The metrics, in plain English
CTR (click-through rate) is clicks ÷ impressions — how compelling the ad is. CPM (cost per mille) is the cost per thousand impressions — how expensive it is to reach your audience. CPC (cost per click) is spend ÷ clicks. Conversion rate is conversions ÷ clicks (or ÷ landing-page views) — how well the click turns into an action.
They're linked: a higher CTR usually pulls CPC down, because the platform rewards engaging ads with cheaper distribution.
Why 'good' numbers vary so wildly
Published benchmarks scatter enormously because they blend industries, countries, objectives and funnel stages. A retargeting campaign to warm buyers and a cold prospecting campaign to a broad audience are not comparable, yet both show up in the same average.
Objective matters too: a link-click campaign, a lead campaign and a sales campaign optimise for different things and produce different CTRs and CPMs by design. Comparing across them is meaningless.
The only benchmark that reliably matters
Your own account, over time. Your historical numbers already control for your industry, audience, offer and country — everything external benchmarks can't. Track your CTR, CPM, CPC and conversion rate trend, and judge each new campaign against your own baseline.
A 'below industry average' CTR that's above your own baseline and improving is good news. An 'above average' CTR that's falling week over week is a fatigue warning.
How to react to each metric
- •Low CTR → a creative/hook or targeting problem. Test new angles before touching bids.
- •Rising CPM → audience saturation, seasonal auction pressure, or a shrinking audience. Refresh creative and widen the audience.
- •High CPC with decent CTR → CPM is the culprit; work on relevance and audience.
- •Good CTR but low conversion rate → the ad is writing a cheque the landing page can't cash. Fix message match and page speed.