How much CC blood does the human body have?

According to scientific determination, the blood volume of a normal person is about 8% of the body weight. If the body weight is 50 kg, the blood volume is about 4000 ml.

About 80% of human blood flows in the blood circulation system, and about 20% is stored in the "blood bank" of liver, spleen and lungs. Donating 200-400 ml of blood at a time only accounts for 5%- 10% of the whole body's blood volume. You can completely rely on your own compensation and hematopoietic capacity to mobilize the stored blood in time to replenish blood circulation without affecting your health.