Conversion Lift
A measurement methodology that uses test/control groups to determine the true incremental impact of advertising on conversions.
What Conversion Lift means
Conversion lift (also called incrementality testing) is a measurement methodology that uses randomized test and control groups to determine how many conversions were truly caused by advertising versus those that would have happened organically. A treatment group sees ads while a holdout group doesn't, and the difference in conversion rates represents the lift attributable to advertising. Conversion lift studies have become more valuable as privacy changes make traditional attribution less reliable. Meta, Google, and other platforms offer built-in lift study tools. From a compliance perspective, conversion lift studies process personal data (group assignment and tracking) and require proper consent. The methodology is considered more privacy-friendly than granular user-level tracking because results are reported at the aggregate level. Lift studies also help validate that advertising claims about effectiveness are substantiated.
Related terms
Attribution
The process of determining which ads and touchpoints contributed to a conversion, used for optimizing ad spend allocation.
Conversion
A desired action completed by a user after interacting with an ad, such as a purchase, sign-up, or download.
A/B Testing
A method of comparing two versions of an ad or landing page to determine which performs better.
Return on Ad Spend
The revenue generated for every dollar spent on advertising, calculated as revenue divided by ad spend.