How much blood do humans have?

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The average adult has about 1.2 to 1.5 gallons (4.5 to 5.7 liters) of blood circulating inside their body. To put this into perspective, a milk jug is one gallon, so an average adult has between one and one and a half milk jugs of blood.

Human blood smear
Zoomed in picture of a smear of human blood

The amount of blood in a human body can vary depending on factors such as sex, age, health, and oddly, where you live, etc. People who live at high altitudes can have about one-fourth of a gallon of extra blood compared to those who live at lower altitudes. Because the air at higher altitudes has less oxygen, these people need extra blood to deliver the needed amount of oxygen to their lungs.

By the time children are about six years old, they will have about the same amount of blood as adults do. However, because children are smaller, their muscles, bones, etc. don’t weigh as much, so their blood makes up a more significant percentage of their body weight than it does in adults.

INTERESTING FACTS
  1. There are about 150 billion red blood cells in one ounce of blood.
  2. The human body creates 17 million red blood cells each second. Under high-stress situations, the body can produce up to 7x that amount.
  3. All blood isn’t red. For example, leeches and earthworms have green blood.
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INTERESTING REFERENCES
  1. HealthLine.com – How Much Blood Is in the Human Body?
  2. MedicineNet – Blood, How Much Do We Have?
  3. CBCO – Blood Fun Facts

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