Methods and apparatus for transcoding metadata are disclosed. An example method disclosed herein to meter media content presented by a media consumption device comprises detecting at a metering device first metadata accompanying the media content presented by the media consumption device, receiving from a transcoder at the metering device second metadata associated with the media content presented by the media consumption device, the second metadata comprising third metadata that has been transcoded to form the second metadata, and processing the first metadata and the second metadata to meter the media content presented by the media consumption device.