Trivia: About how much blood is in an adult human?
3 cups
1.5 gallons
100 cups
60 gallons
The correct answer is 1.5 gallons
So why is this answer correct? : The average adult carries about 1.2 to 1.5 gallons of blood, which translates to about 10 units. Blood makes up around 10% of an adult’s total body weight, and the amount of blood a person has corresponds directly to their size — the bigger the body, the more blood it contains. A newborn baby, for example, carries far less blood — around 1 cup.