Conversion rate is the percentage of people who complete a desired action after visiting a website, viewing an ad, opening an email, or using an app.
A conversion might be:
- Buying a product
- Submitting a lead form
- Signing up for a newsletter
- Booking a call
- Downloading a file
- Installing an app
- Starting a free trial
Conversion Rate Formula
[ \text{Conversion rate} = \frac{\text{Number of conversions}}{\text{Number of eligible visitors or interactions}} \times 100 ]
For example, if 50 people purchase after 1,000 website visits:
[ \frac{50}{1,000} \times 100 = 5% ]
The conversion rate is 5%. Google Ads uses the same basic calculation: conversions divided by eligible ad interactions during the same period.
Conversion Rate at a Glance
| Term | Meaning | Example |
|---|---|---|
| Conversion | A valuable action completed by a user | A purchase or form submission |
| Conversion rate | The percentage of users who convert | 5 purchases from 100 visitors = 5% |
| Conversion event | The action being measured | Checkout completed |
| Conversion funnel | The steps that lead to conversion | Ad → landing page → form → sale |
| Conversion rate optimisation | Improving the percentage of users who convert | Simplifying a checkout form |
What Counts as a Conversion?
A conversion is a user action that a business has defined as valuable. Common examples include purchases, sign-ups, phone calls, downloads, app installs, and in-app purchases.
The right conversion depends on the business goal:
- Ecommerce business: Completed purchase
- B2B company: Qualified lead or booked sales call
- SaaS company: Free trial registration or paid subscription
- Publisher: Newsletter subscription
- Mobile app: Installation or in-app purchase
- Local business: Phone call, direction request, or appointment
Define the conversion event before measuring conversion rate. Otherwise, one metric may combine actions with very different commercial value.
Types of Conversion Rate
The formula stays the same, but the denominator changes based on what you are measuring.
| Conversion Rate Type | Formula | Typical Use |
|---|---|---|
| Website conversion rate | Conversions ÷ website visitors or sessions | Measuring website performance |
| Ecommerce conversion rate | Orders ÷ website sessions | Measuring online store sales |
| Landing page conversion rate | Form submissions ÷ landing page visitors | Measuring lead generation |
| Ad conversion rate | Conversions ÷ ad interactions | Measuring advertising performance |
| Email conversion rate | Conversions ÷ delivered emails or clicks | Measuring email campaigns |
| App conversion rate | Installs or purchases ÷ relevant users | Measuring app performance |
For advertising, Google defines conversion rate as the average number of conversions generated from ad interactions. Google also lets advertisers measure actions such as purchases, sign-ups, and phone calls separately.
Conversion Rate Examples
Ecommerce Example
An online store receives 2,000 sessions and records 60 purchases:
[ \frac{60}{2,000} \times 100 = 3% ]
The ecommerce conversion rate is 3%.
Lead Generation Example
A service business receives 500 landing page visitors and records 25 form submissions:
[ \frac{25}{500} \times 100 = 5% ]
The landing page conversion rate is 5%.
Advertising Example
An ad receives 1,000 tracked interactions and produces 40 conversions:
[ \frac{40}{1,000} \times 100 = 4% ]
The ad conversion rate is 4%.
Conversion Rate Versus Related Marketing Metrics
Conversion Rate Versus Click-Through Rate
Click-through rate, or CTR, measures how many people click an ad, email, or search result. Conversion rate measures how many people complete the desired action after clicking or visiting.
A campaign can have a high CTR and a low conversion rate when the landing page, offer, or audience does not match the original message.
Conversion Rate Versus Bounce Rate
Bounce rate measures users who leave without taking further action. Conversion rate measures users who complete a defined goal.
A visitor may stay on a website without bouncing and still fail to complete a purchase or submit a form.
Conversion Rate Versus Cost per Conversion
Cost per conversion measures the amount spent to generate each conversion.
[ \text{Cost per conversion} = \frac{\text{Total marketing cost}}{\text{Number of conversions}} ]
Google defines average cost per action as the total conversion cost divided by the number of conversions.
A high conversion rate does not automatically mean a campaign is profitable. The conversion may have low value, or the acquisition cost may be too high.
Why Conversion Rate Matters
Conversion rate shows how efficiently traffic produces actions that matter to a business. It can help identify which campaigns, keywords, landing pages, products, or audiences contribute to business goals. Google recommends conversion tracking to connect advertising activity with purchases, sign-ups, calls, and other actions.
Businesses commonly use conversion rate to:
- Compare landing pages
- Evaluate advertising campaigns
- Find checkout or form problems
- Measure the effect of website changes
- Compare traffic sources
- Assess customer acquisition efficiency
How to Improve Conversion Rate
1. Track the Correct Conversion
Choose a conversion event that reflects a meaningful business outcome. A button click can provide useful information, but a completed purchase or qualified lead usually gives a clearer view of performance.
2. Match the Page to the User's Intent
An ad promising "red running shoes" should lead to a page showing relevant red running shoes, not a general footwear category.
Specific traffic often has clearer intent, but narrow targeting can reduce total traffic. Google identifies the balance between keyword specificity and available reach as an important advertising consideration.
3. Reduce Unnecessary Friction
Make the desired action easier to complete by:
- Removing unnecessary form fields
- Simplifying checkout
- Making the call to action clear
- Improving mobile usability
- Showing delivery, pricing, or eligibility details early
4. Strengthen Trust
Useful trust signals can include:
- Transparent pricing
- Customer reviews
- Security information
- Refund or cancellation terms
- Recognisable payment options
- Clear contact details
5. Test One Meaningful Change at a Time
Test changes to headlines, offers, page layouts, calls to action, forms, or checkout steps. Measure each change against the same conversion definition and a comparable audience.
6. Segment the Data
A single conversion rate can hide important differences. Compare performance by:
- Device
- Traffic source
- Campaign
- Landing page
- New versus returning visitor
- Product
- Geographic market
- Customer type
What Is a Good Conversion Rate?
There is no universal good conversion rate. The right comparison depends on the conversion being measured, traffic quality, industry, product price, customer intent, sales cycle, and attribution method.
A 2% purchase conversion rate may be strong for a high-priced product, while a 2% newsletter signup rate may be weak for a low-friction offer. Compare performance with your own historical data, similar traffic segments, and business outcomes instead of relying on a generic benchmark.
Important Conversion Rate Limitations
Conversion rate can be misleading when:
- The conversion definition changes
- Several conversion actions are combined
- One report uses visitors while another uses sessions
- Tracking is incomplete
- Conversions happen after the original visit or click
- Repeat purchases or multiple form submissions are counted differently
Google notes that conversion rates can exceed 100% in some advertising setups when more than one conversion is counted for a single interaction.
Bottom Line
Use conversion rate as a decision metric, not as a standalone score. Define the action clearly, keep the denominator consistent, segment the results, and connect conversion performance to revenue or qualified business outcomes.