What is the average adult blood volume per kilogram?

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What is the average adult blood volume per kilogram?

The amount of blood in an adult is commonly expressed as a per-kilogram value, and the standard figure is about 70 mL of blood per kilogram of body weight. This means a typical 70 kg adult has roughly 4.9 L of blood, close to 5 L, reflecting the idea that blood makes up about 7–8% of body weight. Values like 60, 80, or 90 mL/kg would imply noticeably different total volumes (for example, 60 mL/kg being about 4.2 L for a 60 kg person and 90 mL/kg about 6.3 L for a 70 kg person), so 70 mL/kg is the most consistent reference used in clinical practice.

The amount of blood in an adult is commonly expressed as a per-kilogram value, and the standard figure is about 70 mL of blood per kilogram of body weight. This means a typical 70 kg adult has roughly 4.9 L of blood, close to 5 L, reflecting the idea that blood makes up about 7–8% of body weight. Values like 60, 80, or 90 mL/kg would imply noticeably different total volumes (for example, 60 mL/kg being about 4.2 L for a 60 kg person and 90 mL/kg about 6.3 L for a 70 kg person), so 70 mL/kg is the most consistent reference used in clinical practice.

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