Most businesses reach for more traffic when they want more leads. But if only a small share of your current visitors convert, you are leaving easy growth on the table. Conversion rate optimisation, or CRO, squeezes more results from the traffic you already pay for.
What is conversion rate optimisation?
Conversion rate optimisation is the practice of increasing the percentage of visitors who take a desired action — enquiring, calling or buying — without needing more traffic. It uses evidence, not guesswork: you study how people behave, form a theory, test a change, and keep what genuinely works.
Why is CRO the cheapest way to grow?
Doubling your conversion rate has the same effect as doubling your traffic, but the cost is fixed while the benefit scales across every channel. Given that research from Baymard Institute finds around 70% of online carts are abandoned, there is usually far more to gain from fixing leaks than from buying more visitors.
Find out where visitors drop off
CRO starts with evidence. Heatmaps, session recordings and funnel analysis reveal exactly where visitors hesitate, get confused or give up. Those friction points are your biggest opportunities — and many trace back to the kind of friction that good UX removes.
Test, do not guess
Once you know where the leaks are, test your fixes properly rather than trusting opinion. A/B testing — showing two versions to similar visitors and measuring which performs better — lets the data decide.
- 1Form a clear hypothesis about why a change should help
- 2Run an A/B test so the numbers, not opinions, decide
- 3Keep the winning version and build on it
- 4Document what you learn so insights compound over time
What should you actually test?
Focus on the elements most likely to move the needle:
- Headlines and the main promise above the fold
- Calls to action — wording, colour, placement and number
- Form length and the fields you truly need
- Trust signals such as reviews, guarantees and results
- Page speed, since a faster page often lifts conversions on its own
Speed and page structure matter more than most people expect — see how page speed affects conversions and which landing page mistakes to avoid.
Small lifts, big results
A modest improvement in conversion rate flows through to every channel you run, which is what makes conversion rate optimisation one of the highest-ROI investments a service business can make. The cost is fixed, but the benefit scales with all your traffic.
Frequently asked questions
What is a good conversion rate?
It varies widely by industry and traffic source, so the most useful benchmark is your own past performance. A steadily improving rate matters far more than hitting someone else average.
How is CRO different from SEO?
SEO brings more visitors to your site, while CRO turns more of the visitors you already have into enquiries. They work best together: CRO makes every hard-won visit worth more.
How much traffic do I need for CRO?
Enough to reach reliable results from a test, which usually means a few hundred conversions over a reasonable period. Lower-traffic sites can still improve through research, best practice and clear, focused changes.
Is CRO a one-off project or ongoing?
It is ongoing. Each test teaches you something about your customers, and those insights compound. The most successful businesses treat CRO as a continuous habit, not a single fix.