Methods, apparatus, and articles of manufacture to measure search results are disclosed. A disclosed example method to determine an order for search results in response to a search query includes determining a first preview metric and a second preview metric for a first search result and a second search result corresponding to a search query from a requester, the first preview metric including a first ratio based on a first count of preview events for the first search result and a second count of search result impressions in the first search result, the second preview metric including a second ratio based on a third count of preview events for the second search result and a fourth count of search result impressions in the second search result; ordering the first and second search results based on the first and second preview metrics; and sending a response to the requester instructing a web browser of the requester to display the ordered search results.