Labrador Retrievers typically grow up to 24 inches. Male Labradors are bigger than female Labradors. Generally, a non-overweight female Labrador will be between 21.5-23.5 inches and weigh between 55-70 pounds. A full-grown, non-overweight male Labrador will be 22.5-24 inches and weigh between 65-80 pounds. But diet can greatly impact how big a Lab can get.