Multiple choice general knowledge science & technology Total volume of blood in a normal adult human being is ..... 5-6 litres 3-4 litres 8-10 litres 10-12 litres Reveal answer Fill a bubble to check yourself A Correct answer Explanation An average adult human has approximately 5-6 liters of blood, roughly 7% of body weight. This volume varies with size, gender, and health status. 3-4 liters is too low, while 8-12 liters is impossibly high.