What Is Conversion Rate? — Free Tool
Conversion rate is conversions divided by the population that could have converted. The formula, why the denominator choice changes everything, and how attribution windows inflate it.
The share of people who completed the action you defined as valuable, such as a purchase or sign-up, out of those who had the chance to. Define the action before you measure the rate.
What it is
Conversion rate is the share of people who did the thing you wanted out of the people who could have. The thing has to be defined first: a purchase, a sign-up, a demo request, a download. Change the definition and the number changes with it.
How it is measured
Conversions divided by the eligible population, times 100. Sixty sign-ups from three thousand sessions is 2 percent. The denominator is a choice: sessions, unique users, or ad clicks. A user-based rate is always higher than a session-based one because the same person may visit five times before buying.
Commonly misunderstood
Two systems will rarely agree on this number, and that is not a bug. Ad platforms credit a conversion to an ad inside an attribution window, often including view-through credit, and log it on the impression date. Web analytics usually credits the last non-direct click and logs it on the conversion date. Widen the window from 1-day click to 7-day click plus 1-day view and reported conversion rate rises without a single extra sale. The other frequent error is reading a rate off a tiny sample: below roughly 50 conversions, the figure moves several points on chance alone, so early A/B test winners are usually noise.
When it matters
Conversion rate is the number to fix before spending more on traffic. Doubling the rate is almost always cheaper than doubling the budget, and a weak rate paired with a strong CTR usually points at the landing page rather than the ad.
Related terms
Features
- The conversion rate formula written out, with a worked example
- Sessions, users or clicks as the denominator, and what each one answers
- How attribution windows and view-through credit inflate the reported rate
- Why a small sample makes a conversion rate look meaningful when it is not
- A linked calculator for conversion rate and the revenue it implies
Frequently asked questions
What is the conversion rate formula?
Conversions divided by the eligible population, times 100. Sixty sign-ups from three thousand sessions is 60 / 3000 x 100 = 2 percent.
Should the denominator be sessions, users or clicks?
It depends on the question. Sessions answers how often a visit converts, users answers how many people eventually convert, and ad clicks answers how efficient a campaign is. Users-based rates are always higher than session-based ones because one person can visit several times.
Why do my ad platform and my analytics disagree?
Because they attribute differently. Meta credits conversions to an ad within its attribution window, including view-through, and counts them on the day of the impression. Google Analytics typically uses last non-direct click and counts on the day of conversion. Both are internally consistent and neither is wrong.
What is a good conversion rate?
For ecommerce, roughly 1 to 3 percent of sessions is typical, with 4 percent and above strong. Lead forms and free trials run much higher, often 10 to 25 percent, because the commitment is smaller. Compare against your own history first.
How much traffic do I need before the number means anything?
Enough conversions, not enough traffic. Below about 50 conversions in the period, the rate swings wildly on chance alone. Wait for volume before declaring a winner in a test.
