| Percent change | Comparing old vs new values |
Limitations: ROAS results are educational marketing planning aids—not guarantees of campaign performance. Platform definitions and attribution models vary.
Common mistakes
- Swapping part and whole: The denominator must be the full total, not a subset.
- Rounding too early: Carry extra decimal places through multi-step work before rounding the final percent.
- Mixing percent and decimal forms: Enter rates in the format the calculator labels expect.
When to use this calculator
- Use this page when your wording matches roas calculator and the form labels on screen.
- Use percent of a number for “what is X% of Y?” problems.
- Use number is what percent when you know part and whole and need the percent.
Still unsure about roas calculator? Start with the quick answer above, then open the linked calculator that matches your wording.
❓ Frequently Asked Questions
How do I use this roas calculator calculator?
For roas calculator, enter the values labeled on the form, then press Calculate. Compare the result to the worked example on this page.
What formula does this page use?
See the quick answer and formula box above for roas calculator—the same percentage calculator expression is applied to your inputs.
What if my result looks wrong?
When checking roas calculator, re-check part vs whole (or rate vs base), rounding, and whether percents were entered as 25 rather than 0.25 when the form expects percents.
Authoritative References
For advertising and analytics definitions, consult:
- Google Ads Help — CPC, CPM, conversion, and ROAS concepts
- IAB — digital advertising standards
- Google Analytics Help — conversion and engagement metrics