Quick answer
A call to action (CTA) is a prompt, usually a button or link, that tells a visitor what to do next, such as start a trial, buy, book a demo or subscribe.
Formula: CTA click-through rate = CTA clicks ÷ page or section views × 100
What does call to action mean?
A call to action (CTA) is a prompt that tells a visitor what to do next: "Start free trial", "Add to cart", "Book a demo", "Download the checklist", "Subscribe". On websites and apps it is usually a button or link; in emails and ads it can be a button or a line of text. A good CTA makes the next step obvious, specific and worth taking.
Every page should have one primary call to action that matches the page's purpose, and at most one or two secondary ones for visitors who are not ready.
Types of calls to action
| Type | Purpose | Example |
|---|---|---|
| Primary conversion | The page's main goal | "Start free trial", "Buy now" |
| Lead generation | Capture contact details | "Get the template", "Book a demo" |
| Lower-commitment | For visitors still researching | "See how it works", "Read the guide" |
| Navigation | Move to the next relevant page | "Compare plans", "Next: set up tracking" |
| Social / sharing | Spread the content | "Share", "Invite a teammate" |
| Re-engagement | Bring users back | "Continue where you left off" |
What makes a call to action effective
- Specific outcome. "Get my free report" beats "Submit".
- Matches intent. A reader of a beginner guide needs a different CTA from a visitor on the pricing page.
- Visible and clickable. Distinct styling, enough contrast, a tap target large enough on mobile (WCAG 2.2 sets a minimum of 24×24 CSS pixels).
- Placed where the decision happens. After the content that justifies it, not only at the bottom of a long page.
- Reduces risk. Nearby notes like "No card required" or "Cancel anytime" answer the main objection.
- One primary per section. Several competing buttons split attention.
How to measure CTA performance
CTA click-through rate = clicks on the CTA ÷ views of the page or section × 100
Click-through alone is not success. Track what happens after the click: did the visitor complete the form, sign-up or purchase? A CTA that gets many clicks but leads to a confusing form performs worse than one with fewer, better-qualified clicks.
Worked example
A guide page (sample data) gets 8,000 views a month. A single CTA at the bottom, "Sign up", gets 80 clicks (1.0%) and 24 sign-ups. Adding a contextual CTA after the section on reporting, "Try the report template free", gets 260 clicks (3.3%) and 70 sign-ups. Total sign-ups from the page rose from 24 to about 90 a month.
Tracking calls to action in TapCub
Track button clicks (autocapture records clicks on buttons and links), view clicks on click heatmaps, and set the downstream action as a goal so you can follow CTA clicks to conversions in a funnel.
Related terms: conversion rate optimization, website conversion, micro-conversions, landing page conversion rate.
Sources
- Nielsen Norman Group. Better link labels: 4Ss for encouraging clicks.
- W3C. WCAG 2.2: target size (minimum).
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Growth Strategist
Explores acquisition channels, activation, and conversion experiments, turning data insights into actionable growth hypotheses and evaluation methods.