what is the normal volume of blood in the body?
The average adult has about 1.2 to 1.5 gallons (4.5 to 5.5 liters) of blood circulating inside their body, said Dr. Daniel Landau, a hematologist and oncologist at the University of Florida Cancer Center – Orlando Health. By the time they're 5 or 6 years old, children have about the same amount of blood as adults do.