The weight of a sailfish varies depending on the species and the individual fish. On average, sailfish weigh between 20 and 150 pounds (9 and 68 kilograms). However, some sailfish have been known to weigh up to 220 pounds (100 kilograms). The heaviest sailfish ever caught on record weighed 225 pounds (102 kilograms) and was caught in the Gulf of Mexico in 1975.