fun fact, when humans die they weigh the same, theyre just harder to lift because their muscles arent holding them in place anymo9rte. lets say the average human is 150 pounds. there is 1.5 gallons of blood in a human body, which weighs about 12 pounds (rounded). draining all the blood from the body would make it 138 pounds. adults have about 8 pounds of skin on them. taking the skin off makes a body weigh 130 pounds. a head is 11 pounds, so simply chopping it off would make the body weigh 119 pounds. the average human intestines weigh 7.5 pounds, so removing those would make the body 111.5 pounds. this means that you could make a 150 pound dead body the weight of the average 12 year old.