A combination of the coaches' scores and audience voting determines the final four contestants on "The Voice," as of 2015. The audience votes on contestants after the performance show. On the results show, each coach assigns a percentage rating to the contestants on his team, with each percentage rating being added to the percentage of the audience that voted for a contestant.
The coach's vote is worth 100 percent and can be split however the coach wants between both contestants. For example, if the coach wants to leave the decision up to the audience vote, he assigns 50 percent to each contestant.
The final four is the only group that is chosen through this method. Contestants begin the series going through blind auditions, where they sing in front of a live audience and the coaches, with the coaches facing away from them. The coaches press a button if they want a contestant on their teams.
The next phase is battle rounds, where pairs of singers on the same team compete by singing the same song. Each coach chooses the winner from his team. After the battle rounds, the contestants perform live. The audience votes to determine who advances. The winner of the competition is chosen solely through audience voting.