Method for processing slaughtered poultry, wherein oven-ready carcasses of slaughtered poultry are conveyed by a feed conveyor (2), said feed conveyor having an endless track and carriers (2a) that are moved along said track, the feed conveyor carrier being adapted to support one carcass suspended from its legs. Each individual carcass is subjected at least one of: ●—a determination of the individual carcass weight by a weighing device (4), ●—a determination of the individual carcass size by an imaging device. For dividing the carcasses into parts use is made of a first cut-up line (10) and a second cut-up line (20), wherein each cut-up line has an associated cut-up line conveyor (11, 21), said cut-up line conveyor having an endless track and carriers (11a, 21a) that are moved along said track, each cut-up line conveyor carrier being adapted to support one carcass suspended from its legs. Each cut-up line comprises one or more cutting devices (12, 22) arranged along the track, which one or more cutting devices divide a carcass supported by a cut-up line conveyor carrier into parts.