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What Is Conversion Rate Optimisation (CRO)?

Conversion rate optimisation is improving the share of visitors who take a desired action. Definition, method, benchmarks and public examples.

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Conversion Rate Optimisation

Conversion rate optimisation (CRO) is the practice of increasing the percentage of website or app visitors who take a desired action, such as buying, enquiring or signing up, through research, fixes and controlled testing.

How it works

CRO starts with research: analytics, session recordings, surveys and user testing show where people drop out and why. Clear problems get fixed. Uncertain ideas get A/B tested, with enough traffic and time to trust the result.

Conversion Rate Optimisation: open marketing guide with a chart, checklist and reading time

Public examples

Formula

Conversion rate = (conversions / visitors) x 100

See CRO services and the psychology of landing pages.

FAQ

How much traffic do we need for CRO?
For reliable A/B tests, usually a few thousand visitors a month to the pages being tested.
Is CRO just A/B testing?
No. Research and fixing obvious problems often deliver more than testing alone.
Published Sep 30, 2026 · Last updated Sep 30, 2026