What is this ad metrics calculator?
A free, browser-based calculator that turns your raw ad numbers — spend, revenue, clicks, impressions, and conversions — into the five core performance metrics every marketer reports on: ROAS, CPA, CPC, CTR, and CVR. Enter only what you have and the rest is computed live, with the exact formula shown beside each result. Everything runs locally in your browser, so your numbers are never uploaded.
The formulas
- ROAS = Revenue ÷ Spend (e.g. 3.0 means 300% return).
- CPA = Spend ÷ Conversions (cost per result).
- CPC = Spend ÷ Clicks (cost per click).
- CTR = Clicks ÷ Impressions (click-through rate).
- CVR = Conversions ÷ Clicks (conversion rate).
How to use it
- Enter the numbers you have from your ad platform on the left.
- Read the computed metrics on the right — each shows the formula used.
- Leave fields blank to skip a metric — only what can be derived is shown.
Common use cases
- Checking whether a campaign is profitable (ROAS) before scaling spend.
- Comparing CPA and CPC across channels to reallocate budget.
- Diagnosing whether low results come from CTR (ad) or CVR (landing page).