CPM, CPC & CTR Calculator
Drop in the numbers from any ad report and get every core metric at once — CPM, CPC, CTR, cost per conversion and conversion rate. Fill in what you have; the rest fills itself in.
The formulas, in plain terms
- CTR = clicks ÷ impressions — how compelling your ad is to the people who see it.
- CPC = spend ÷ clicks — what each visit costs you.
- CPM = (spend ÷ impressions) × 1,000 — what reaching a thousand people costs.
- Conversion rate = conversions ÷ clicks, and CPA = spend ÷ conversions — how efficiently clicks turn into customers.
Read them together: a low CPC with a weak conversion rate still means an expensive customer. The leverage is usually in the landing page and targeting, not just the bid.
Which metric should you actually chase?
It depends on the job the campaign is doing. For brand awareness, CPM is your efficiency number — you're buying reach. For testing creative or driving traffic, watch CTR and CPC. For anything tied to revenue, CPA and conversion rate are the only metrics that matter, and a dirt-cheap CPC means nothing if those clicks never convert. Pick the one metric that maps to your goal, optimize for it, and treat the rest as diagnostics.
Promoto.io
Stop hand-tuning ad campaigns. Promoto writes, launches, and manages your Google, Meta & LinkedIn ads on autopilot.
Frequently asked questions
What is CPM?
CPM (cost per mille) is the cost of 1,000 ad impressions. It's calculated as spend divided by impressions, multiplied by 1,000.
What is the difference between CPC and CPM?
CPC (cost per click) is what you pay per click — spend divided by clicks. CPM is what you pay per thousand impressions. CPC measures the cost of engagement; CPM measures the cost of reach.
What is a good CTR?
Click-through rate varies by channel. Google Search ads often see 3–5%+, while display and social ads are typically well under 1%. Compare against your own history and your industry, not a universal number.