Scientists estimate that the volume of blood in a human body is approximately 7 percent of body weight, or 4.7 to 5.5 liters (1.2 to 1.5 gallons) of blood for an average adult body with a weight of 150 to 180 pounds.
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The amount of blood in your body is generally equivalent to 7% of your body weight. But this is an estimate because it can depend on your sex, where you live, and other factors.
How Much Blood Is in the Human Body? - Healthline
Blood cells are made in the bone marrow. The bone marrow is the soft, spongy material in the center of the bones. It produces about 95% of the body 's blood …
Facts About Blood | Johns Hopkins Medicine