The invention concerns a method for measuring a multicast stream audience, said multicast stream being capable of being replicated by collecting equipment towards user terminals subscribing to said multicast stream. Said method includes a step of transmitting, via at least one collecting equipment to a counting platform, and in accordance with a counting protocol, at least one counting message comprising at least one audience information concerning the replications of the multicast stream by said at least one collecting equipment to at least one user terminal.