How CTR is calculated
Click-through rate is the share of impressions that become clicks:
CTR = (clicks / impressions) x 100
A worked example: an ad receives 250,000 impressions and 3,000 clicks. CTR is 3,000 / 250,000 x 100 = 1.2%.
CTR is mostly a creative and targeting signal. It tells you whether the ad catches the right person's attention and earns the tap. Because it moves quickly and needs little volume to read, it is the first metric most teams look at when they launch a new creative.
Why CTR matters for cost
On networks that price by impression, CTR sets your cost per click: CPC = (CPM / 1,000) / CTR. With a $5 CPM, a 1% CTR gives a $0.50 CPC, and a 2% CTR halves it to $0.25. If the click-to-install rate holds, cost per install halves too. Platforms also feed engagement into their auctions, so ads with stronger CTR often win cheaper impressions.
Where CTR misleads
A click is a promise, not a result. Three patterns show up again and again in app campaigns:
- Curiosity clicks. A provocative hook gets clicks from people who were never going to install. CTR rises, click-to-install rate falls.
- Mismatch. The ad promises something the store page or first screen does not deliver, so users bounce.
- Low-quality placements. Some inventory produces accidental taps or click spam, which inflates CTR without real intent.
The fix is to read CTR next to click-to-install rate, cost per install, and an early revenue or retention metric for the same creative.
Reading CTR with attribution data
Ad networks report impressions and clicks; your MMP reports what those clicks led to. Linkrunner attributes installs and in-app events to the campaign, ad set and creative, and the Creatives tab shows Meta creative metrics next to installs and revenue. That makes it easy to spot the creative with a modest CTR that delivers the best ROAS, which is usually the one worth scaling. For the cost side of the equation, see cost per install benchmarks.