ROAS Calculator
ROAS calculator works out CPM (cost per 1,000 impressions) and CPC (cost per click) from Conversions, Attributed revenue and Ad spend behind that revenue. The default figures on this page give ROAS of 5.0000; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
2 steps
- ROAS = revenue / spend = 500 / 100 = 5 (500%)
- ROI = (revenue - spend) / spend x 100 = 400%
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
1 source
Keep this result
Save it, change one figure, then compare the two
The calculation stays free. Save this scenario, adjust one assumption, save that too, and put them side by side to see exactly what the change costs you. A free account keeps 5 scenarios and 2 comparisons; Personal makes both unlimited and adds exports and private links. Nothing is saved unless you press Save.
What the roas calculator calculates
Computes advertising cost per thousand impressions, cost per click, click-through rate, cost per acquisition, conversion rate, return on ad spend and ROI from campaign cost, impressions, clicks, conversions and attributed revenue.
How to use this roas calculator
Enter Conversions, Attributed revenue and Ad spend behind that revenue. CPM (cost per 1,000 impressions) updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind CPM (cost per 1,000 impressions), CPC (cost per click) and CTR.
The method follows Interactive Advertising Bureau / MRC, Digital Audience-Based Measurement Standard.
What you can compare
Change one input at a time to see how it affects CPM (cost per 1,000 impressions), CPC (cost per click) and CTR. The inputs you can vary are Conversions, Attributed revenue and Ad spend behind that revenue.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How is roas calculated?
Computes advertising cost per thousand impressions, cost per click, click-through rate, cost per acquisition, conversion rate, return on ad spend and ROI from campaign cost, impressions, clicks. Open “How this is worked out” beside the result to see each step for your own figures.
Is a 2.5 roas good?
Computes advertising cost per thousand impressions, cost per click, click-through rate, cost per acquisition, conversion rate, return on ad spend and ROI from campaign cost, impressions, clicks. Put your own figures in above and the working updates beside the result. For scale, the default figures on this page give 5.0000.
What roas is 25% ACoS?
Computes advertising cost per thousand impressions, cost per click, click-through rate, cost per acquisition, conversion rate, return on ad spend and ROI from campaign cost, impressions, clicks. On this page it is computed from Conversions, Attributed revenue and Ad spend behind that revenue and shown as CPM (cost per 1,000 impressions), CPC (cost per click) and CTR.
What does 4:1 roas mean?
It needs Conversions, Attributed revenue and Ad spend behind that revenue. Nothing else is required, and the figures stay in your browser.
What information do I need for the roas calculator?
You need Conversions, Attributed revenue and Ad spend behind that revenue. The page opens with default figures that give ROAS of 5.0000, so you can see the scale before entering your own.
What does this roas calculator show?
It shows CPM (cost per 1,000 impressions), CPC (cost per click), CTR, CPA (cost per conversion), Conversion rate, Cost per single impression, ROAS and ROAS as a percentage, with the working and any warnings for your entries.