How much Blood is in a Human Body in Liters?

The average amount of blood in a human body is about 5 liters for adults, which typically makes up about 7–8% of total body weight. The exact amount can vary based on factors such as age, sex, weight, and health conditions:

• Adult males generally have about 5.5 to 6 liters of blood.
• Adult females generally have about 4.3 to 5 liters of blood.
• Pregnant women may have up to 50% more blood than non-pregnant women to support fetal development.
• Children and infants have less blood, proportional to their body size— for example, an infant has about 75–100 milliliters per kilogram of body weight.

These values are averages and may differ from person to person depending on underlying health, altitude, and other factors.