Cinemetrics is a free Chrome add-on developed by blwetze that allows users to calculate the average shot lengths for films. With the "Frame Accurate Cinemetrics Tool" (FACT), users can accurately capture and edit shot delimiters for a film on their computer. Alternatively, the "classic" tool can be used to mark shots while watching a video that is not on the user's computer.

Cinemetrics provides a valuable tool for film enthusiasts, researchers, and students who want to analyze and compare shot lengths in different films. By accurately marking shot delimiters, users can calculate the average shot length and gain insights into the pacing and rhythm of a film. The add-on is easy to use and provides a straightforward interface for marking shots.

Overall, Cinemetrics is a useful tool for anyone interested in studying the art of film and understanding the impact of shot lengths on storytelling. Its availability as a Chrome add-on makes it easily accessible to a wide range of users.