How to Test Different Calls to Action to Improve Conversions
Testing calls to action means showing different versions to different visitors and measuring which one produces more inquiries. It replaces opinion with evidence. Small changes to wording, colour or placement can shift results noticeably, but you will only know which ones help by testing them properly.
What A/B testing is
An A/B test splits your visitors randomly between two versions of a page: the original (A) and a variation (B) that differs in one element. You then compare how many people in each group completed the action you care about, such as submitting a form or clicking to call. A multivariate test changes several elements at once, but it needs far more traffic, so most small businesses should stick to simple A/B tests.
Start with a hypothesis
Do not change things at random. Write a short statement of what you will change, why, and what you expect:
“Changing the button from ‘Contact Us’ to ‘Get My Free Quote’ will increase form submissions, because it states the benefit and what happens next.”
A hypothesis keeps the test focused and teaches you something even when it fails.
Pick one goal metric
Decide in advance what counts as success. Common choices are click-through rate on the button, form completions, phone call clicks or booked appointments. Use the metric closest to real business value. A button that gets more clicks but fewer completed inquiries is not a win.
What to test
Consider testing these elements, one at a time:
- Wording: “Request a Quote” versus “Get My Free Quote”
- Benefit statements: adding “No obligation” or “Reply in 24 hours”
- First person versus second person: “Get My Quote” versus “Get Your Quote”
- Colour and contrast: how strongly the button stands out
- Size and shape: larger or smaller buttons, with or without icons
- Position: above the fold, after benefits, in a sticky bar
- Surrounding text: reassurance lines, urgency or proof beside the button
- Type of action: form versus call versus WhatsApp
Start with high-impact items on high-traffic pages, such as your homepage and top service pages. Wording and offer clarity usually matter more than small colour tweaks.
Change only one thing at a time
If you change the wording, colour and position together and results improve, you will not know which change mattered. Isolate variables so you can learn and build on each result.
Get enough traffic and run long enough
Tests need enough visitors to be reliable. A handful of clicks can produce misleading differences by chance. Use an online sample size calculator to estimate how many visitors you need, based on your current conversion rate and the improvement you hope to detect. Run the test for at least one or two full weeks, to cover weekday and weekend behaviour, and avoid stopping early just because one version seems ahead.
Low traffic? Test big changes
If your site has little traffic, small differences will not be measurable. Test bigger changes, such as a completely different offer, or rely on before-and-after comparisons and qualitative feedback like call notes and customer comments.
Use the right tools
Options include built-in testing features in your website platform or landing page builder, as well as dedicated experimentation tools. Check that the tool does not slow your site or cause flickering. Pair testing with analytics, heatmaps and session recordings to understand why a version won.
Read results carefully
Look at statistical significance, which indicates how likely a difference is due to chance. Many tools report a confidence level; 95 per cent is a common threshold. Also consider practical significance: a tiny gain may not justify extra work. Check lead quality, not just quantity, and segment results by device and traffic source, since mobile and desktop visitors can behave differently.
Document and apply what you learn
Keep a simple log of each test: hypothesis, dates, versions, results and decision. Roll out winners, and use findings to inform your next idea. If a test shows no difference, that is still useful, because it tells you where not to spend time.
Avoid common mistakes
- Ending tests too early
- Testing too many things at once
- Changing the page during the test
- Ignoring seasonal effects or campaigns running at the same time
- Judging only by clicks
Test one clear change at a time, measure real inquiries, run long enough and record what you learn. Over time, steady improvements can add up to a meaningful increase in conversions.